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(1)Miocene. Chelonia. Japan. of. By. Tokio. The Tesio,. is. by. col一ected. was. Palaeontology, were. to. the. in. is. But. Series,. have. we. not. desmosiyli an. part. its precise. able. SAITq. and. Of. above. its. and. the. of to. or. horizon. Trionyx,. Neogene･ by. regarded. nor. Trionyx. MATUMOTO. be. tO. formation) stored. (IGPS. coll.. all Japanese the. in. their. age･. 1945,. If Asiya. several. from. weight. Group. MAT.. Group), is of. belongs. to. the. Lower. 1953, tlPPermOSt. the. present.. horizon. but. di庁erent. are. it. as. NAGAO,. yabd. S.. MuRATA ash3'yaensis Group to be Lower. Asiya. Miocene,. time;. age,. Burdigarian).. to. Trochamm2'na regard. that in. still regarding. (Aquitanian. Lower. and. ･At. Crassaielhlies. mention. Geology. of. Group. are. the North. of. not. Oligocene. Asiya. others. as. they. Geoemyda. say,. Miocene.. of fossil chelonia､. specimens. In. to. as. of. by. represented Miocene. Sasebo. cat... did. 58526).. no. from. coal-丘eld. authors lnstitute. the. age. and. Lower. in. Miocene. Kyusyu･. SEIKAMA. it. both. geologists. geological. iakasago. Tikuh6. in. in. specimen. by. (Geoliemys). is. KIEARA,giving. (Geoh'emys)A iqkasage. kiharai. turtle. and. Tsukushian),. places T.. in. (occurring. of. Palaeogene. late T. NAGAO. University. concerning. (his Lower. Northern. horizon. precise. geologists･且MATSロSHITA. Oligocene. Since. composed and Kotanbetu. to. horizon. IwASAKI. lsikariof Palaeogene formations Thus etc.. is. the. mud. (Yamage by. treated. opぬiDnS. some. Miocene. trace. sized. The. T6boku. Group'was. while MuRATAand. almost river. it belongs. Group. locality.. R･. survey. is. Miocene). to. collected. was. Palaeontology,. among. recent. its. &. to be Middle Miocene regards in Hokkaido by many geomade Cretaceous formations. composed of. T. sinensis (WIF.GMANN). MATSUMOTO described Geoemyda. It. recently-,. and. of. of Asiya. Kyusyu.. the. whether a large. is. MAT.. In 1929,. Asiya. been. yet. ancester. basal. to. of Y. SASSA,. It. and horizon. Desmoslylus. of Opirausibets. upper. of. Japan.. Geology. locality. precise. locality. the. province. in. chelonia lnstitute of. the. its. TAEAI,. which. Tikubetu-(Lower. determine. to. even. formation,. of Kamikinebetu Opirausibets of the. tributary. Poronai. F.. of I(amikinebetu,. river. area. stored Although. After. according. logists, the Each. a. of in. the. fossil. suggestion, regarded, after H. YABE's Desmosiylus ToKUNAGA of japonicus. that. Ⅰ(otanbetu. to. age.. and. from. 1918. record. now. University.. Rumoe-gurl.. mentioned belongs. S.YAMANE. aS. Opirausibets,. the丘rst. as. MATSUMOTO. sameL. MATSUMOTO,. desmosiyli. known. T∂hoku. unknown, be. Tn'onyx. on. report. Hokkaido. SIIIKAMA. occurred. writer. of Yunoki. in. described formation. the. coaトfields Senryuemys of. Middle.

(2) T.. 36. Sasebo. Group. small. sized. was. in. very. by. 1954. characteristic. K･. KINOSIiITA,. Nagasaki. form. and. NoI,A,. M･. Prefecture･. T･ YAMAZAKI. coal-field). The. horizon. bed. of. I(isima. NAGAIiAMA. and. T.. SuzuKI. it to. regarded. and. EIPhidium. from others Prefecture (Karatu. be. AsANO. may. which. T･. to. according. is. KIⅢARA, Asiya. to. correlated. Sari. is. Group.. H･. fauna Group the foraminiferal of Kisima reSearChed AsANO & MuRATA Aquitanian kishimaense ; Pseudonom'on. satioi. SEIK.. quarry. Group,. sandstone. and. this. of. is,. it. of. and. Saga. Higasi-matuura-gun,. Oti-mati,. quarry,. This. specimen. another. 人. sandstone. kiharai. Emukae-mati,. mine,. coal. bears. species. reported. sari. Senryu. at. Sbikama. MuRATA. &. horizon. the. occupy. are. So. abundant･ Basal-. of. Senryuemys. that,. Middle. to. Miocene･. The <. Sari. from. specimen. Saga. Imari-city,. mura,. on. Dec.. is, after. the. in. sixth. H.. here. he. has. to. come. in. Miocene sp.. T.. cfr･. NAGAHAMA. MuRATA. and. T.. S口GAWARA. of Sasebo of Sasebo. formation the丑ora. 丑ora of Aniai. the. supported Yuda, Desmosiylus. by. many. T.. TANAI. authors･ Ninohe-gun,. Kindaiti-mura,. ToK･. &. IwAS･,. KIHARA, Sasebo. Croup. iaieiu,ai. T. ONOE. as. Setibaru. from. 61. species as. in. Miocene. is Middle. Miocene. locality. tyPica. NAGAO･. S.. KIfIARA,. formation. Lower. is. Cyc-lima Siraioria. and. determined. Prefecture. Desmosiylella. Glycymeris. T.. fauna. of Yunoki. Middle. as. YoK･,. (MAE･). foraminiferal. coexists. NAGAHAMA,. as. indicators.. time. Group. and. H･. graviiesta. formation. Iwate. Group. Osirea. the月･ora. henceforward maiuuraensis.. mollusca. as. and. regarded. but. Miocene. Proioihaca. of Ainoura Sasebo that. opinion. T･. regard. HATAI,. Miocene. reported. als･D that. jaPom'cus. now. Significant. Very. coal-丘eld. Group