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(1)On. Some. Nerineid. Gastropoda. (PreliTrjnary. in. Japan. Report). By. Tokio. Introduction History. Seiji YtJI. and. 9. ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥..‥‥‥‥‥‥‥‥‥. of. studies. Geological. view. of of. Description. of. Conclusion. 10. .‥‥‥‥‥‥‥. 16. ‥‥‥‥‥‥‥‥‥‥‥..‥‥‥‥. elements. 19. ‥.‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥... 20. .‥‥‥‥‥‥.‥‥‥‥‥‥‥‥‥‥‥‥‥‥. notes and. localities. noteworthy. species. PaleoecologlCal Geological. some. classi丘cation. taxonomic. some. 10. ‥‥‥‥‥‥‥.‥‥‥‥‥‥‥‥‥‥‥‥‥.‥‥. olltline. Historical On. SIIIKAMA. 48. ‥‥‥.‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥. distributions. geograpbical. Nerineids. Japanese. of. 50 54. ‥‥‥‥‥‥.‥‥.‥‥∴‥‥‥‥‥‥‥‥‥‥‥.‥‥‥.. Literature. 55. ‥‥‥‥‥.....=‥.‥‥‥ー‥‥_`‥.__=ーーー_‥ー__▲_‥.. IntroductioA Since. 1890. uisurgis Takaoka-gun,. two. and. in Japan,. Hitherto. attempted.. species. Tbese. of. some. but. very. from. the. the. In the. summer. Torinosu. Sakawa. district. Abukuma. large. and. number. and. of. All. remain. material.. species. undescribed. of. the. Southwest. Nerinella becaus'e. Japan. and. in the. new. and. of. in. Jurassic. those and Northeast. species) Aptyxiella the. ten. and. ill preservation. Kyusbu.. central. discern. to. able. Mesozoic. forma-. formations. S6ma. in the. district. of the Cretaceous. Lower. of the. They. Japan.. (one. genera are. which. fossils. nerineids. were writers in Japanese. mountainland, discriminated and. (岳ixteen. many. the. Japan,. Nerinea. of. Jurasso-Cretaceous. of. nerineids. group. not. of biostratigraphy,. formation. occurring. species. Northeast. specimens. species. fossils,. these. the. Kitakami. twenty-four. article･ ever,. of. of Shikoku,. in the. the. of. collected. at. was. subspecies. the viewpoints 'of paleoenvironment. writer Sakamoto. found. been. this. of one. and. cf.. Togano-mura,. have. from. junior. the. limestone. mountainland,. formations a. 1967,. genera unrepOrted They also'studied. tions.. and. of the study. course. mally. of. eight. Torinosu,. study. species. Nerinea. reported. gastropods. systematic. signi丘cant. paleogeography, paleoecology biohermic areas. sedimentary In. nerineid. any are. recorded Nerinella. are. species. M. NEUMAYR and limestone at. Torinosu. the. Prefecture,. K6chi. localities. various. E. NAUMANN. when from. RoEMER. obtained new. some. of and. Nerinea, the. genus) in. reported. this how-. insufBcient.

(2) 10. T.. Tlle. SⅢIKAMA. S. YuI. and. help from Prof. Valuable suggestions and Takashi HATAI, Assist. HAMADA Kiyotaka CI‡INZEI and and University Mr. Toshiyuki YAMAGUCHI the Tokyo, Prof. Kotora HATAI, of of Dr. Masabumi MロRATA University Of Of T6boku and Dr. Hajime KuRASAWA Also the Geological Survey kinds of assistance they of Japan. enjoyed various were. Writers. glVen. Tetsuro. many. from. Prof.. Messrs.. Kimihiko. ToMIDA,. Tomoki. National. University,. laboratory these. OzAKI,. Tetsuto. Shigeo. AsAMI. KASE,. Mr.. and. the. MuRAYAMA,. Yukimitsu. ARAKI. Miss. Tomoko. TANABE. of. writers. of Yokohama. Kyushu their. express. University hearty. in to. thanks. people.. History Studies H.. Kumao. and. Kazushige. Here. works.. and丘eld. ETO,. YABE. of. sttldies. by Japanese paleontologist nerineids a Nerinella from Lower mentioned sp.. date. of. back. 1927. to. Cretaceous. when. conglomeratic. 人. the. from. sp.. Kyushu.. In. from. OfunatoIWan,. in. sandstone Nerinea. the he. 1934. Miyako. district, Iwate. of. Lower. Cretaceous. Island,. Kesennuma. formation Nerinea. described bed. Sandstone. Nerinea. rence. Prefecture.. Goshonoura also. Hiralga. the. Miyagi. Prefecture.. cf. rigida. rigida. NAGAO. sp.. Prefecture.. a review of made Nerinea naumanni of. and. Miyako. N. naumanni. in. the. 6shima S. AsAO. and. distinguished. and. ln. occur-. from. sp.. T. SuGIYAMA. sp.. group. the. Nerinella. and. In 1942. and. in western Nerinella. 6shima formation. RoEMER. cf. visurgis SuGIYAMA & AsAO. reported. area. Albian. to. (upper Hauterivian-Barremian) City, Miyagi. NAGAO. Ⅰ.SⅢⅠIDA mentioned. Nerinea. Nerinea. T.. Amakusa. In 1940. NAGAO,. 1930. of the Aptian. the. of. In. forms. two. SuGIYAMA. neumayrLI. &AsAO. After FuKADA. World from. FuKADA. also. Tsukinoura K.. limestone. the. mentioned in. occurrence. Ojika. Peninsula, and. Ammonite. This. in. huge. black. a. Nerinea. of. sp.. Lower. Hokkaido.. from. Nerinella. nerineid. Jurassic. In 1961 the. Y. ONUKI. Hauterivian. to. 人. Barremian MuRATA. Neocomian. Ofunato reported in the. group. in Iwate. Nerinea. sp.. occurrence. indicated. some. a. In. 1966. silici丘ed tuffat. K.. NAKAZAWA. horizon. a. a. and little. M.. above. ′＼. Omine. district,. Geologicaloutline Here. Prefecture.. from. at. bioherm.. of. Middle. the. from. sp.. bed. sized. limestone. Prefecture.. Miyagi. hidakaensis. Nerinea. reported. Aptian. the. of. (MATHERON). Nerinea. reported. FuKADA. central. carinata. formation MoRI. lC.,'53A.. district,. Toucasia. accompanies. and. Orbitolina Hidaka. S6shubetsu,. II, in. War. Iwate. of. some. localities where notable localities and of Japanese. in Text一点g.. 1.. The. Prefecture.. localities. localities. noteworthy many. nerineids. listed. in. reported. nerineids are. are. occur. at. the. close. cited.. this of. paper. this. The are. chapter..

(3) On. Jurossic. ■■. ll. in Japan. HーOKKJAI. Sediments. Tectonic. -ヽノ､. Gastropoda. Nerineid. sedimenls. Cretaceous. 卓X. Some. A. Line. /. p4y. ♂. O. ♂. N. NER. ZD. メ｢Hidak. Miyako. +. TX. NE. south Kitakami S^oma. ーS. Oil. 32＼. 口. D. ヽ＼ノ. ト..ゥ. ヽ. O U. ♂. Text一丘g.. Ⅰ. Hidaka. 0. Z. TE. 1.. N. Main. E. q_⊥凹O. localities. Japanese. of. km. nerineids.. district. According. (Aptian. formation. Sorachi-gawa. to. in the. and. of limestone. FuKADA. (1953), the thick Gault), distributed. FuKADA. to. Kanayama. into. formation. the. Subdivided. district,. intercalated. Ammonite. course. the. of. lenses. thin. with. five beds. following. the. Lower. lower. the. along is. the. of. complex. in. ascending. order:. 工). Thin. alternation. Ⅱ) Ⅱ) Ⅳ) Ⅴ). Silicious More. Limestone. coarse-grained. its. and. of erous. later. which. is. inter-. thick.. size);. numerous. containing is, foraminifer. that. hidakaensis. as. such. (FuKADA),. bioclastic. debris. Orbitolina,. coral. is. of and. etc.. district Lower. Cretaceous. Prefecture,. This. group. by. HANAI. According. distributed. group,. is famous. Japan,. by. along. the. the. Paci丘c. occurrence. of. coast num-. fossils.. was. studied (1953), OGINO. to as. Miyako. Northeast. welトpreserved. formations. 5-6m. of. Diozo♪tyxis. yields. biosparite,. in. algaトstromatorites,. lwate. ■sbale. silicious. sandstone.. (Ⅰ),which. of. (0.1-2mm. ⅠⅠ.Miyako. and. limestone. agglomerate.. bed. of mainly. composed. of. sandstone fossiliferous. cberty sandstone■. less greeni占h schalstein.. or. Schalstein. Tbe. lenses. bluisb･grey. Light. arenite. of丘ne-grained. two. with. calated. HANAI. follows,. et in. Brst. by. YABE. and. (1966, MS) and (1968), the Miyako. al.. ascending. order. :. et. (1913) in al. (1968).. group. is divided. YEtIARA. HANAI. detail,. into. and. four.

(4) 12. T.. Raga. formation. (40 m) (70m). formation. Tanohata. SEIKAMA. :. conglomerate.. ;. conglomerate, with. Aketo. formation. (80m)､;. formation. Nerinea found. in the. ture.. 1934), associated ⅠⅠⅠ.6shima. medium･grained. or. and. highly. s,叩dstone, intercalated. sandstone,. me-. with. mudstone.. sp.,. Tanobata-mura, in. many. with. sandstone. mudstone. by NAGAO (1934), are reported formation of th･e Hiraiga (upper part) on. sandstone. coast of Hiraiga, northern occur The two nerineids. the. to. Nerinella. and. calcareous. conglomeratic. sandstone.. well/sortedfine[ fossiliferous.. NAGAO. or. sandstone. and. 丘ne･grained ; muddy dium-grained sandstone. (30m). rigida. conglomeratic. cross-laminae,. muddy Ⅱiraiga. S. Yロ1. and. other. a. Shimo-be主-gun, horizon. certain. pelec,ypods,. Iwate. (Nerinea. gastropods,. Prefec-. of NAGAO,. zone. etc.. corals,. district. According. (1940),. SHIIDA. to. Lower. the. 6shima. Cretaceous. formation,. ′＼. distributed. on. Prefecture,. Northeast. descending. the. wing. Black. of. Black. shale. -Western Black. wing. Dark-colored. Dark. intercalated. cobbles. green. form. the. blV. beds,. on. in the. *. aI. thin. beds. sandstone. -. -. -. bV. --･-･------･-･---. limestone. beds, occur,. while. and. bIV-aII. -----･･--･･-. conglomerate. but. not. reported Nerinea shiidai. upper. Quoted. associate. part. from. of. with. occurrence. it.. SrIIIDA. (1940).. fossiliferous. most. YA玉E n.. many corals containing EGロCHI*, HAYAMI SHIMIZロ(1925),. and. sp.. 50-80cm. of is. formation of the. account. are. by. as. layers. aI. bII. -------. bI. bIV. aII and. aV. )=aIII. bIII=. aggregated. 6shima. VII-aIV,. containing. coral. reef･building. bVIII, bVI. shale--------.---.---.----.-----. etc,. 370m. aIII. nodules･･･････････････.････. impure. sandstone. molluscs. in. aIV. .-.-.-----.. shale. these. follows,. as. aII. with. limestone. of. Yellowish-brown. Black. shale. nodules･-･-･------･. calcareous. tuffaceous. many. Miyagi. syncline-. marly. Dark･colored. age. beds,. several. -･----------･----. calcareous. including. shale. City,. aV. breccia. shale and including. of limestone. Black. The. into. Kesennuma. syncline-. of. Sandstone,. and. is subdivided. black and sandstolle limestone-.---.-----------.------.. Black. (1966),. Island,. shale-----------･----------･---. Alternation. Of. Japan,. Osbima. of. :. order. -Eastern. coast. southern. PhaneroPtyxis. and thick or. molluscs as. at. few. a. n.. oshimensis horizon. of. bVI. sp.. and. corals. Upper. regarded of Paracrioceras. Hauterivian-Barremian ishiharai. (YABE. &. in. SHIMIZU).

(5) On. ⅠⅤ. S6ma. Nerineid. Jurassic in. tributed. a. Lower. to. narrow. in ascending. area. (1950). order. di'vided. The. Koyamada The. series)･. beds･. which. is 15-50m. fecture･. thick,. west. The. koikensis. Tbe. Koike. Tbe. and. belts,. divided. were. the. Sakawa. n.. Bactro-. sp.,. n.. sp., it is. When. sp.. koikensis. nobilis is aggregated. basis. the. on. (SIiIMIZU),along. belt. with. limestone forms. SuGIYAMA. collected Togano-mura,. of. occur-. of. stromatoporoids,. Torinosu. the. Mitoda. and. various. AsAO. six. Toishiyama. intercalated. (the. and latter. N･. a. the. Japan. presents. three. belts.. from. Callovian. Titbonian,. to. in ascending. order; Irezumizawa. shale. with. (50m). lenses. Tsuka-. (130m),. formations.. of the. naumanni neumayrl, N. sugiyamai i; of. limestone lenticular massive Takaoka-gun, K6chi Prefecture.. from. of. basin. (15 m),. Kambaradani. from. others,. so-called. scales.. naumanni, in 1942. ranging. and. this. Torinosu. formations,. many. cycle. orogenic of. belonging,. stratigrapbers YEⅡARA (1890), (1926),. (1956),. group. and. thickest,. is frequently of. Sbikoku,. by. studied. KIMURA. Mesozoic. the. of. following. Nerinea. been. in southern. (1885), HARADA. (1940-41),. Yatsuji (160-350m), sandstone (20m) and. formation. Yatsuji. Japan,. is the. the. basin has. NAロMANN. K口RATA. into. (40-70m),. Two. Ne,rinea. n.. sp. ; B.. n.. Presoma-. fukushimensis. Kimmeridgian. as. steigeri. as. Ka.iseki-yama,. Torinosu. Torinosu. by. such. viewpoints to KロRATA,. Kambaradani The. Nerinea. at. Fukushima. yields. oosparite,. elegans. cf.. of Southwest of. (1932),. According. dani. City,. limestone. layers. regarded. group. paleontologists. stratigrapbical. and. S6ma. M.. limestone.. the. black. a. abukumensis. yields. in. cycles. from. limestone.. the. of. their. district. KoBAYASHI. is. is. of. member, and. pelecypods.. Torinosu. The. biomicrite. limestone. OuterZone. tectonic. limestone. Heteroptygmαtis. and in. and. Sakawa. to the. the. part. and. middle. limestone biomicrite. Heteroptygmatis. sp.,. (Ryoseki. lower,. and. sedimentary. Cryptoplocus. and. Auracosphinctoides. of. bexacorals. Ⅴ.. sp･. n.. (160 m), Sugiyama (180 m), Tomi-. Koike. the. collected Tocbikubo,. formations. Cretaceous into. lower. dis-. formations.. Lower. with. is. trend.. following. shale Nakanosawa. oosparite. the. N-S. a. with. subdivided. in. district. Awazu. as. of. were. tahoto. biomicrite. Ptyxis nobilis. is. and it consists. where. n･. sp･. band. Koyamada. of. n･. regarded. is intercalated. on. now. Cossmannea. of. is. S6ma. the. (300 m), (120m),. (1965) observed丘ve. limestone,. Sp･,. composed. rence. 13. the. shale. is composed dominant. and is. fossils. subpyramidalis. with. Japan. into. (240 m),. Koyamada. bed. oosparite. 2km. N.. City. complex. formation. upper. R･ SⅢoJI. Nerineid. the. formation. The. alternation; EGロCHI and. H･. of S6ma. alternation. Nakanosawa. upper. n･. of. Hayarna'sandstone. :. (240 m), Tochikubo sandstone (400m) and. ensis. complex. west. Sandstone. Koike,. in. Cretaceous. zonal. MASATANI. sawa. Gastropoda. district. The. K･. Some. exposed. at. established the. writers). Kamimitsuki,.

(6) T.. 14. Dark. brown. one. belonging. specimen. horizon. K6chi. Togano-mura, which. colonies. is insufBcient preserved, Itieria japonica n. sp. from. in. fordian. sp,. Torinosu and. stone. the. M.. biomicruof. stromatoporoid. being. of such aff.. P.. Callovian. Upper. ammonoids bernensis. as. with Ox-. to. Horioceras. (LoRIOL),. Poculis-. sp.. in. upper. and. in. sea. the. on. exposed. Zone. the. lkm about north The limestone ture.. formation,. Japan,. Sodthwest. lower. corresponding 300m is about. lgo-misaki. at. 15km. is about. thick. and. Fossils. Lithology. -￡･-i;-;I.I.けl･/I.1''･':･･. Barren. ∠ゝ. Nerineahigoensis. ￣o-TIc---T1clク. D 白. N.sp.. 0占〉. く⊃. l∠ゝA. 二占. ∠ゝF∠11 △l△. 己トィ O. 良. Heteroptygmatisorienlais. ヽ. d. l. Phaneroptyxis8akamotoensis. ヽ ∼ ヽ. ムl△l L△1△. C. ヽ. lムL△. Hexacoral,Stromatoporoids. -ド. O. ムLムL lム]△. ≡ c6. A∠ゝ. ,.ヒ1 c5 ∽ h q〉. Pl a. (Plygmatisyabei). △1△l. O. lD[D `∋loJ 10Lo. Ztieriajaponica. 61oL loFo. B. Cryptoploeusp.halloides. o[oL Fol°. D. olol loo. Barren. A. I. Text一丘g.. 2,. lgo一皿isaki･. conglomeratic grained. sandstone. Generalized A:. the. thick. formations`. ど.･Tこ:L.･･-･て-I-:.t･､一-IFL-L亡･'･r･･:.. E. was to. limefrom the lenticular collected Tanoura-cho, Ashikita-gun, and of lgo-isaki, in PrefecCity, both Kumamoto Yatsusbiro. Futami,. lens. of. Prefecture. Kumamoto. question由ere coast. of. at. in. d㌢etail. The. Outer. the. fossils. nerineid. in. (1959). into. formation. Sakamoto. TAMロRA. is divided. at. upper. Shimomitsuki,. biolithitic. and. as. regarded. ProPerisPhinctes. Jurassic. group. The. in. hexacoral. of. at. quarry. found. was. from. collected. district. Upper by. studied. occurrence. Euaspidoceras. and. ⅤⅠ. Sakamoto The. of the. KoBAYASEI,. mitodaense. Phinctes. generally. because. age. was. this. is. formation. Yatsuji. small. aplCal part only the specimen, it is identification, specific well comparable Kyushu･ Sakamoto formation the central of. Although. size.. of mainly foraminト. shells･. limestone. a. many. with. Itieria. genus. Itieria sp･. numerous. for. The. pellets. at. is composed. nerineids. pelecypod. the. Prefecture･. contains boulder. to. pebble. thin. formation. Yatsuji. of the. these. aggregated. to. YuI. S.. and. yielding. highly contains and debris of algae and. pelsparite fers,丘ne. dite. limestone. SHIKAMA. Black. limestone and. lens section of limestone C: Middle Lower layer･. columnar B‥. sbale･ layer･. calcareous. D:. Upper. black. layer･. sbale･. E:. Medium. is. divided.

(7) On. three. and. is. layers.. into. The. higoensLIs. Ptygmatis layer. n.. orientalis. is. but. brownish-grey. colored. cean. japonica. n.. sp.. In the. horizon. the. of. localities. 1The. (Refer 1.. to. Upper. 2. mation. ･Loc.. of 1km. 3.. Loc.. 4.. 5.. Itieria. seen.. AuracosPhinctes in. intercalated late. to. Oxfordian. in. given. are. sp.. lower. tile. relation. stratigrapbic Futami. at. Sorachi. to the. and. following. the. YGfutsu-gun,. central. Aptian.. series; Iwate. Shimo･hei-gun,. 6mine. of. Hiraiga. Prefecture:. upper. of. for･. formation;. Osbima. Pre･. Iwate MoRIAI,. 1963) ; City,. Kesennuma. Island,. of the. part. Yonoshi,. Mine,. formations. Rikuzen10shima. of. to. Copper. Kamigo. and. Yokonuma. of. Middle. 6funato 6funato. of the. of. b:. Nerinella and sp. Nishidate, Suezaki-cho,. c:. Northern. sp.. sea. Barremian.. d:. 7.. Hauterivian. Koike. west. ture;. 8.. 1.5km. c:. Tochikubo,. a:. 1km. cho,. K6chi. part). ;. late. b:. Speci丘c. 1km. Tsukinoura. west. determination. Suezaki･cho,. ibid.. as. ibid.. Takonoura. ;. lsland,. of. Funa･. Hauterivian.. a.. formation;. Hij6chi. ;. formation;. :. the. of. south. Barre-. early. (INAI. ibid.;. Station,. of. early. horizon. same. Bajocian･ Prefec-. Kimmeridgian, as. a.. of. the. Togano-mura,. Yatsuji. Sakawa･. formation. (middle. Oxfordian.. Togano. of. 1940). ;. Fukushima. formation;. Kamimitsuki,. Torinosn･1imestone to. City,. Bay,. Omae. horizon.. same. Togano. TAKAIIASl-II,. S6ma. the. Takenoura,. of &. Nakanosawa. the. Koyamada,. of ibid.. northeast. north. horizon. some. Kashima-machi,. member. Prefecture;. Calloviam. the. formation. Koike,. of. limestone. b:. Prefecture; ; late. 1961). found.. was. Benten-jima. of :. MoRI,. her･e.. Nagaiso,. sp.. &. found.. was. coast. 1.5km. a:. found ibid.;. Iwate. OfunatoCity,. (ONUKI. group. Akasaki-cho,. sp.. Prefecture. Station,. were. of. Nerinella. Western. Miyagi. coast. Ozaki-misaki, Nerinea. mian: 6.. west. formation. early. *. coast. 1.5km. a:. Nerinea. Loc.. layer,. this. Shime-kapp･mura, the. of. ､ (Aozasa. Barremian.. Prefecture:. gawara. Loc.. in. sporadically. nerineids. Codia-. Aptian.. group;. group. sea. corals and layer is light. Barremian.. to. *Loc.. bed. (Kanayama-zawa). to. West. Miyagi. ･Loc.. Miyako. Kamihei. Hauterivian. JaparleSe. of. of Hiraiga,. coast. west. fecture:. marly. Ammonite. the. the. of. middle. containing. assigned. limestone. of S6shubetsu-gawa,. course. Northern. are. The. 1.). Lower. :. a. horizons. and･. Text-丘g.. Hokkaido Loc.. sp.. basis. the. in. of. formation lenses. formation. on. age. Diceras. of. age. are. sp.. ; limestone. Sakamoto. upper. n.. sp.,. other Hetero-. sp.. lowe･r. the. size;. Sakamoto. of the. n.. of. rudite. phalloides. horizon. yabei. biomicrudite,. to. arenite. by n.. fragments. limestone. arenaceous. mainly. Titbonian. Kimmeridgian. Loc,. The. coarse. uppermost. occurrence. 一ist:. nerineids.. of. foraminifers;. accompanied. sakamotoensis large. debris. coral. small. Ptygmatis. sp_,. bearing. and. cltrster,. PhaneroPtyxis. CryPtoPlocus. and. a. Cossmannea. and. ooids. dark-Colored. and. algal. of in. limestone. and. of. indicating. occurs,. no. debris. algal. early. sp.. is somewhat. some. amounts. 15. Japan. layer. upper. containing. sp.,. conglomeratic. stromatoporoids. the. is aggregated. Nerinea. in. Gastropoda. of. small. with sp.. n. as. such. nerineids. limestone. size,. arenite. Nerinea. Nerineid. biosparite,. of. composed. coarse. Some. nerineids. Station,. from. Shimomitsuki, this. locality. ibid. ; Torinosu･1imestone is. omitted. in. this. article･.