and. type,. nowadays. aS. Sanzyaku. Biological Labora-. the. Sasebo. of. SAITO,. some. mentioned NoMURA &. informa-. the. Geoclemmys. resembles parts. others. in. Senryuemys,. RI. Pl.lay iioi MAKIYAMA, etC.,. it. MATSUMOTO･ and. specimen. Matuura. the. also. Setibaru-mati,. is, according. (stored. resembling. tomiddle. ONOE. the. mine,. just above. harbour,. basal. T.. the last of which than. is. and. Sasebo Group･ H･ of upper for study, and are the writer they In 1953, the writer maiuuraensis･. to. Sasebo. formation･. horizon,. same. coal. horizon. Matuura. of Yunoki. the. Matuura. Geoclemmys. as. in. chelo-. fわrmation. that. from. OTUKA. sized. coal mine･ below the. It is larger. lying. shale. the impression. matsumoriensis. siraioriensis. a. specimens. from. TANAI,. 3'apon.3ca KAMAI'A,. Hence. these. japoncus. age.. small. Okawa-. Its horizon. University,. Its. of Setibaru. species,. ranges. SuzuKI,. from. Prefecture･. Household). have. Brachyodus. with. discovered. part. new. Imperial. Maiuuraensis. T.. a. in. a. part. kiharai. Kyushu of Geology, of fossil chelonia･. the. specimen. of the. tory. as. uppermost. Senryuemys. MATSUSIiITA,. basal and occupies MATSUSIiITA Submitted. the. is. found. engineer,. gallery of Senryu grey Shale, 30cm. occupying. with. bed. mentioned. KIHARA,. and Nagasaki. lgiven by. described. the丘rst. was. Kitamatuura-gun,. mining. of T･. specimen. another. a. of. Departmert. just mentioned, tion. dip. coexists. the. possesses. IMAIiASE,. (coal seam),. specimen. stored. T.. information. bed. sanzyaku This. the. station. in Tatikawamining. stored. Prefecture･. 8. 1941,. fossil in. nian. is, now. quarry. in. famous. in. the age･ is. age. for. Ontoceius.

(3) Chelonia. Miocene. the. visited. writer. inthe an. lower. the. occupies. rich. the. archaeologistinKindaiti, fossil possessed for study. This. chelonian writer. cutting. road in. question. and. many. by. is composed. of dark. of Osirea. remains. of 1951, fossil at a. chelonian. to submitted university.. zawa. of H･. guidance stone. upper most. In. the. on. the. summer. upper. 1954, the. of. of T6zyo. Group of Yatuo is It Miocene. the丘rst part. five species. known. bed. the. site. of Tomari. of. Kana-. of. the. under. tuffaceous. sandlocality. this. member, Upper-. belongs. chelonia. to. fossil in Japan･. cbelonian known. are. the. formation. marine. of chelonia. professor. black. to. Kurobe. say,. a. visited. of grey ITIEARA,. mudstone. is to. that. ･･. then. writer. M･. to. According part. a found Prefecture bank river, of the Kurobe The specimen prefecture･. right. It is composed. con-. and. sandstone. a. ToyLama. HAYASAEA,. throughⅠ.. writer. a. (Middle Miocene)･. Toyama. Simosinkawa-gun,. the. the. found by and bore the terraplne. site. でate. to. Of Uozu-city,. scarp. remains･. the. Nowadays as. terrace. TAEAYANAGI･. plant. with. is probably. graviiesia. TAKAYANAGI. Aimoto-mura,. Aimotosin, was. H.. it. to. concreations calcareous sandstone with fossil itself is YoK･ The terrapine. grey. belongs SaⅡdstone formation Kadonosawa. concretions of marl bed glomerate of Lower. June. The. TIle. kind. In. sized Yuda･ of. afine. see. submitted. terrapine. large. a. tributary丑oor. a. at. worker. is. to. chance. who. engaged IwASAKI･. of T･. guidance a. Of Yuda,. ITSUEAICIiI. specimen. the. have. could. writer. E.. Under. district･. of Ninohe. survey. geological. of Yuda 1953, the. fossils･ The formation molluscan Group･ In the summer of part of Kadonosawa was K･ TINZEI S. TAKAEASHI locality with and Who. (?) and. KELLOG. oxymecterus. 37. Japan. of. from. Miocene,. Japanese. the. folloⅦ･s : Emydidae. 1.. (Geoliemys). Geoemyda. ･･. ･. Group. ･･BasalAsiya. ; Lower. (?) (Fl).. Miocene. 2.. MATSUMOTO･. iakakasago SHIKAMA-.･-Sari. kihwai. Senryuemys. formation. yunoki. Middle. of. bed. sandstone Group;. Sasebo. Lower. Group and of Kisima to Middle Miocene. (Fl-F2). 3.. Geoclemmys. sp･. maiuuraensis. Setibaru formation and Miocene (F2-F3). 4･. Geoclemmys. of. sp･. yudaens?･s. ; Middle. tion. Miocene. nov･･. formations formation･ Yunoki ･･･Ainoura Sasebo Group; Middle Lower to Middle, ･･. bed. nov･･･････Tate. Lower. of. fo;ma-. Kadonosawa. (F2-F3)･ Cheloniidae. 5.. Kurobechelys. of Tomari. tion. Here mrs,. to. hl'm. gen･. Member,. the. to. writerwishes E. ITUKAICIil and H.. IwASAEI, and. iricarinaia. for M.. others,. Also. study.. ITIHARA, who. sp･. Upper. extend. his cordial. Drs･. valuable. thanks. T.. Mrs.. Y･ help. SASSA, in. to. submitted KIHARA, K･. preparing. forma-. mudstone. ; Uppermost. kindly. Who. thank should I･ HAYASAKA, him. T6zyo. nov･･--Upper Yatuo Group. TAKAYANAGI he. rendered. &. Miocene. (G)･. Dr. H. MATUSIiITA, their. specimens. S･ TAI(A‡iASEI,. AsANO, this. T･ paper･. MATUMOTO. T･.

(4) 38. Shikama. T.. ORDER. Testudinata. FAMILY. Emydidae. Geoclemmys. (Pl･ 3,丘gs･ト3, Ⅱolotype:. Geological. A. Senryu. small. coalmine,. gypsum. model. sized. shell. stored. in is. of which. discovered. in. model. in. the. is in. the. stored. of which. Dec.,. on. 1949. by. T.. IMAIiASE. Kyushu of Geology, lnstitute, Yokobama. Geological. the. mine,. coal. Department. the. 1-3). text-figs1. A. Paratype:. sity,. 1-3;. 4,触s･. from Matuura shell discovered Kyushu University, of Geology, gypsum lnstitute, Yokohama National University.. Department. from. Pl･. now.. sp.. maiuuraensis. UniverNational. University. Localities. Nagasaki. Holotype. ･･. Prefecture･. Nagas-aki. gun,. ”. Diagnosis. 1ateralcorner. end. Description :. 126. long. as. same. Paratype. both. hard. marly. surface. and. is. plate,. of. sasebo. =. Matu-. Groub). Group.. -sasebo. and. plates inguinaトand posterior. and in. anterior. of. in. at costal. axillary. Sutures wbicb. of. are. in. height. a七色rst. shell high, oval. portion. coloured. of and. in. general outline, longitudinal median. right. and. left side. are and plastron buttrsses･ Anterior. it are. posterior. is black. in height of thid neural plate, 33 mm bind Shell is at of sixth neural plate. direction, hence side of posterior. original. of carapace. end and. claystone･ some. height. Of dorsoIVentral. All. :. in. than. the. anterior. and. sized, not 135 mm in original. broken. portions･. among. plates. aw･ay.. The are. thinner. of it becomes detached; inner mould portion right marginal Plastron is also broken. coIISists mould of dark grey impressed the mould upon. cracked.. small sized, not high,I oval in general length 56.4 mm in lateral of cara･pace,. 30･8mm. seam. high, short, unkeeled. not. matrix丘11ing. Shell tudinal. of Middle. of carapace. moderate. 37mm. thicker. of shell retains. away. formation. portion. The. Shell. pressul･e. becomes. of carapace. marginal. away･. point. by. portion. the coal overlying formation of Upper-. Shell. preserved, probably about in lateral at middle width. 115mm. deformed. directly. terrapire.. sized. posterior. preservation･. the. bed. of Setibaru of Yunoki. horizon. broken. are. 丘ne in. at. Shale. :. Holotype. length,. Kitamatuura-. lies in nuchal Third scute fourth vertebral plate. and broader Sixth to eighth posteriorly･ neural plates much long･ Median intervertebral point of scutes projected forⅦ･ardly. so as in that of reevesii. of xiphiplastron not sharply projected. than. mm. Kitamatuura-gun,. offirst become. plates. plastron. Setibaru+mati, coal mine, Senryu Emukae-mati, coalmine,. and xiphiplastral small. region short, pygal plate and gular scute broader than long･ Vertebral broader than long. Anterioscute. Entoplastron. Posterior. :. horizon. Medium. :. Epi-. neural broader. (basal. :. Uppermost. :. region･. Paratype. Holotype. :. Sar]･zyaku. Paratype. Matuura. Prefecture.. IIorizons ura. :. neural. plate.. outline,. 50. mm. in. median. lVidtll at middle of third Shell is not defbr皿ed.. longineural.

(5) Chelonia. Miocene. 39. Japan. of. Carapace. carapace pairs. consists. Nucbal. of peripberal･. 9 neura】, 1 pygal,. of 1 nucbal,. bexangular. plate. 8 pairs. of costal and border much. anterior. with. ll (?) con-. longest long in holotype, border 19･7 mm of forwardly; posterio-lateral caved in long holotype ll･8mm border and straight ; posterior nearly all borders, than broad･ longer all borders First quadrate･ neural curved･ gently ･plate broader than Second distalwardly. convex neural plate and gently curved NUB. MSl. Pl. MS2. P2. MSS ･ペtヤ. P3. MS4. Nロ. P4. LSl. Cl. Vl. MSS. 〆三￣. Nl P5. n'丘q･1-･･ff N2. C2. V2. 封S6. 烏 V. ど. LS2. C3 'JLt. P6. N3. Fp･･,ぎ. ･･.>ヾJJ`上1'.∼.--. C4. n4S7. V3. N4. S. ,Y >.. N5 C5. P7. LS3. C6. i. V4 P8. MS8. ○. N6. ㌔. Ⅳ7 LS4. C7. MS9. ヽヽ. Z9. ヽ､､,:>. N9. ヽ. ′. ′′. ′′シ′ ′. ヽヽ. ∼. ■軒.. ⊥. PIO. _._..一-I-. 1.. Carapace. ■一一. _. Pl 1. Texト丘g.. MSIO. I. 守._---1･ ′ベン′ AqSll. AqS12. (holotype). of. Geoclemmys. maiuurae21Sis. sp･. noi･. NU. Cl P4. Nl N2. C2. P5. C3 C4. P6. P4. N3. P5. N4. P6. C5. N5. C6. N6. P7l. P7. P8. Text一点g.. 2.. Carapace. N7 N8. C7 P9. C8. (paratype). N9. of Geoclemmys. P8. P9. maiuuraensis. sp･. nov･. ,.