(8) T.. 16. SIjIKAMA. S. YuI. and. Oxfdrdian･ (upper part) ; early Amakusa･gun, lsland, of Shishi-jima. formation. of the Yatsuji ･Loc. 9. Western coast Goshonoura Loc.. 10.. group :. a. About. Kumamoto. 1ate. Oxfordian. tbe. :. to. About. same. form.. ornaments. of surface. divided. or. into. Futami,. of. view. have. very. the. as. by. the. columellar and. (1927),. DESHAYES. have. beeh､. and. classi負ed. Entomotaeniata. cation. and. Family. Nerineidae. Genus. Nerinea. ･. ”. ”. Laevinerinea TeleoPtyxis. Genus. Genus ”. DIETRICH,. MAURY, FISCEER,. APtyxiella. s.. Nerinoides. ”. Endiatrachelus. ”. BactroPtyxis. Subgenus. 1925.. CossMANN,. ”. Trochalia. 1934,. 1896.. 1885, str. 1940.. WENZ,. CossMANN, CossMANN,. CossMANN, SHARPE,. Trochalia. 1906.. B(うsE,. APhanoptyxis. Aカhanotaenia. 1938. 1934.. PcELINZEV,. PlesioPtygmatis. Subgenus. 1896.. 1850.. OLSSON,. NeoPtyxis. P.. 1896. 1896.. CossMANN,. ”. APtyxiella. revised. 1896.. S日ARPE,. 1898.. 1896,. 1898.. 1850. s.. str.. ”. CryPioPlocus. PICTET. ･. EndiaPlocus. CossMANN,. &. CAMPICHE, 1896.. 1898,. ltieriidae. (1940). WENZ. CossMANN,. ”. Gonzagia. In. one.. CossMANN,. FibuloPtyxis. ”. and. subgenera. str.. MelanioI)tyxis. ”. ”. paleontologists.. AcrostylusノcossMANN,. Ptygmatis. and. gastropods. Nerineidae,. 1862.. the. in. his. the. nerineids.. Nerinea. CossMANN. Neri-. while. (1825) and of. size,. shape,. Nerineacean. DEFRANCE. by. number. and. shell. as. (-Ceritellidae),. 1827.. s,. shape. no. are. W.. the. and. structure. internal.folds,, marked or group called Nerinea. have. Nerineidae. DESHAYES,-. DiozoPtyxis. Prefecture;. internal. In general,. genera. following. Nerinea. ･. ･. of. many. the. ”. formation;. Kumamoto. important. as. proposed. Subsequently,. proposed. Subgenus. was. families. the. are. ; Tubiferidae. number. by. described. City,. for cla;ssi丘cation. form.. apertural. Nerinea a. Sakamoto. upper. characteristic. plications. families. genus. Yatsushiro. criteria. ltlieriidae. Tubiferidae and nellidae latter three families them and carry Since. the. clas崩fication of ■. 一Historical. four. in. Asbikita-. Tanoura-cbo,. of ュgo-misaki,. lens. :. a.. Therefore, folds. are. north. gastropods. of(internal. sp･. east. Prefecture. Kumamoto. found･. was. Kimmeridgian_.. early. as. Nerinea 500m and limestone. south. 2km. horizon. Nerineacean shell. loom. Prefecture;. gun,. b. ; Cenomanian･. emended group. compiled new. CossMANN's. suborder classifi-.

(9) Some. On. Family. in. Gastropoda. 17. Japan. ltieriidae. Genus. Itieria. MAT13ERON,. Subgenus. Itieria. CossMANN, CossMANN,. ?. Subgenus. L. In 1954, the. genera. a. DIETRICI-I, 1954.. Cox,. Cox, Cox,. was丘rst. He. all species shells. 1idae. Cox. (1925). its. the. new. for. CossMANN's a. position. the. for. AdiozoPtyxis no. smooth. diagnosis. subgenus. ､as. Diozoptyxis,. the. same. had. species. of Nerinea.. of. the. reason. its. of. diagnosis. with. matter. for their. whether. not. of. Cox. Trochalia. Pseudotrochalia. DiozoPtyxis, but. to. Nerinea CampaniPICTET. CryPtoPlocus. SIiARPE,. de丘ned. 1850.. Trochalia. Also. as. S甘ARPE,. Trochaliopsis.. and. that. considered. ;(1952)should classi丘cation. WENZ's. treated. erroneously. YouNG. of. Nerineidae. to. time,. synonym. genera. K･. type. referred the. (1940). hand,. in. At. Junior. WENZ. and. Other. subgenera. a. as. his. proposed. On. been. (1939)**. 1862,. DIETRICE. that. had. D'ORBIGNY,. CAMPICHE,. in. Adiozoptyxis,. genus to. referred. announced. DELPEY. systematic DIETRICH's the. (1914,1925)*. de丘ned. as. a. proposed. been. 1896･. tuberculated.. or. Cox. morinifera by. had. smooth. Besides,. it. gave. and. which. are. 1850.). DIETRICH. by. just. emended. treatment,. arti丘cial. 1916･. CossMANN,. proposed character. (1954), however,. Cox. CossMANN,. gHARPE,. Nerinella. of. 1954.-Phaneroptyxis. (1896).. DiozoPtyxis. Fauria. 1954.. its internal. with. new. 1954.. Cox,. AdiozoPtyxis. several. 1925･. for. nov･. Cox, Cox,. EndoPlocus. including. homonyms,. 1954.. (subgenus. Pseudotrochalia. from. (1914). nom･. Cox,. MelanioPlocus. Trocaliposis. genus. proposed 1931･ In. 1954･. 1954,. Nailswarthia. Cossmannea. speci丘c follows;. as. subgenus,. Carina. Julesia. and. of Nerinea and PcELINCEV,. diagnosis. earliest. the. under. AdiozoPtyxis Eparciella. the. generic. new. 1916.. examined. revised. and. str.. 1916.. CossMANN,. Eunerinea. also. s.. CossMANN,. R. Cox. subgenus. 1.954, he. 1895･. Phanero♪tyxis. ? Curetia. Genus. 1912,. CossMANN,. ? Favria. 〃. 1896.. PERVINQUI丘RE,. Murhilaia. PhaneroPtyxis. ･. 1916.. 1867.. STOLICZKA,. Itruvia. ''. str.. CamPichia. 〃. Genus. 1842.. s.. Brouzetia. 〃. &. Nerineid. comprise. genus. Nerinea. and. the. following. two. groups:. 1). Those. CossMANN, * **. with. three. CossMANN,. DiozoPtyxis. Quoted Gastropodes. from. Co又. less. or. folds,. Nerinea s.s., as Fibuloptyxis such Acrostylus CossMANN Mela･nioptyxis and. (1954)･. mesozoiques. de. la. region. libanaise,. p.. 209..

(10) T.. 18. SHIKAMA. S. YtTI. and. CossMANN.. 2). Those. DIETRICH,. nea. four. with. or. folds,. more. NeoPtyxis. OLSSON,. TeleoPtyxis. as. such. Ptygmatis. Laeuinm-. SHARPE,. PcELINCEV. PlesioPtygmatis. and. B6sE. He do. not. also. Family. Ptygmatis. or. and. groups.. arrangement. and. following. the. Proposed ltieriidae,. CossMANN. Aphanotaenia. and. based. number. mainly of. classification the. on. shell. form,. folds:. Nerineidae. Subfamily. PcELINCEV. Nerineinae. Genus. Nerinea. DEFRANCE,. ･. ”. FibuloPtyxis. CossMANN,. Cossmannea. PcELINCEV,. Ptygmatisinae. Subfamily Genus. ･. Subfamily. OLSSON, CossMANN,. Subfamily. PcELINCEV,. 1931･). PcELINCEV,. 19351). 19531. DIETRICLI,. 1939. 1934･. PcELINCEV 1889,. OppENHEIM,. DiPtyxis. PcELINCEV,. Oligopiyxis. ･. (emend･ (emend･. 1906･. PcELINCEV,. Diptyxisinae. Genus. 18961. B(うsE, PcEI,1NCEV,. NeoPtyxis. 1861･. 1896,. PcELINCEV. Laevinerinea. 〉〉. CAMYICtlE,. CossMANN,. Plesioplocus. 〃. &. CossMANN,. PlesioPtygmatis. 〃. 1896･. PcELINCEV. DiozoPtyxis. 〃. 1934･. PICTET. Diozoptyxisinae. Genus. 1894･. ? Teleoptyxis. EndiaPlocus. Subfamily. 1898.. APhanoPtyxis. CryPtoPlocus. 〃. 1898｡. SIIARPE,. Cryptoplocinae. Genus. 1896.. PcELINCEV. Ptygmatis. ･. 1850.. CossMANN,. MelanioPtyxis. ･. 1825, CossMANN,. Endiatrachelus. n. Family. and. character,. MAURY. KoROBKOV. and. Nerinellidae. Nerineidae,. internal. Nerinea. of. PcELINCEV. In 1960, of. diagnosis. fit the. Gonzagia. that. out. pointed. 1953･. Nerinellidae Genus. 1894.. SHARPE,. Nerinella. (-Nerinoides 1885･ (-Aptyxis. FISCIIER,. APtyxiella. ･. PcELINCEV,. ･. PolyPtyxis. ･. Bactropiyxis. ”. MultiPtyxis. PcELINCEV,. 1954.. Plesioptyxis. PcELINCEV,. 1954･. APloxus. ･. 1938.) 1873;. -Pachystilus. GEM-. 1878.). MELLARO,. ”. WENZ, ZITTEL,. 1924･. CossMANN,. 1896･. PcELINCEV,. PcELINCEV,. 1954.. (-Aptyxis. 1924:. aff,?GonzagiaMAURY,. 1924;. non. ZITTEL,. 1873.) CossMANN, Family. PcELINCEV,. TriPtyxis. ･. Aphanotaenia. 1925;?. 1898.. ltieriidae. Genus. Itieria. picheia ”. ･. MAT王1ERON, DIETRICH,. PERVINQUIBRE,. :. CossMANN,. STOLICZKA,. 1912;. 1867. ? Favria. CamPichia. subgen.. ; Brouzetia. 1925). PhaneroPtyxis Itruuia. 1842. CossMANN,. CossMANN,. 1896. (-Cam-. 1916･. 1896.. (-Vernedia CossMANN,. MAZERAN, 1916.. 1912). :. aff･?. Murhilaia.