(6) 40. long･. broadest. with. all. borders. of all neural. straight. m印ral. plates trqneated ;all. corners. of fourth rangular seventh. curved. anterior-. plates. with. trapezoidal,. and. Eighth borders･. broader. posteribrly. of neural. plates. bolotype; are. borders. posterior. than. Neural ､. it not. so. plate. anteriorly. ; both. anterior. and. smallest. much. longer. and. plates. of paratype Posterior border. points･. straight ; both posterio-lateral broader much than long and in. corners. its. not. both. broad. with. of丘rst ; sixth. anterio-lateral. as. second. lateral. and. of all neural than. broad, borders.. straight di鮎rent. are. trunc?ted. neural. corner. plate.. from. those. neural. plate. neural. plate. not much Dimensions. :. Holotype. I旨. Nucbal Neural1. JI. 2. IJ. 3. II. 4. ′I. 5. 6. II. 7. II. 8. JJ. 9. ”. L:. First. and. subquadrangular and posterior both anteriorborders and posterior and Fifth neural long, quadthan plate broader are a little convex distalwardly. Sixth and than long･ trapezoidal, lateral-, with straight. neatly. as. Third. aftwardly. both. neural plate Ninth neural. straight. Pygal. truncated. concave. hexangular,. plate is broken aⅦ･ay･ following of holotypeinthe. and subtrapezoidal forwardly, lateral. borders. nearly straight･ alld all borders of which broader neural plates much truncated･. corners. plate, col_leave. broad,. as. lateral. neural longest,. border. posterior. neqral. irregularly. sixth border. ; anterior. while long. as. as. plates. truncated. corners. nearly. fourth. not. Shikama. T.. I旨 i旨 I旨 I旨 i旨 †旨 I旨 †旨 I旨. Median. Paratype. 25. 2士 39. 4. length.. 16.8mm 23. 3. 16. 8 14.9. 7.8 8.3. 12.0 14. 1. 7.6 9.8. 12.5 13.7. 8.0. 12.0 13. 8. 7.4. 12. 3 14. 9. 7.0 7.0. 10.0 16. 0. 6.0 8.0. 8.6. 7.4. 8.8. 5.0. 15.0. 8.0. 7.2 ll.8. 4.0 7.7. 13. 0 ll.9. W:. Maximum. 7.0 10.0 width.. by nuchal･first costal plate is bordered and second neural, second by丘rsトto fourth costal and irregularly peripheral plates; broader quadrate, than long and its anteriorborders and posterior running straigb ; its distal border curved convex gently and Second outwardly･ is bordered costalplate largely by second proximally distally neural by fourthplate and and丘fth periit becomes broader distally･ pheral plates; Fourthand sixth costal plates also become broader distally, while third- and fifth costal become broader plates.

(7) Miocene. costal. 41. largely. by. is distally. becomes. Sixth-. plates･ buttress. to. third-. eigbtb. occupies. posterior. distal. occupies. follows. costal. portion. plates. portion. of丘fth. of丘rst. costal. Costal. 1. 2. 3. 4. 5. 6. TL. :. PW:. Peripberal. inner. peripheral. axillary. of. costal. inguinal buttress plates. Left. 40. 5 14. 0 26. 0. 40. 0 13. 8 29. 4. 22.0± 8.0 16.8. 22.0士mm. 41.7 10.0 16. 0. 42.7 9.5 15. 8. 23.3 6.8 9.0. 23. 2. 45. 3 12.9 12.1. 45.3 13.0 12.0. 24. 3 7.7 6.2. 24. 5 7.8 7.2. 46. 2. 46. 0. 26. 0. 12. 4 16. 8. 12.3 15.0. 7.0 9.0. 24. 0士 6.9 7.8. 45. 9 14. 2 13.0. 45. 8. 24. 2 7.5 8.0. 23.0. 14.8 12.5. 41.6 10. 2 19.8土. 43. 0 10.5. 22. 9 8.0. 22.0. are. 10. 0. plates side. longest are. general and. smallest side. plate border. plate. and. gently of has. hind. straight a. curved. 15. 0 2.7. in. measured. direct. line.. width.. width.. are. with. curved. 15.5 3.0. preserved.. unpreserved. sixth,. from. shortest. First. and. border∴. anterior. plates,. quadrate,. inwardly. from. to ninth of left side.. eleventh. peripheral posterior. Second-. posterior and little longer broad than convex. to. straight. anterior-. and. follrth,. at. eighth. anteriorly.. all peripheral. is subquadrate,. irregularly. hind. a七色ftb, is broken. outline,. 18. 2. 9.9＋ length. bolotype. and. 7.0 ll.3. 5.8 6.8. 5.0. and. and as. of. left peripheral in. fore-. Measured. 7.2 7.8. ､6.6. (10.0＋). maximum fore･. 7.8 8.0. 18.0 5.5. (24. 8＋). 5.5. Transverse. 7.3 18. 4. 10.6. 10.3. Distal. ):. of right. trapezoidal. pheral. and. plate Dimensions. plate. Paratype. I,;i †5w: Igw: †5w; ‡5-: †5w: i;,kw iTskw Proximal. DW;. (. carapace. ninth. In paratype,. Right. (21.B＋). 8. plates. costal. Left. (26. 8＋). 7. with. and. distally.. 甘olotype. First. Sixth. :. Right. eleventh. to. third-. by. costal. plate.. of. are. plates eighth neural 丘ftl1- and sixth periare bordered costal plates. bordered. broken. are. borders. to. costal plate Distal borders to eig･btb of fourthplates. by sixtムーto tenth peripheral plates respectively. broader is distally bordered by eighth much and. pheral largely. as. bordered. ar9. plates Third. respectively･. Japan. of. distal expansions alternate of proximaland holotype in than Proximal borders paratype.. proximal1y.んThese distinct in more･. eighth. Cbelonia･. and as. third. long. borders, on. while. plate is border. as. anteriわr-. and. peripheral broad on. Fourth. carapace. sub-. side;. and. periits post-.

(8) T. Sbikama. 42. borders. eribr. Fifth peripheral is also in like fourth straight. plate its dorsal border-strongly outline of dorsal side; projected. is nearly. size. and general inw.ardly. Sixthis broader. than. to. eighth. long,. with. peripheral. jected. Peripheral. inwardly.. fourth. broadest borders. to. of. ninth.I. all plates,. are. gently. Dimensions. with. fifth. and. their. dorsal. peripheral. borders. generalノOutline,. plate. on. preserved -are-. plates. pro-. both. sides. largest. and. ventral plate.. :. Paratype Left. Right. Left. 6.8. 7.2 17. 4. ･i琶 2if 惇 1f †宣 ‡宣 7†宣 8仔 9†宣. peripheral. their crenulated, while lies in seventh peripheral. follolVS. as. Holotype Right. Peripheral. seventh are. buttress. are. plates. and. of paratype. Axillary. curved.. of peripheral. of sixth-. plates. Fourth-. in. all qnadrate. anteriorstraight and posterior and ･borders Dorsalborder of sixth peripheral plate is. nearly. genJtly･ curved peripheralborders. irregularly Ventral border curved. from. plates,. mm. -. 17.3. 3. 4. 5. 14.. 11.0 14. 5. ll.0 14. 8. 12.1. 14. 5. 10. 4. 12.0. 14.3. 15. 5. 12.6. 12.5. 15. 7. 16. 2. 18.0 14.5土 12.6. 17.3 16.8 13.6. 8.5 9.8 9.7 9.2. 16.0 16. 0. 15.0. 9.0. 8.9 8.8土. 13.2士. 15.2土. 8.7 8.2. 2＋10.. 8. 13.. 6. 6＋12.. -. .0 8.8. 10.0 11.0. 9. 8＋6 9.8 9.7. 15.5± 18.3. 19. 8. 4＋9.. 2十5 8.8. 2. 15.0 19. 8. 17.. 8.. 17.0±. 18.0. 17.. 2. 8十9. 15.3. 15.8 16. 2. -. .9 士. 12.0＋9.4. 9.0. 9.0土. 9.9. 8.5 9.7. 19.0. Length. along. border.. L. ventral. in. The. :. dorsal. Proximo-distal. border.. P. length. :. 9.2. 16.0. 8.8. 8.7. 7.8. Length. alollg. fore. along. 9.0 10. 0. 19. 8 0. 15.0. D:. 7.6士 8.2±. 土. periphery.. border.. Dorsal. V:. side. Length written. along. γentral. in. left. and. right.. precise. istics of each. outline scute. is unknownin. of scutes. in holotype. are. as. follows. General. paratype. :. Nuchal. scute. character-. is largely. broken..

(9) Cbelonia. Miocene. First. vertebral. scute. curved border. lateral. gently lateral. is nearly. of Japan. Median. 1y･. is. of丘rst ･costal plate. Second scute vertebral. than. long,. with. little short of the centre of posterior posterior end of lateral sulcus lies near. run sulci, which up Posterior of nucbal plate･. border. little broader. a. pentagonal,. 43. a. portion. of posterior. broader. sulcus. long,. than. anterior-. projects. hexagonal,. irregularly. much convex distally and median sulci of which moderately portion of posterior feebly Posterior lies near sulcns end of lateral sulcus projects anteriorly. border posterior third Anteriorrun and posterior of costal plate･ sulci through. lateral. first- and to. the. third. second.. second. vertebral portion. of the. is broader. than. median scute convex. former. througheighth. vertebral. First. widthジ. lateral. has. gently. curved. and. third. lateral. sulci ; posterior nearly. straight, while be trapezoidal.. 4 27.0. 30. 7. 34. 0. 35. 2. 33. 5. all lateral. ; posterior. them that. of third Dimensions. Ditto. of. outer. sulcus *. At. sulcus*. right. unpreserved,. 2. scute,. 24. 5. 30. 0. 28. 0. 42.. 5. 42. 7. 29. 0. 29. 8. 35. 4. γentral. sulci･. to. llintb. twelfth. marginal. 17.. -. 1. 16. 1 _. _. marginal. scutes. quadrate, ; and. sulci broader scute,. in. broad. are. than. longer long,. irregularly. than. has. unpreserved,. wholly. unknown. has gently inwardly. Second. to one outline broad･ Fourth gently. quadrate,. partly At. direction,. projects. simi1aringeneral. unknown,. partly. scutes. lateral. eminently. wholly are. scutes. are. scutes. marginal. marginal. pentangular border ; proximal. Fifth. mm. -. line.. fourth-,丘f紘一and. trapezoidal,. scute. Left. Right. 25. 8. intermarginal. straight irregularly. Left. 33. 9. sulcus. have. scute. 4. 8. scntes,. inner. {. 33.. and seventheighth marginal from to twelfth ninth-. marginal. and Second. :. 3 Right. and. third. trigona王. follows. as. 39.2. tenth-. 0十. sulcus of second Fourth lateral. 40.8. direct. mm. 34.. straight. has curved. 38.8＋. in. costalplate.. {. Left. curved and. ; posterior. Right. and丘rst-, sixth-, First marginal scute, peripheral. long,. 40.5. periphery, and from. left periphery,丘ftb-,. than. 36.0. Measured. post-. -. 33.5＋. width of inner. nearly. {. Left. convex. broader. ′irregularly. gently curved. lateral are scutes of. 1. Length. is. scute. {. vertebral. 5. being. sulcus. inwardly. convex. -. scutes,. broader. and. quadrate. of and. moderately. eighth. 3. Rigbt Maximum. of. 24. 3. scutes,. of. part. 2. of. plate. :. 25. 9. distalsulcus. part. posteriorly,. fbllow･s. aS. becomes. 1. largest. scute,. sulcus. that. ; 1ateralsulcus. plate. 27. 0. to. seems. arS. SCuteS. length. anteriorly. ; posterior. neural. unknown. in. neural Fourth. liesinproximal. corner. eriorly; anterio-lateral Dimensions of vertebral. Maximum. scute,. throughBfth. hexagonal. allies in shape. than. outwardly. projects. irregularly. scute. vertebral. convex runs. eminently. long,. running. anteriorly, Fifth outwardly･. Median. Third. neural plates respectiveiy･ Left lateral sulcus is more Posterior scute･ sulcus. curved as. long. as. another,. marginal dorsal- and broad, has.