(11) on. The removed. major. part. to. generic. the. some. Nerineid. the. Of. seems classification in which the internal. Nerineids In this. article,. questions. On The the. shell. internal. of their on. for. inner. and. in. The. by. The. gastropod. very. ornaments. exist. elements. paleontologists. many. admit. writers. in as. importance. the. al.. and. parietal. or. the. by. glossary. L･R･. Cox. of. internal. folds. important. very. are. and labral*. DiozoPtyxis. one. carry. each. Cossmannea. (patternト1-1).. fold. on. and. CryPtoPlocus. †olds. pqlQtQL coLumeLLclr. folds. columellqr. p【icqe. 蛋. ＼ LcLbrcLL. pcLr'retcLL fold pcLLQtQL fold. A:. Outer. lip. Schematic丘gures. Nerinea.. beside. pcLrietQL. foLd. 3.. basal. for. of nerineids.. pdrietcLL †old. Text一色g.. (1955). plications-. Nerinea. colurneuQr. of. (1960).. arrangement. and. in. found. are. classi丘cation. lip. are. in Text一色gs･. shown. as. construction,. complicated. of folds. number. several projections, which are families･ These projections are. terms. terms. morphological. In Nerineidae,. *. few. a. remain. some. with. taxonomic. considered-. there. volution. other. their. with. infrageneric. mella,. are. which. of. the. ∫.B. KNIGt汀et. by. form. complicated. classiBcation･. side. -Arrangement the. shell,. sometimes. 3, 4, together Tbe. PcELINCEV. of. elements. in shell. varied. much. infrageneric. invisible. delicate. element･. signi丘cance. the. almost. but. of. Japanese. the. adjust. classi丘cation there although. genus,. by. established. taxonomic. useful. the. taxonomic. some. somewhat. surface,. structure. important. or. are. nerineids. a. mainly new. were. genera一. some. concerning. one. add. and. is. were. classi丘cation. to. applicable. structure adopt. writers. (1960). KoROBKOV. and. the. be. WENZ's. subfamilies. new. to. Their. them.. on. some. and. 19. Japan. in. taxa. subgeneric. taxa. in. Gastropoda. B:. one. (exterior. the. showing. C:. CryptoPlocus. wall. fold. internal. Ptygmatis･. of. whorl. structure. D:. side)I. Itieria.. the. colu-.

(12) 20. T.. CoLumeLLar. SEIKAMA. S.. and. YuI. H[GHTR.1ANGULAR. the. fold. とゝ`ニユ. folds. 一正 WITH2KEELS. ∠=ゝcRESCENT. ParI'etaL. more. or. 3).. 屯wITH2_KEELS. G.. Text-丘g.. 4.. on. Some. shapes. in. internal. of. folds. fold. Grade. the. (6a). of -Shape The pro丘1e. folds-. shell. The. axis･. folds. of. is. shape. a. the. nerineids. complicated. in. shown. Family Subfamily Genus. 1942･. Nerinea. Types: stored. 7023,. at. 7371, Three. *. 439-442,丘gs･. pp･. Three Institute. type. 3-5.. &. and. infrageneric is usually. Several. shapes. species. 1873. 7,. 1931 1825. DEFRANCE, &. 1825. AsAO. 8). AsAO;. Jour.. Geol.. Soc.. Japan.,. 49,. vol.. (in Japanese) illustrated. specimens. of Geology. along. shape. SuGIYAMA. SuGIYAMA. (s･s･) naumanni. 590,. noT. section. the. DEFRANCE,. Figs.. the. on. 4.. tuberculosa. 4,. weak. the. PcELINCEV,. (Pl･. one. with. for. Nerineinae. naumanni. from. element. ZITTEL,. Nerinea. (1a). and. ranging. instance,. Nerineidae. Type-species:-Nerinea Nerinea. of. 1. Ptygmatisinae.. Text一色g.. Description. grade. of. based. arrangement. visible. shape. important. in. is. folds.. For. of. are. by. very. bLlt. Very. nerineids. 丘ve. to. is described. taxonomy. in Nerineinae. simple. four. with. fold. of. specific. and/or of. 7. estab-. folds. of. of folds,. strength. nerineids.. Grade to. grade. six. 3-ト2. (1941). His. number,. to. (pattern. DELPEY. nerineids.. but. five. carries. the. the. Nerinea,. folds. 1ished. DISTAL■. eminent Neri-. In. shows. as. pattern. or. 金w･TH3ヰs ｢らROUNDEDIN. Hetero-. five. Nerinella. Bactroptyxis. ￣屯HOOKSHAPE. 督w-TH4KEELS. columellar. (pattern 2-1-2).. same. latter. and. carry. nellidae,. FLATTOPPED. re-. lacks. the. and. and. Ptygmatis. Ptygmatis. ∠二=ゝ∠=ゝ FLATTOPPED. ∠==ゝ. palatal. ones.. ∠二ゝ∠ゝ. ASYMMETRICAL. parietal. both. TRIANGULAR. LOW ∠ゝ`==二ゝ. former. the. △∠ゝ. △△_. folds,. one. and. spectively;. こユsuBQUADRATE. ∠ゝ一△. two. carry. PalataL. by. SuGIYAMA. and University. Paleontology,-T6hoku. AsAO. (IGPS. are. mos.. 65283). specimens. Geological. (GIYUIM-95197*). lnstitute･. Yokohama. collected. National口niversity.. from. th?. Torinosu. limestone.

(13) On. formation. of the Yatsuji Prefecture, are. than. 15 for. Spire. two. low,. tubercle twice. almost. a deep with infrasutural. ture. unknown,. with. thick. of. shell)･. of. inner. tapers. but. Last. and. rather. feebly. The. labral･. acutely. pointed. portion. of. of distalward,. eminent highly. projecting. and. one. base. and Aper-. each. rhombic. wall. consisting. the. columella,. developed,. thin. and. from. fold.. slightly. little below. a. at. situated. (axis. columella. on. stoutly. palatal. supra. almost. with. short, downward. the. of. rather concave. groove-like. is. interior. and. abaxially. the. both. section. folds,. except. distinctly. toward. abaxially.. fold. palatal. smooth. reglOnS.. 60 degrees. about. at. Volution. surface. longitudinal. three. lip toward. parietal. sutural. in profile and triangular The fold rather parietal. asymmetrical. of height. K6chi. of consisting least 10 to. but. surface. rapidly elevated impressed, narrow. carinated. carries. apex;. volution. lip joints at. strongly. labral･. and. Takaoka-gun,. unknown,L. the. each. in. profile. lips. angle. lower. and. and. whorl outer. 21. high-turreted,. rather. toward. Suture. lip; basal. size,. high;. as. whorl. Japan. Togano-mura,. apical. upper. wide. regions･. 且at-topped, half. regularly. depression,. lip. parietal. whorls.. as. outer. in. Precise. on. in. topotypes.. as. moderate. series. Gastropoda. Kamimitsuki,. at. Shell. twelve. degrees･. Nerineid. designated. DescriPtion: more. Some. straight,. the. The. middle. columellar. fold. low in pro丘1e, situated triangular rather and wide-based at one-third height from In spite of each fold, the whorl is the base･ strong space SO. of not. narrow.. SuGIYAMA. Comparison: the. of. rence. Togano. present. Basin･ the. at. observed shaped,. to. volution. 3-4mm. from. species. According. (1942) pointed. AsAO. and. diameter. of. ten. about. in diameter. base. at. and. the. tubercles. 18mm,. and. 2-3mm. in. Sakawa-. the. of. of sutural they. occur-. abundant. limestone. Torinosu. the. them,. out. conical. distance. height;. are. region large,. are. between. 盲. distal are. end feebly The. was. tubercles,. of. species. by. reported but. larger. of. Japan,. Nerinea,. i. e.. the. Prefecture･ Hanahata, YAMA. hl. mm.. Our. however,. Specimen,. present. Loc. Two. the. tubercles. and. both. Nerinea. of smaller. Jurassic. other. shell,. species. Takaoka-gun,. Sakawa-cho. Prefecture,. of. were. and. reported. K6chi at. another. by. SuGト. species.. of the. sugLyamai 4,. the. Togano-mura,. in K6cbi. (Pl･. its. by. which western. volution.. Kobama,. near. AsAO to yield the present and Geological horizon: Middle part. formation. somaensis.. Kamimitsuki, one. latter. the. from. RoEMER. tuberculosa. Jurassic. broader. is apart. sugLya･mai 8a.. from. rather. species. localities,. Togano-mura,. Upper. is distinguished and. Nerinea. to. allied. from. tubercles. higoensts,. Occurrence:. is closely. E. KAYSER former. the. number. In. 4-5. visible. present. Europe,. is about. Figs.. Yatsuji. nom.. 9-ll). nov.. formation. ; late Oxfordian..