(10) T.. 44. dorsal long,. sulcus irregularly has nearly straight scutes,. all marginal gently. curved.. Sixth. marginal. sulci.. Seventh. marginal. irregularly. scute,. is largest. has. sulcus which ventral Dorsal stllcus of ninth marginal. of marginal. scutes. are. follows. as. Length. Width. along. sulcus. of. {. 2. II. 3. II. 4. II. 5. II. 6. II. 7. II. }I. ”. ………. ‥‥.‥‥. Left. 6.8. 15.7. 8.4 15.7 13.3. ‥‥‥‥.. Ditto. of plastal Side Left. 12.4. .……‥. 21.0. 16. 0. 20. 7. 12. 1. ‖‥….. than. mm. -. 9.0 12.5. 9. sulcus broad,. {. 7.4. 17. 6. ………. of. dorsal. Right. Left. 10. 0. 18.5土. 8. largest. sulcllS gently curved. Dimensions gently.. curved. 7.8. ….…‥. …‥….. dorsal. along anterior carapace side. Right. 15.4. 13. 8. ‥‥…‥. and longer. {. Right 1. be. be. than. :. periphery*. Marglnal. broad,. as. to. seems. scute. and to. seems. broader. quadrate,. trapezoidal,. nearly. of all sulci. sulcus. scute. long. as. quadrate,. Eightb甲arginal. curved･. Shikama. 20. 0土. 8.2 ll.7. 10.4 6.2. 13.0. 7.0. 11.4 *. in. Measured. direct. line.. Plastron. toleoutline, is丑at with ventral surface of bridge oval, in general Holotype is broken broken both too paratype rably curved. anteriorly and former measures 85mm long the along median anteriorly and posteriorly; Plastron. ′一---. -￣T. 七ノ. Ep∴. ′′トー･. ､-よ. ､tT､､. Bum. -y′′Ent. ヽヽ. ′ I. ･-I. LL･.I-,-L)<･･. Pee. IIy. Ab. ⅠIp. Fem. Ⅹp IT_′′‥. >r､. All. ＼. ノ. ＼. ノ. ＼. ノ ′. Text-fig1. 3･. Plastron. (holotype). of. Geoclemmys. maiuuraens2's. sp･. nOV･.

(11) Chelonia. Miocene. longitudinal probably the latter or. so. it Ⅲ1ay. 37. wide. along of. parts. rhombic,. broader. long. along. fore. border. irregularly. be. in. Dimensions. truncated.. Epiplastron,. are. border. transverse. has. Ditto. with. Ditto. along. inner. Ditto. along. posterior. Ditto. along. outer. border. Measured. in. *. convex. Hyoplastron, posterior. and. border. Left 31.Omm 24. 0. border‥… border. direct. be. :. border#. anterio-outer. and. anterio-outer. border. anterio-inner. of. mm. to is. which. inner-. straight. 51. seems. Right Lengthalong. ;. and. width･. posteriorly. follows. as. ;. entoplastron. posterio-lateral. is truncated. border. preserved,. Entoplastron. long,. than. as. sulcus. broken･. maximum. sulcus. pecto-abdominal longitudinal median. length. along. original. are. with. broader. ;anterio-inner. much. and. 24･5mm. pentagular,. wide. bypoplastra･. of. 45. Japan. longitudinal. median. long. than. mm. 100 m皿in. hyoplatsron. ri宮bt. it may. aftwardly;. 103. and. preserved, been over. have. mm. anterior. borders. as. sulcus. of. 24. 9. 26. 8. 44. 4. 43. 5. 31.0. 32.. 1. line.. innerbroader than long, has straight pentangular, is gently border bわrders ; posterio-inner curved and posterio-outer and anterior as are border Dimensions border truncated; exterior projects outwadly.. Hypoplastron. irregularly. follows: Right. Length. along. Ditto. along. Ditto. along. posterio-inner. Ditto. along. Ditto. outer. XL. Measured. as. follows. border. 58. 9. 57. 8. border‥‥-----. 31.0. 31.5. border*. 29.2. 24. 4. 19. 0. 18. 0. ‥‥---------. border* in. subqudrate. posterior-. 41.0. posterio10uter. along. xiphiplastron, anterior-,. anterior inner. exterior. and. direct. as. and. Left. 43.4. border. line.. long. borders. as are. broad,. has. Ditto Ditto Ditto. Precise follows. unknown;. part. along. along along along. largest. are. Left. inner. and of. anterior inner. border. border. ‥----------. border. posterior. outerこborder. 31.0. 31.5. 24. 5. 23. 5. 15. 7. 16. 6. 31.2. 32.2. in paratype. They is unknown outline of scutes : Neither large anterior nor part of gular scute it seems to be broader long and than quadrangular. sulcus. of entoplastron･. long,. :. :. Length. straight. border. Dimensions. curセed･. gently. inner. straight. Right. as. mm. slightly. ; posterior. Pectoral broader. all sulci, pro]'ects. sulcus scute. inwardly, anteriorly. nearly. straight,. irregularly has at. straight otltSide. inner. holotype. in. are. numeral. shortest,. with. much. sulcus. of its middle. posterior. broader. ; posterior point. is. scute. through. runs. quadrate,. mm. than sulcus. ; posterior.

(12) 46. T. Sbikama. outer. corner. outer･. peripheral. scute. are. of sulci. to be. seems. bordes. lying. tolerably. on. border. outer. of hyoplastron.. forwardly･. concaves. Right inner. along. Ditto?long Ditto. anterior. sulcus. of. anterio-outel･. Dittoalong_. posterior. Ditto. Outer. alollg. Abdominal than. metwith. portion. preserved. ill direct. 21.9 16.3. ”..... inner. ; posterio-outer. 49. 8. 24. 3. 20. 4. in. outer. surface. and. border. peripheral. pentangular, is. sulcus. plastral. curves. gently. irregularly. scutes,. sulcus;. sulcus. sulcus. 50. 0. line.. of all plastral. straight. 10.4mm. ”..... border*. ‥‥. intermarginal. sixth. as. Left. 14.5. ‥.‥.. _sulcus Sulcus. ; abdomino-femoral. otlter are. has. preserved. Peripheral. largest. scute. long,. as. sulcus. 港Measured. plate. sixth. inner. along along. outer. Ditto. along. posterior. of. Femoral. scute. curves.. posterior. and. Inner. long,. sulcus. becomes. and. posterior. Ditto. along. outer. Left 22.0. 27.0. 27.8. border*. 32. 2. 31.. 0. in. direct. long,. than. has. Dimensions. curves.. gently. reel)eSil'GRAY, ･is very. plate;. along along. Ditto. along､outer. shell ; epiand. inner. Ditto. This. neural. and. ouト. gently. are. as. 18.7mm 15.6. border‥‥‥…‥…‥‥‥‥‥…. 16･9. 18･O. by are. regions,,. sm耳11 sized; entoplastron. belong. it may. species anterior. medium very. to. lateral. is broader. corner. than. sized. short.. long;. by. and. gular. entoI. Compared. the following. of丘rst. relatiyely from. Judged. Geoclemmys.. is distinguished. :. Left. 16. 1. is characterized. sulcus;. follows. 18.7. ‥.…. xiphiplastralregions. the present. inner. straight. border..‥...... sulcus. posterior. species. mm. line.. broader. and. border. .. Right. Remarks:. border. outer. 20.8. stllcus. Measured. trapezoidal. Lellgtb. broader. Right Sulcus.. along. outer. than. ; posterior. sulcus. 35.0. 15. 5. :. Ditto. scute. mm. line.. broader. and. inner. along. *. Anal. direct. quadrangular,. Lerlgtb. 35. 2 borderX･..‥‥. Peripheral in. Left 33.0. 33.2. ... sulcus港‥..‥. Measured. and has straight Dimensions are. wardly. sulcus#. posterio10uter *. nuchal. its. at. Dimensions. aftwardly.. 34.9. sulcus......... Ditto. Ditto. plate. peripheral. anteriorly. Right Length. plastral. and. crenulated. of. projects. concaves. and. follows:. as. broad. of pectoral. :. Length. broader. Anterio-. Dimensions. points. vertebral scute. ,. with :. scpte. pygal lies op. is very. small;.

(13) Miocene. 47. Japan. of. is not. is not sharply pointed ; and carapace of xiphiplastron is clearly From the present species region. yudaensis,. end. posterior at. Chelonia. costal. distinguished. broader size,A relatively shorter shell, relatively much smaller Contrary by to inter-lateral and not sulcus. undulated丘rst. by. reevesi2',. third-. and. The. writer. species.. fourth. neural. plates. it. regards. as. a. new. Geoclemmys. (Pl. 5,丘gs.. Science. Pl.. 2,. to shell belongs Yokobama lnstitute of. Geological. broader. scute. vertebral yudaensis. and in. posteriorly. this. species.. 1,. 6,丘gs,. now.. sp.. yudaensis. A. IIolotype: the. 1,. becomes. keeled. 2;. 4,. text一点gs･. E. ITSUKAICHI,. 5). National. of. model. gypsum. University. in. and. is in. which. National. the. Tokyo.. Museum,. Type･1ocality: Kindaiti-mura,. A. Ninohe-gun,. Ⅱorizon:. Tate. 350. tributary月.oor, lwate. sandstorne. bast. m. of Yuda. Primary. Yuda,. School,. Prefecture. and. bed. conglomerate. Kadonosawa. Lower. of. formation. Diagnosis:. keel. no. at. Large. sulci straight interlateral ; second. broad. ; entoplastron. f()rwardly. convex. Descrip. tion. Anterior. bed.. the. in. and丘ne. the. carapace-. by. 丘rst-. to.丘iftb. right. peripheral,and. from. costal,. large. at. the. is. in. the. a. ･in. except in. pro-. longer sulcus. ヽvbicb. concretion in. black. to. sulci of median Anterior deposits. right. to. plates. of sixth. fourthanterior. to. in. of epiplastra,. outline,. moderately. seen. posterior. neural,. from. to. sixth. fourthcostal, from left peripheral･ ninth. portion. is. buttress. of sixth. are. portion. preserved. portion. anterior. portion. are. of. colouration. dorsal. and. grey. yellowish. of clalcareous. brown. are. It is. away･. is. posterior. Plastral portion. xipbiplastra･ oval. lateral. same. in. of. kind. a. plates. sutures. first neural. and. sized,. 206mm. height. plastral. but. alsoinfrom. preserved plates are bypoplastra and of. about. and. interior. the. broken. are. of shell. portions. marly Carapace brolこen Surface.. of nuchal,. Shell. sulcus. scutes. portion.. of hard. coating. anterior. portion. third･. sulcus straight vertebral broader than long ; pectoabdominal. posterior`. and. preservation. obliterated. with. than. :. marginal-. The. longer. -neural plates interlateral portion of丘rst. the matrix丘11ing petri丘ed, and that the specimen marl, indicating. much hard. on. at. vaulted,. moderately. ;. subrhombic,. its median. oval,. fourth. and. ; innermost. jected forwardly than. Second-. reglOn.. costal. Intervertebral. Shell. terrapine.. sized. point.. in. width. general at. middle. Perhaps. the. third. of. scute,. vertebral shell. original. vaulted,. is about. 270mm. measures. in. 96mm long･. Carapace. carapace and. ll. (?) pairs. latersal border. of 1 nucbal,. consists. of. peripheral. 32 mm. is about. 8. (?) neural,. Nucbal long. and. plate gently,. 1. 8 (?) pairs. (?) pygal,. may. curved,. be. bexangular; while. posterior. of costal posterior. border.