(14) T.. 22. 1942.. Nerinea 1883.. non. (s.s.). 49,. vol.. Nerinea. Types:. cat.. Materials:. direction. naumanni. Geol.. Jour.. SocI. Japanリ. DIETRICIi,. 1925;. Cart.. Mes.. Fam.. Neri-. 65278.. apical. The. apex. unknown;. regularly. not. are. also. pleural. and. very. along Two. subspeci丘c. and. name. to.. referred. angle. rather. cylindrical･. of penultimate. tapers. slowly. cut. preserved.. the. high-turreted. exceedingly. angle. are. under. AsAO,. &. are. specimens. base. and AsAO. and. SuGIYAMA. large,. Spire. at. whorls SロGIYAMA. by. and. 9 degrees.. about. ; some. Shell. number. in. GIYU-M-98-102.. neumayri. Description: Whorl. 7024,. specimens,. illustrated. specimens Nerinea. AsAO;. (i!1Japanese). 2.. STEFANO;. mos.. Five. longitudinal. 1,. Animリ31.. Cat.. IGPS. &. SuGIYAMA. neumayri. DI. S. YuI. and. 439-442,丘gs.. pp.. neumayri. Foss.. neidae. naumanm'. 590,. no.. SHIKAMA. whorl the. toward. apex.. ト. Volution. rather. volution. surface. the. at. high,. of. of which. the. ridges,. the. of that. while. deeply. the. middle. Aperture. narrowly. opened. columella the inner. (axis. quadrate. parietal. pointed. distal fold the. of. the. in section,. fold end,. projecting. Palatal. becomes. fold. so. at. s汁uated between. with. of. acutely corner;. about. one-third. of. developed. highly palatal. sub-. of height. and. stronglァand. narrow. very. half. on. two. high,. parieto-columella. near. in shape,. triangular lip.. cavity. from. folds,. stout and. a､1ittle hook一台baped. thin,. short.. and with. eminent. very. carinated. degrees. 58. below. at. abaxially. wide-based. fold. palatal. situated. relatively. columellar. whorl. lips;. outer. Suture. posterior-. sharp. about. three. carries. wall. pro丘1e,. projected. strongly. with at. Each. in. conical. eminently. joints. tubercle. infrasutural. of height.. middle small. rbombic. three. and. preserved,. lip. Basal. Interior. the. on. and. elongated. ends.. shell).. low,. rather. imperfectly. somewhat. triangular. labral;. columellar. of. about. subglobular. whorl,. anterior. one. and or. height. Last. at. supra. the. each. swollen. and. for. except on. situated. one. 1.1-1.2;. width about depressions,. smooth. ones. series. one. the. shallov. rather. middle. lower. and. depressed.. abaxially･. that. and. upper. of. the. to. two. with. surface and lower. upper. respectively,. tubercle. undulated. height;. height. of the. ratio. slightly. middle. series,. the. and. columellar. folds. The. ComParison.･ SuGIYAMA. manni latter. by In. series.. been. its. Japan,. species. DuMORTIER in the. & mode. tubercles. some. internal. of. than. Occurrence:. The. character.. folds, the. of. 8a.. the. and. a. but. the. presence. ornamented. close. present. (CossMANN,. internal. Loc.. bear. species. is. of Nerinea. species. FoNTANNES. those. volution. to Nerinea similar distinguished from clearly. nau-. somewhat. former. the. higher. other. no. is. species but. AsAO, shell,. but. recorded, in. &. larger. present. to. is similar. 1898). in the. former. has. more. the N.. to. form. general. tubercle have. tubercles. with. resemblance. species. three. of. the. present. thiollierei. of shell. eminent. and. and. sharp. latter. Kamimitsuki,. Togano-mura,. Takaoka-gun,. K6chi. Prefecture. Geological. horizon:. Middle. part. of the. Yatsuji. formation;. late. Oxfordian..

(15) On. Some. Nerineid. Nerinea. higoensis 3,. (Pl. Types:. Sixteen. GIYU-M-21-25,. GIYU-M-25,. The. specimens. are. been. No.. Height. GIYU-M-21. 85. surface of but in adult smooth, abode. fectly. by. 53. about lips,. outer. degrees. in. projecting. situating. distant. point. between. based. triangular-shaped. In Juvenile. stage. mella. and. folds. become. thin. compared. form. moderately. The. by. its. chamber. the. internal. more. slender and. by. length. and. at. about. as. of juvenile. character, columella, absence. but. the. smaller. of. JOints. inner. of. height. till the. of lab∫al,. center. of whorl from. abaxially. lip from. parieto-columella low. height. of. to. diameter, other,. hence and. and. wide-. columellar. each. and and. other. in adult. columella. lip.. Colustages. relatively. stage.. species limestone. much. lip. projecting. of. each. and. round-topped. middle. compressed. volution from. imper-. Basal. comparatively. one-third. relatively. rapidly. Torinosu. of parietal. carries. folds. present. the. the. folds. a. outer. high,. hook-shaped,. separated. that. with. from and. so. little below. and. lip. consisting. fold. rounded. subcarinated. Aperture. section.. wall,. palatal. and. whorl. thin. cross. almost. situated feebly Suture. canal.. with. on. less). broad. Last. siphonal. width;. depressio･ns. of. part.. tapers of. or. adult. of. percent. volution.. of. con-. $1owly. loth. two. with. Interior. a. at. solid. whorls, not. shell. Apical. angle. very. about. portion. observed. acute. fold of. ComParison: mom.. thick,. lips grow. of. number.. eighty. to. rhombic. folds,. and. height. middle. in pleural. about. (up. distored. two一丘fths. about. diameter. subcylindrical,. but. regularly. parieto-columellar. fold thin,. Columella. in. more. degrees. height. columella.. pro丘1e,. or. suprasutural. as. eminent. ; parietal. 13. elongated far. three. corner.. n.. except. preserved.. high-turreted,. middle. the. of. with. adaxially. chamber the. direction. preserved.. 30mm. twenty. undulated. slightly. so. end,. whorls whorls. and. volutions. the. below. and. carries. subquadrate. below. somewhat. posterior. at. 15. Spire. gently. elevation. short. preserved,. narrow. stage,. little. a. formed a. 4.5. :. high,. several. and. lying. with. :. exceedingly. rather. the丘rst. impressed,. 27 21. height. degrees.. 4 about Volution. apex.. little. in. apparently 7 to whorls,. early. small,. the. ridge, below. longitudinal. along. whorls,. several. very. a. syntypes.. Widtb. mm. large,. Shell. outer. at. as. locality.. the. at. numerous. of. 270. reaching. observed. of. stage. cut. 135. Description:. toward. designated. are. (in millimeters). specimen. angle. 1-5). 26.. GIYU-M-22. sisting. Figs.. nov,. GIYU-M-2ト36,. specimens,. Measurements.-. has. sp.. 23. Japan. are丘gured.. Materials.･. A. in. Gastropoda. is closely. allied K6cbi. of Sakawa, former palatal. tubercles. is. Nerinea. and shell. sugiyamai in. Prefecture,. distinguished. fold on. to. broader surface.. from. general. the. space. The. latter. of whorl present.

(16) T.. 24. is also. species. DEFRANCE). was. which. SuGIYAMA. naumanni palatal. fold. similar. to. in. distinguished. form. yabei. sakamotoensis algae. species lying. directions by. covered. Text一丘g.. 5).. they. may. nerineid shells deformation in rocks･. show. These. of the. this. current. distance. in. lived. area. was. after. From a. in. near. no. Of. reef. frontal and. On. in. or. region. a. apical. in association. PhaneroPtyxis like. this. thick. meters. in. hand, part. of. suppose. channel-like transported. were. calcare-. shells. nerineids erosion. writers or. eminently latter.. arranged other. also. France. in the. several. are. the. these. the. they. of. of shell. while breakage. is. Stromatoporoids,. thicker. facts,. these. strong,. rather. attached slgn. eminent. of. sp. and. slender. rather. all shells. (see. of shell were. alive.. shell that. except nerineid. where. region over. a. small. death.. -■■■■■■■. 1cm. Text一色g1. 5･. Stromatoporoids, a,. enveloped aplCa】. view.. the b.. shell lateral. snrface view.. of. 〟.. to. akin. more. facies. n.. layer. a. axis. are. which have. than. near-reef. of laminae.. plane. fold. High-spired. longitudinal. each. its. orientalis. concentrated. stromatoporoids. So,. in. by. of hexacoral,. pelecypods.. much. with. palatal. occurs. fine debris. the bedding;. to. sp.. tuberclosa. as. Kimmeridgian. distinguished. prominent n.. lower. the. AsAO. more shell, slender The present species. and. Heteroptygmatis. sp.,. shelled. usually. parallel. random are. thin. and are. is. but. more. sp., besides. n.. from. N.. (non. and. tubercles.. of. higoensis n.. SuGIYAMA. its larger. D'ORBIGNY. and. RoEMER. tuberclosa. by. by. aspect,. and. Ptygmatis. N.. absence. bernardiana. general. ous. AsAO,. the. elevated sutural ridge Habitat: Nerinea with. from. S. YuI. and. considered. & by. and N.. StjIKAMA. Nerinea. higoensis･.

(17) On. 0ccurrence:. Loc.. Tanoura-cho,. ura,. in Kumamoto. Nerineid. 10a,b.. Gastropoda. 2 kilometers north of UmillOabout 2 kilometers both about north of Futami,. and. horizon: to. Limestone. lens. early. GIYU-M-37-42. Materials: with. longitudinal. specimens. Figs.. somewhat. broken. apex. Heigbt. whorls. preserved.. 2. whorls. preserved.. Shell. upper. broad. and. portions. Basal. fold. surface.. with. acutely. one,. at. as. a. Last. whorl, and. lying. rapid. on. elevation. whorl. unknown.. end pointed posterior in longitudinal section. suggested. 65 degrees. about. by. each. deep. one. impressed,. formed. of volution. anterior lip JOints. indistinctly. ridge,. rhombic. lower. as. of. penultimate. of the. which. Surface. with. Interior. columella.. weak. thin. parieto-columella. corner. fold.. Comparison:. In. surface. N･. and. stronger volution, in-both higoensis. Japan,. ridge and of. shell. of. sugLyamai. n･. of. sutural. sugLyamaL;. than. lip, projecting. of columellar. most. species. to. related. but. nom･, area,. and. moreover. in. from. projecting abaxially high triangular-shaped,. fold. ; columellar. of height. palatal. sp･. hook-shaped,. acute. and. one-third. n･. stage. as. almost. 1.09.. Lateral high. inner on one folds, two the and acutely and pointed lips; palatal fold rather in outline, thin quadrate situated at labral, the middle of height projects adaxially; of and shortly. thr6e. below. higoensis. about. spiral. elongated. axis･. outer. than. rounded. notched. width. Sutu･re. shallow.. suprasutural. carries. smooth. one. high,. rather. of. in section.. suggested. in later. depressions,. two. with. the but. consubcylind,ical, 7 degrees whorls about. and. median. as. Volution to. stage,. early. of. angle be smooth,. to. height. the in. widely. shell. Pleural. straight.. usually of. the. and. slendeLi,high-turreted. seems. of shell. spire. rather. large,. whorls.. presumably. of. the. along. Width 2. ratio. Aperture. side. cut. :. little below. lower. is. GIYU-M-37. :. while. parietal. base.. and. internal. as. 26. undulated. little. specimens. preserved. 20＋. slightly. the. are. above. 65. almost且at. on. Two. syntypes.. GIYU-M-38. volution. wall. as. 45十. of. along. 7). GIYU-M-37. the. and. nov.. (in millimeters). sisting of numerous or less. Surface. infra. formation;. direction.. Description:. of. 6,. mentioned. No.. a. sp.. designated. are. Six. Measurements.-. broad,. Sakamoto. upper. 38) are丘gured.. (GIYU-M-37,. wide,. the. somaensis (Pl. 3,. Types:. in. Kimmeridgian.. Nerinea. margins. 25. Japan. Prefecture.. Oxfordian. moulds. in. Igo-misaki,. Ashikita-gun,. Geological late. Some. sugLyamai･. the. present. smaller the. Among. this species. and. present. these. near. at. situated. toward. an. anterior. are. Nerinea. species. has. weaker. folds. species. species,. a. has. higher than more. however,.

(18) T.. 26. there. seen. are. somewhat but. Occurrence: Prefecture.. shells. The. are. molluscs,. coral,. Koike,. 8a.. horizon:. character. or. even. general because. of. Fukushima. City,. associated. no. with. other. nerineids.. limestone. Nerinea. Types:. GIYU-M-103. Materials:. A. single. oblique section). Measurements:-. member. koikensis. (Pl1. 3, Fig･. is designated. as. cut. specimen. Nakanosawa. the. of. forma-. Shell. Description.･ eleven less. more. in. decreases. toward. the. Volution. surface. distinctly. forming shoulder strong. canal. on. section･. cross. fold. parietal. lip of. one-third tween. of. labral,. or. becomes. but along. vith. rather. penultimate depression. of. and is most. very. deeply. obsolate. at. internal. longitudinal. lip and. whorl. material. and may. one. palatal. from. the. about. three one. a. little below The. inward.. general. enable. is deficient form us. of to. grasp. on. one-third fold projects. carries. notched observed. thin. very. Columellar. corner･. last. direction. at. and. angulated. widely far as. so. reglOn,. whorl. lip･. outer. lip. Basal. carries. inner. the. on. depressed. structure. wall. situated. folds. Unfortunately. the. two. columellar parietal. with. volution. and. Last. ornamentations.. Interior. parieto-columella. flat. 8. about. infrasutural. end,. posterior rhombic. eminent. based,. or. little below. a. at. distinct,. a. and. whorl Each. high･. as. wide. as. deep. a. pointed. columella･ folds;. widely. height. which. Remarks: tion,. twice. presumably no. of. 20. of. margin. acutely. have. to. from. columellar. abaxial. Aperture. wedge-shaped. parietal. at. rather. and. degrees. 65 acutely. and. keel. consisting. whorls about early Width of spire gradually shell.. angle. almost inward by. turreted,. slender,. several. of. pleural. and. 10. rather. low,. rather. seems. surface. (slightly. direction. Width. restored. Of. apex. concave. sharp. afld. anterior. about. longitudinal. elevated toward of labral gradually of height and a broad, has high ridge which rounded and On its incor王SpicdotlS Suture side. posterior with. middle. shell. holotype.. 41 ＋. 血eaSurement. degrees.. 8). Height. in size, small Apical angle. whorls.. degrees. nov.. along. GIYU-M-103. or. sp.. (in millimeters) No.. cut. in. form,. ; Kimmeridgian.. tion. a. S6ma. in oosparite,. aggregated. Koike. 1898). is. species. is impossible,. Kashima-machi,. stromatoporoids. Geological. present. latter.. the. of. Loc.. The. aspect.. (CossMANN,. internal. of. internal丘gure. of. general. BuvIGNER. comparison. sufBcient. lack. the. N. contorta. to. S. Yul. and. in. difference. slight. similar. a. S臼IKAMA. at. joints. subequal,. low. the. lips･. outer. of portion below situated adaxially. be-. of height. the middle palatal fold. disappears. for. determina-. precise. shell a. of. the. general. specimen outline. of.

(19) On. the. Some. Nerineid. Gastropoda. in. 27. Japan. species.. The. present. species. of. by. Upper. arrangement. from. 1898). delicate. France. has. shell. by. and. Prefecture. sp･,. as. of. folds. the. by. and. their. (CossMANN,. present. angulated. is. species very. shoulder,. folds.. this. S6ma. Fukushima. Bactroptyxis in. etc.. nobL'lL's. biomicrite. only.. Nakanosawa. the. of. member. City,. are. species. bexacoral,. of. limestone. Japanese. other. D'ORBIGNY. but. Kashima-machi,. debris. or血e Koike. acreon. strongly. internal. associates. pebbles. N.. aspect,. size,. projected 8a. Koike,. horizon:. Geological. such. the. interflal. small. and. similar. smaller. immediate. some. and. its. Loc. The. species,. somewhat. feebly. low. test,. thin. from. distinguished. eas.ily. Jurassic. Occurrence:. n･. its. distinguished. clearly. is. species. Nerinea. forma-. ; Kimmeridgian.. tion. Nerinea. 4,. (Pl･ 1940･. Nerinea. sp･. fecture,. NAGAO; rigida VI, Contr. Inst.. cf･. Part. sp.. shiidai Figs.. SI寸ⅠIDA,. 1-3) I., Geology. Pal,. Geol.. nov.. Ke白ennuma,. rlear. T6hoku. Univ”. Iwate. 33,. no.. pp.. 51,. Pre･ in. list.. (in Japanese). Types:. GIYU-M-44-49. Materials: at. apex. All base,. and. folds. and. of each Measurements.-. the. six. and. are. specimens deformed are. specimen. Heigbt. :. 4.5. /. :. 6.5 ∇borls. Shell. but. straight. and broader. delicate. and each. carinated. wall. Situated. high,. high;. and. to. rhombic. three. fold. of parietal at. gradually. than. abaxially. ; parietal. portion. very. Last. carries. one. probably. ridge.. subquadrate. a. situated. less. little at. eminent. 15. than. shell. surface. lines which. whorl with. run. though. siphoflal. short. with. folds卜One. On. and. acutely. lip;. columellar. fold. above. columello-basal Ⅲliddle height of. short,. the. thin. canal,. widely. rather. by the. imperfectly. aperture. a. opened. anterior lip. and.. margins and. portion. middle. of. former. the. latter. the. num-. shalloⅦ-. preserved,. and. the. Quter､. Outer. suture.. on. volution for. except. littie undulated lying. of spire. margins. smooth to. owing. Restored. apex.. rather. inconspicuous, and. Lateral. the. consisting. unknown. precisely. obliquely a. preserved.. high-ttlrreted,. degrees. toward. taper outer. straight almost Suture very. volution. sutural. the. preserved.. whorls. exceedingly Apicai angle. 〈at. growth. depression.. low. irl Size,. medium leas=wenty.. whorls,. moderately. that. so. whorls. of. Width 25±. deformation,. broad. very. 85-. numerous. part. in various directions, in shape. different. GIYローM-46. of. lack. above. 70±. to. of. mentioned. GIYロ-M-44. DescriPtion:. erous. syntype.. as. (in millimeters). No.. almost. designated. are. presumably end.. t硬0<､0.a. interior the. inner. hook-shaped, low. and. corrler; labral,. at the middle situated almost triangular shaped,. Palatal projecting. fold. very. adaxially. thick till. and near.

(20) 28. T.. the. central. with. abaxially,. fold. rarely. the. while. between. is di氏cult. species. due. upper. The. to. species. because. StIIIDA. volution.. the. the. by. its. projected of. extremity. in. question. palatal. of. slender. shell. cf. rigida. NAGAO. the. wit･h. is distinguished. Nerinea. expanded. proBle.. preservation. it. but. reported. one. species. imperfect. rock, Cretaceous. (1940). in. fold palatal is eminently. of. projected;. the. of. of. portion lower. squaとe. in. lower. the. of. flat and. comparison. deformation. the. is feebly. one. becomes. keels. ComParison:. S. YuI. and. Distal of whorl chamber. two keels, of which the. portion or. one. SⅢIKAMA. the. specimens. from. foreign. the. 且at. and. other. from. surface. the. of. middle. <. of the. part. from is. ()shima. formation, by. NAGAO. rigida. expanded. prominent. spiral. sp.,. the. present. eminent. more. the且at. in. ridge. Nerinea. to. similar. keel,. a. with. its. but. sutural. fold. distinguished. easily. of. oblong-shape. bythe of volution add The present species. portion. by. species. palatal. surface. reported. is. NAKAZAWA. which. presence. MuRATA. (1966). in. Prefecture,. and. of. is somewhat. from. the. 人. Hauterivian former. the. Barremian. to. 也.as larger. Mine. stronger and Northern sea. 4.. island,. Kesennuma. City,. lwate. folds. than. Iwate. but. latter.. the. of Yokonuma Prefecture. coast. 人. Oshima. area. in■ternal. shell. Loc.. Occurrence:. Omine. the. of. Rikuzen-. village,. ′ヽ. Geological to. horizon:. Middle. part. Oshima. the. of. formation;. Hauterivian. Barremian.. Nerinea 4,. (Pl･ Nerinea. 1934.. 3, pp.. Of. TyPes: 丘gure. 1. the. of. by. collected. Hiraiga. the. Measurements.-. below more. obliquely. tapering. ". toward. distinctly. for. Shell apex. concave,. height.. forward. IV,. ser.. vol.. (1934), the Four. paratype.. the√.calcareous. designated. are. speci-. sandstone. coast. northern. in. one. of as. Hiraiga,. topotypes.. Width 36十:. 93. description:. except. as. at. Prefecture,. 99. the mid in且ated than. smooth. Univ.,. NAGAO. other. Hn4). 155. (Eolotype). high,. of his. Height. GIYU-M-90. than. by. (1965) from. S･ OGINO. Iwate. GIYU-M-89. gradually. Imp.. (in millimeters). No.. Original. Hokkaido. the. and. (Zone. formation. Shimo-hei-gun,. Tanohata-mura,. Sci.,. illustrated. holotype. as. 4-6). 2.. 1,. specimens. designated. was. 38,丘gs.. pl.. two. GIYU-M-89-92. mens,. bed. 250-251,. Figs･. Jour･ Fac.. NAGAO;. (s,s･) rigida. ⅠⅠ,no.. NAGAO. rigida. large,. Suprasutural. the. infrasutural. crowded and. downward.. 36. :. Median. 30. :. 5. narrow,. and. Each. of. portion one;. suture. pronounced. Section. whorls. being. concavity. whorls. 8 whorls. preserved.. high-turreted. extremely. ; imperforate.. the. 4. Anterior. of. whorl most. moderately. a. exaggregated. the. more. very. broader. convex. little and. whorl distinct.. Surface. apparently. lines. growth. which. the. of. whorl. higher. than. run. broad,.

(21) On. three. with. one. anterior the. simple lying. posterior. situated. and. little below. two. of. external. columellar. the. of the. wall. low. rather. the. plications,. than. stronger. columella. corner. posterior. 29. Japan. the. whorl,. third Test. strong.. and. thick.”. Remarks:. This. the. is. species. depressed shell, strongly The fold palatal strongly while. middle. the. at. in. the. of. the. the. of. middle. Gastropoda. plications;. is situated. the. about. Nerineid. short. a. which. moderately. Some. columellar. volution. and. surface bigbly. and. by. high-turreted exceedingly internal structure･ rather simple. characterized and. developed. folds. pa･rietal. with. developed. distal. rounded. portion,. feebly.. The. was fully discussed comparison of this species with the other species by NAGAO. According to him, it is similar to Nerinea archimedi D'ORBIGNY from Lower Aptian France, N. the DE MoRTILLET from the of uogiiana. Urgonian but. N. guinchoensis and distinguished from. is. whorl to N.. pro丘1e. but. projected Locality. the. in the. Aptian. the. fold,. lower. and. Miyako. from. Iwate. Loc.. group. tions. last whorl. near. of. Description: erous. wborls･. margin. of. each. abruptly. no. sutural. somewhat. one. onthe. below. the. and. thickest. situated. two. suture,. corner,. columella. Columella. little below Remarks:. and and. solid. the. inner. sitdated projects. mid. height. Thelspecimen. at. of about. abaxially a. rather. high. as. section.. Wall one;. palatal. height. three. of distance the base. to. and. wide-based. lip. of columellar is tod fragmentary. the. most. with sharply of labral; parietal. one⊥third. to. discern. and. but. subcarinarrow. folds,. eminent. keeled. downward. Outer. unknown,. rather. fold. num-. broad. whorl. Aperture. carries. a. shell Last. of. is rather. and. form. to. volu-. high･. as. wide. of. canal.. in pro丘Ie. one-third. carries. for･. two. consists. depression So. cross. Interior. subquadrangular atlower. hook-shaped,. acutely. coast. direction･. and as. Surface. in. ontbe. About. longitudinal. inconspicuous.. rbombic.. lip and. GIYU-M-40.. two-thirds about deep broad and. and. Suture. elollgated outer. extremity, and. a. are. and. a. carries. ridge.. acutely. more. sea southern Hiraiga of the. and. along high-turreted,. ornamentations visible in lower half with welトmarked anterior. nated. nent. low,. above. eminent. its. similar of Central. one.. part. cut. presumably. rather. volution both. elevated. rounded. large,. Volution. by. also. 1). specimen,. preserved,. are. Shell. latter. aspect,. indet.. 5, Fig.. fragmentary. a. formation. upper. sp.. (Pl. Only. is. species. Northern. Prefecture;. general,. Rose. columellar. 2.. Portugal,. of. in. ; Aptian.. Nerinea. Materials:. This. the. thicker. and. horizon:. difference. (Glen. is distinguished. and Geological Shimo-hei-gun,. of Hiraiga, nation. former. palatal. its slight them folds. of columellar. from. Valanginian. the. by. shape. WfIITNY. roemeri. Texas),. by. and. from. CHOFFAT. promト. adapical fold-thin. from. parieto･ of palatal fold.. triangular. its. fold. gen由･al. at. out-.

(22) 30-. T.. line,. s￠. the. S. YuI'. and. is di岱eulJt, but. other speei･eS with七he higoensis n. sp. irl, gerl･eral. cempaEri.son. tot Nerinea. simil,ar. SHIKAMA. however,. The∴former,. is easilly. fo-rm from. d･istirlguished. internal. and. latter. the. is. th･主sspecies structtlre･. by. deep. haLVing. lowervolufold and o･f voluti･oin Surfa;ce, different s血ap･ed palatal ･depfeSSion is so･meIn comparison European tion. Jurassic species, this species with in to Ki-mmerid.gian N. sculpta DELoR from the o,f France early what similar. form. general is. because. imp･oSsible, Occurrence:. Uminoura,. but. aspect,. and. 10a.. formatiorl. hm'zon:. ; late. Sotlth. Oxfordia:n. to. Neri2Wa. Coss桝annea. Materials.･ GIYU-M-41. Three are. Measurements.-. cut. 6, F壬g･. Height. Deseription:. tion. deeply. c￠nsisting. the. to. striations. served. but. 69. broad far. degreeswith at. ead. o弧也e. near. abaxially. trip aBnd. ￠現teF. toward. a七. of. whorls. apex･. aL. low. preserved. in. sipze,- Subcylin.drical, but Apical,angl-e unknown Voluticin Outer. aEhmptly. Last. thick. both. elevated impressed,. whorl. the. the eorner･. volu･ above. lying. the. on. its. at. carinated. inconspICuOuS′. widely. rhombiewith. prenotched. SeLet壷Gmt. Basalt. 1､ip-■ j,hints at. c￠rnparediwi七h. labral,､ but. aboEtt. becovmes. folds, eminent c,arri,es- tw￠ ;. palaEt琵I fold short aE=-d triangular. mi虚height. of. Colurxtella f由d･ aft. off. elevation. walt one. swel血g-放e､. o.f each. stwface. by. the. and cwr主esL食ne imperfectly Aprerture prr亡由1e.. cro,sS.. inne･r. low,. rather. of base. interior. parieto-colume蛙a. earri思S. on. lノittte{above. aE. 0.6.. obぬ噂tO. ;, itをs very. the. laErge. stlrface･. elongated. ab唖Ⅹ主aI･marg.1n･･. whorls. distinc也y. sigmoiぬ1. ￠b舵rVed. as_. eolumella. pFO･fi1e, si,t脱毛e.a. ho･llowed,.筏払d. and. 4.5. Sp主ra上r主軸e, forrrned. Surface. slightly. :. and. but. low. and. exteri10r. rather. inward. Of volution. with. en屯so. thin. lack. is丘gured･. direction.. Wh､耽k 8. degree乱′. s.haIIow. o.f roll,nded. ma･rglnS,and,. anterior. wid<th. Suture. Suture.. radial. GIYU-M-41. abQVe,. about oEf it about. depressed. supra-infras,tlturalreg10n abaxial. nov.. very. an･d. ntlmer￠uS. of. last whorl. near. height. portion. middle. D'ORBIGNY. aES SyntypeSI. 42. thick. rather. andwidely. belLeLW. and. Sakamoto. upper. Width. 135. Shell. of. of the. ratio. the. (in millimeters). No.. pletxral- angle. in. 1). mentio且ed longitudinal. along. GIYローM-41. high-turrete･d,. of. north. Ⅰ931. desvoidyi. desi､g.mated. specimens. 43,. and. observed･. Pfefecture･. tah'oto sp.. (PI. are. been. not. 2 kilometers. about. PcELINCEV,. Cossmannea. GIYU-M-41-4a. structure. Kimmeridgian.. early. TyPe-species.-. could. (tlTPperlayer). lens. Limestone. Genus. Types:. latter. of the. irlternal. of. comparison. of Igo-misaki, Ashikita-gun, Kumamoto. Tanoura-cho,. Geological. su氏･cient. internaI軸ure. the. Loc.. the. a. very. l･琵b3Eれ弧d thic･k and. li=ttlAebelow. themid. o･ne. in. projects. narrowly. height.

(23) On. of. lip･. columellar. Some. Nerineid. These. two. in. Gastropoda. become. folds. Japan. weaker. 31. lower. and. last. toward. whorl.. Comparison:. The. desuoidyi. mannea. internal. structure,. having. deeper. depression. fold.. columellar. from. Bajocian. the. former. The. has. from but. shell. is. internal. folds.. Occurrence:. Loc･. 7b･. Prefecture･. The. Cryptoplocus. abukumensis horizon:. Geological. present. C. imlayi. to. America,. more. but. latter.. The. eminent. S6ma. the ･pre-. but and､. City,. bed,. oosparite. of SoHL. the. sharp. Fukushima. ass･ociated. with. sp... Koike. limestone. member. Cossmannea. of. Nakanosawa. the. forma-. Material: median. GIYU-M-44･. part. of. 6,. of. ･consisting s､urface. o,,feach. Smooth･. as. volutioJn lolds, one. Last. Side. based. widely. hollowed,. narroLWly at. a. little. below The. Remarks:. lip. s,はbquadFate corner from･ the. parieto-co･17umella. the. and. LUminoura,. Tanoura-cho･,. Geological Oxfordian. horL'zon: to. early. one;. palata:1. reglOn. two. carries. eminent. fold･. and. abaxially toward pro丘Ie, projected height labral. Col:umella mid thick oEf. the. a. carries. of. is too. poor. folds･ and th､eir孟rrangement to Cossmannea tahoto allied. is more surface of ＼volu亡ion Occurrence: Lo′c. 10a.. outer. wall. in. -of internal IClosely. presumably. short. height. themid sLpecim至en. the. of. h≒･igh. Outer. than. of supra-infrasutural. Interi･or. and. whorls. but unknown probably inconsplCuO喝Iying on. Suture. elevation. unknown.. inner. the.. on. each. whorl. Surface. sectio･n･. by. two. subcylindrical, broader. rather. depressed･ cross. Of swellin:g'formed. of. rather. on. observed. thic-k,. rather Volution. Whorls･. voltltion･ genrtly. far. so. -themiddlle. ￣very. numeroJuS. and. 2). only preserved longittldirnal direction.. along. large. Shelil. Figー.. specimen;. single. It is cut. shell･. DescriPtion:. A. indet.. sp.. (Pl.. _late. shape. Of Almenia,. Kashima-machi, in. different. the. latter. the. ; Kimmeridgian.. tion. -Lola. its. by. occurs. species n.. than. in general. from. North. of. PcELINCEV. latter. Koyamada,. France. similar. fold. palatal. the. of. the. and. Utah. southern. C･ subdesuoidyi. to similar distinguished from. former. surface. is somewhat. stronger. and. type-species. Coss-. to. is distinguished. volution. and. is also. Sent印eCies. former. species. central. allied Kimmeridgian. the. the. of. present. of. larger. is closely. species. (D'ORBIGNY). and. -form. by. present. to. a. species,. but. tⅠ1e:Shape. Th･is species is Well observed. iJn internal but the outer sp. character, dep･resSed than in the latter. are. n.. As,hikita-gu･n･,.. Kimmeri/dgi胤n.. lip.. establish. shallowly East of Igo-misakir,. Limestone. hightria･ngul･ar-shaped. moderately columel-1･ar. and. Kumamoto. lens. in. the. about. 2 kilometers. north. Prefecture. upper. Sakarnoto. formation;. of.

(24) 32. T.. Subfamily. SHIKAMA. Ptygmatisinae. Ptygmatis. GIYU-M-62,. Materials: directions.. Two. Mr.. K.. Measurements.-. are. Heigbt. 42. GIYU-M-63. /. 34. Shelllarge, wborls･. and. comparatively. rapidly. but. unknown,. wide. depressed. are. not. as. with. least. at. high.. tapers. 18. Outer. slightly. wall. toward. the. or. of. ; the. former. the. upper. one. than. the. lower. fold. the. jected;. keels,. three. The. tively.. of. the. middle. with expanded distal portions and. 3cm. yabei,. -M-62).. of sp･. nov.. Internal. Ptygmaiis. (GIYU. Two at. folds. columellar one-third. and. columello-basal projected. of. and. two-thirds. of. respectively downward,. one-. respec-. projected parietal. at. surface. strong. corner,. slightly. adaxial. pro-. at. labral,. of. situated. with. sharply. slender,. portion. keels. pro-. expanded. of. fold rather. two. sharply. situated. height. lower median. which. two. folds. palatal. parietal. from. abaxially. lower. the. two-thirds. and. also. smaller. of the. two. other. lips;. outer. folds. palatal. fold. palatal. which two. these. jected; third. of. the. on. portion keels. of. the. while upper. two. folds,. complicated. two. three. with. and Interior. rhombic.. distal. one;. obsolete,. abaxially. opening,. umbilicus. the. about. imperfectly. carinated. and. angle. low. aperture. narrow. rarely. shallowly and Suture incon-. region.. wide. of. expanded. one. volution. eminent inner and. the. on. or straight Apical apex.. sharply. presumably. consisting. Volution. each. a. conical,. more.. suprasutural Last and whorl. carries丘ve. three. spire almost. 月.at base;. aperture. structure. was. preserved.. spire. surface. preserved. 6.. longitudinal. along. GIYU-M-63. whorls. and. degrees. elevated. witb. 10. :. of. spicuous.. Text･丘g.. cut. preserved.. stout. sixteen. as. syntypes.. Width. 120. times. widely. as. 6). above. umbilicated, Lateral margin. precisely three. mentioned base and. 1832. nov.. Text一点g.. GIYU-M-62. undulated. 1850. (in millimeters). Description: about. 2,. designated. are. of apex TANABE.. No.. of. 1,. 1931. THURMANN,. sp.. yabei. 7, Figs.. specimens. Whorls by. collected. 63. SHARPE,. bruntrutana. Type-species.-Nerinea. (Pl･. YuI. PcELINCEV,. Ptygmatij. Genus. Types:. S,. and. lip, basal. near. of. fold.. robust, situated height from the ; the. stronger. lower. than. one. the.

(25) On. one. upper. distal. portion. and. and. that. by. upper. in. wall. of. projects. abapically. wide. present. from. The. latter. has. species. more. 10a.. more. to. France. in. fold. and. lens. impressed.. Last. two. sent,. basal. without. keels. fold.. except. Columella. thick. Remarks: tion. in Kumamoto. referable. to. with. [-sub-. presence. having. rather. of. conical. Pseudobruntrutana but. former. the and. um-. wider. (MoREAU, form. narrower. and. is. non. aspect,. umbilicus,. 2 kilometers. north. of. Sakamoto. formation;. in. very. partly. HeteroPtygmatis. subPyramidalis. H.. elegans. sp.. and. two. Five on. type. sp.. and. carinated. at. folds. eminent the. complicated with Umbilicus stage.. two. four. to. not. pre-. lips,. columellar. Juvenile hollowed.. :. nov.. one. present.. narrowly. abukumensis. H.. depressed.. canal. and. to conical highSuture feebly. slender. from the upper species Kyushu, the following central. to In addition Prefecture,. HeteroPtogmatis. parietal. nov.. sp.. penultimate. the. and. whorl. than. expanded. size,. deeply. to. anterior. folds. nov.. in. short. on. All. last. and. Ptygmatis the. general. orienialis. moderate. little larger. one. outer,. in. gently. sharply. P. gradata. upper. gen.. shallowly. a. rhombic the. on. to. surface whorl. Aperture. base.. large. Shell. turreted.. and. Kimmeridgian.. early. Type-species.-HeteroPtygmatis. Volution. Ad一. Prefecture.. in the. Heteroptygmatis. Diagnosis:. elaborate. which. folds. about. no. with. diameter.. thick. Carpatbia,. similar. almost. is penetrated. axis. by. and Ptygmatis. Kumamoto. Limestone. short is so. very. by. parietal of Igo-misaki,. East. and. whorl. complicated. also. Ashikita-gun,. horizon: to. without folds. of. eminent. Tanoura-cho,. Oxfordian. its is. Kimmeridgian. Loc.. Geological. by. of. doubt,. allied to of lnwald,. closely. latter. the. the. Occurrence: Uminoura,. late. Tithonian. present. from. D'ORBIGNY) the. the. from. distinguished. but. is. each Shell. has. fold. of volution. in the genus. species. complicated. species. swelling-like and. (Columellar plicae) end. 1940]. hook-shaped. keels. weak. the. on. situated have. four. umbilicus,. this. two. two. one-third. plication. place WENZ,. 33. widely. upper. whorl. about. interio-anterior. umbilicus,丘ve. The shell. GEMMELLARO. bilicus.. short. from. very. become. composing spiral. The writers (Ptygmatis). Nerinea. very. a. carries. Remarks:. is. keel. restricted.. narrowly. which. vohltion,. each. and. folds. penultimate. is very. which. with. expanded. all. the. umbilicus. swollerl,. genus. whorl. above. of whorl. wide. rather. last. those. the space. axial. In. of. the. while. fold. columellar. shape. but. lowest. the. downward,. abaxially. projected The pro丘1e. keels,. base;. near. Japan. in. keels,. three. with. one. Gastropoda. Nerineid. expanded. and. pentagonal. Some. nov.. sp･. nov･. Sakamoto species. formaare. surely.

(26) 34. T.. SIIIKAMA. S. YuI. and. All. occur species in the Koike above ･ef地e N乱kano-saga formation at S6ma City, Fukushirna. The. genus. <p柁S組rt. SfIARPE. larg.e. tO. whi,ch. are. easily. di-s･thguished. The. (1947). rated. by. absenceこOf. al､so think. STANTON. Eimportant from gerluS. element. YouNG. or. for. Piygmatis, to. PcEuNCEV. (1931). Plesioptyxis. PcELINCEV. Barremian Slender. folds. present. (two. Then血e basis. the folds. or. place. with. of the. slender. the from. folds. weakly. is. genus,. presしent slope. of. shell,. before. by. sepalmor-. the. Nerinellidae,. but. Multiptyxis. by. having. to. by. the. distinguished. and. Six. is. more. and. spire. genus. slender. m.re. VoLTZ, airigulensis Nerinea jleurianus. genus. Senonian. more. internal. seven. lip of aperture. and thick outer appear) Heteroptygmatis Ptygmatisinae on under. genus and. robust. shell, presence. of丘ve. complicated. along. longitudinal. arrangement.. Holotype,. Materials:. GIYU-M-64,. Two. 7,. Fig.. GIYU-M-65. above. mentioned. is almost. nov.. 3). paratype,. specimens. GIYU-M-64. sp.. orientalis. (Pl.. direction･. species. present. the. smoIOth. Among. type. is. be. also bears. genus. lateral. PlesioPtyxis. Heteroptygmatis. Types:. is. depressed. must. genus. Polyptyxis. species. with. conical. folds. is considered. umbilicus. present present. (1.954)wi,th. more. the. of. of Nerinellidae.. type. having. thre･e. d.eeply. of umbilicus discussed. as. element. The. genera. by. genus. writers. their. and. shell, folds･. in. former. the. less. absence. ･or. taxonomy'the. some. but. or. 1832,. internal. offive. keels,. character,. If this. distinguished. and. of. hShape the. internal. comparable. -smaller. ,and. simpler from. are. genus. than. clearly･. simil-arity. 1842,. pre告.ence. (1952).. phologlCal. D'ORBI:GNY,-. presence. Japan.. Piygmatis. umbilicus.. that. infrageneric. Multiptyxis 1931, and. and. shell. some an-a c､omplilCated with by its more slender shell, more. writers taXOnOmic. be. $lender. and. ir迫pOrtanLt. to. conical. the. of. to genus th･e morphol･ogical resembles Nerinea type印eCie-s bruntrutana THURMANN,. expanded. volutio‡1 Surface. member N㌻ortheast. Prefecture,. Shows. with -(-1850),. modera-上el. I.imestone. perfectly. are. cut. preserved. except. several. whorls. of. apeX･. Measurements.I. (in millimeters) No.. Height. Width. 66. 19. GIYU-”-64. Description: ten. whorls Pleural angle. where lying. or. twice. almost broadly. Shell. as. depressed it becomes on. the. Spire. more･. of. penultimate. a. almost. swollen. slowly whorls. high･. as. wide to. in size,. m､oderate. Outer. straight broad. 7. mid. gently ridge･. consisting. tapers. degrees･. surface. the or. conical. regularly. about. little below. and. slender. and. of. height. volution. :each except. toward. Volution. in. depressed.. Sut･ure. Last. strongly. whorl. of. about. the. apex.. rather. low,. deeply. and. last whorl inconspicuous,. near. carinated. at.

(27) On. rhombic. with. two. the. two. palatal. labral,. the. lower. the. and median. obsolete, at. situated. keels of. the. which. the. while. upper. lowest. one. pr′oJeCt･S. two. parieto-collumella anterior early. last. and. the. stages. folds. other. is. chambers. from. distinguished. in. MANN) has. the. thicker. of. Loc.. Geological. folds. 10a.. South. to. Materials:. Three. 7,. Figs1. wノeak. space. and. of whorl. whorl･s.. Pl･es･ioptyxissimilis former. the. is. clearly folds･. complicated. and. (THURhowever,. r･ather. 2 kilometers. about. in. vide. north. of. Prefecture･ in. the. Sakamoto. upper. sp.. nyov.. 4-6). y. de･sign-a絶d. speci.men岩. usually the. volution. of. (upper layer). l. are. three. lbruntrutana latter, The. fukushimensis. (Pl･ GIYU-M-66-68. keels,. Kim血eridgian･. early. Heter坤tygmatis. TyPes:. but. Kumamoto lens. four. with. obsolete. Senonian. lgo-misaki,. of. Asbikita-gun,. Oxfordian. side. base,. becom･e. fold. arrangements･. 且at. more. or. rSmaller and Ptygmatis. with. their. ,and. Limestone. horizon:. ; late. formation. haviⅠ唱mOre. columellar. columella. Of preceding. like. aspect,. and. comparable. shell,. Tanoura-cho,. Uminou.ra,. by. is al･so. stouter. umbilicus. Occurrence:. form. the. vhich. of. Two. mi･ddle. hence. whorl,. loo･ks. of. keels,. three. portion of it, The fold of near parietal low two keels on its with. thoISe. with. of height. delicate. the. palatal. upp′er. Of. distally. and. folds, lips.. delicate. keels､,. disappear. last. species. lat･ter. the. shape. and. compared. general. species. present. The. one-fourth with. sharp. fold. each. toward. present. in. (1954). of. weaker. The. with. hook-shaped. volution.. broad. ComParison:. The. of. become. rather. PCELINCEV. keels. other. expanded. abapically distal portion.. at. the. on. projected. from. from. highand. All. surface,. expanded. situated. corner,. two. height. of. projected,. shortly. high,. eminent. thr.ee. sharply. two-thirds. and. carries. distally. tvo. almost. five. at. with. Ape･rture. canal･. lower. rand. other. one. other. and. distally. lower. the. alld. the. one. parietal. expanded. expaflded. while. wall. 35. Japan. siphonal. Interior. upper. JSmall,. one-third. the. respectively;. the. at. thick,. the. on. aculte,. one. one. folds. one. upper. short. lip.. one. columellar, ftolds, situated. a. with. outer. thin. rather. in. Gastropoda. Nerineid. ()f its b･ase,. abaxialmarglnS. on. Some. as. ･syntypes･ are. abov/e. mentioned. cut. along. 1()ngitudinal. direction. Measurements.-. (in millimeters). No.. Height. GIYU-M-67. ･44. Shell. Descripiio陀: whorls. Spire straight. or. Apical. more.. regularly or. Widtb. 35＋. GIYU-”-66. tapers. slightly. concave. in. moderately arlgle toward. of the. inward･. 15＋. :. 3 whorls. 10. :. 10. pres､erved.. whorls. si諾e, turreted,. several. ealrly. of. apical. part.. consisting. whorllS. about. of 色fteen l√o 'de宮FeeS.. apex an■d its la.t､eral margln器官enerally low Volution two-thir舶 about father.