(14) 48. T.. Shikama. NUB. MSl. Pl MS2 P2 NU. /. /. Vユ. /. ヘノ. ′. MS3. P3 I. Cl. ′)･p:(-･町も,. ･. Nl. LSl. ㌔. ∼. .. 且IS4. /. ∼ ∼. 3. c2. ∼. P4. t> thともヾゝ†'Jt'J. 7. ㌔. ＼. N3. ∫. Ⅰ一S2. C3. P5. MSS. ill:LIT>,t･J. l. .QY,I,,#-I--∼-㌔岬瑠' 11... MS6. C4. N4. P6. ”. ､か･. tヽ>r･…--.LやIW3･T･17くThqL,. I.･杓叫. I.rt>. P八くJ'. MS7 N5 C5. LS3. ⊥∼T仁一lこ!･L. ..∫ ∫. P7. /. N6 C6. MSS. Y. ･t叫p1''Yh>t,'. i..V 4. ノー. I. ｢. I,. N7. ＼＼. ＼. / ′. L. P8 ▼′ ヽ. ヽ. MS9. ′′. ｢. ヽ. I. / ､､. ′ヽ.. ･･,ノ､く. ＼. ′. ..⊥,. ＼. ′′て.ーくヽ. ′. LS4. ll. 一■一l. ′､-.__.. 7. ヽ､. V5. `. ∼, ヽ. ･,I. ヽ. ヽ､､､. ′. MSIO. ､､､. P9. ー｢-一 -.. ､ー､…11'￣￣. ､_. l. ヽJ_I. Plo pll. Carapace. Text一石g･ 4･. is 16mm. neural. long plate,. broad. than. very. of. in. obsolete. in. their. ceeding with Sixth. plates gently. neural. 丘fth plate. neural. plates. borders. known. plate, Posterior as. Nucbal. Neural. only. neural. -. in. plates. outline,. but,. plate. than. ; their. they.. L. i li 2i 3†. allied. to. all unknown. mm. 76. 0士. L. 33. 0 26. 8土. W……‥…‥‥…‥…‥‥. 28. 0 30.0士. L. 23. 8. =‥…‥‥‥‥‥‥‥‥‥‥. W‥‥…‥….‥‥………. in. third their. truncated. with. outline. First longer. to. its. ante-. is. neural plate quadrate･ borders runalmost straight. may be shorter portion, than. ー. ‥‥‥‥‥‥‥….‥…..”. from. assumed. Fifth. …‥…‥…‥‥‥‥‥‥‥. =‥…‥‥‥……‥‥.‥.. nearly quadrate, border. Secondand. quadrate. W…‥.‥‥‥‥‥…..…… W‥‥…‥……….…‥…. 1ユnknol和.. is. fore-&-aft. its anterior are. nOV.. is. when. elongated is. sp,. outline. follows.･. L. ”. be. neural. be longer. lateral. curved. are. to. precise. outlines. to. costal borders, neighbouring lateral Fourth corners. anterior. yudaens2's. anterior. crenulated. seems. seems. its. its posterior. irregularly obsolete. but. Geoclemmys. anteriorly;. projects. rather and has. plates,. neural. and. MSll. _,-/I. MS12. 29. 7士. sixth.. Dimensions. of.

(15) Miocene. 5. 49. W. 32.8士 26. 5. L. 25. 0二L:. W. 27. 8士. 29.9. W. L:. Median. length.. Maximum. W:. width.. by to second neural, second plate is bordered nlユCbal,丘rst丘rst- to fourth it is irregularly peripheral plates; quadrate, long, and has posterior border distal border running straight ;. costal by. and. broader. Japan. L. 6. costal. of. L. 4. First. Chelonia. than. much procostal plate, bordered by fourth丘fth distally Ⅹimally by second neural plate and and peripheral broader distally. Third plates, becomes costal plate, bordered much proximally by third neural broader distaliy by丘fth plate and peripheral plate, becomes curves. gently. distally.. convexes. and. Second. Fo11rtムー to sixth costal. costal plates second Fonrtb by their corresponding neural plates. distally by sixthand partly by seventh peripheral. than proximally and narrower bordered are much proximally costal plates, costal. is much. plate,. becomes to. bordered. plate,. to. comes. broader bordered. broader. median. seems. much than. mlユCb. by. dista!1y. much distally.. broader. and. seventh. distally. becomes. eigbtb. Dimensions. of costal. 2. 3. 89. 0 土 26. 0 ± 32. 0. 93.0士. 93. 0 士. 90.0士. 30.0 22.2. 29.0土 21.5. i i:w: I:w: I;,w: I T;D:a. TL. PW. :. Transverse. :. Proximal. 士. DW:. First. to. of left third second. fore-. plates. plates. proximal plates. Fourthto second,. seems. Third sixth. bind. and. bind. and. peripheral. peripheral. peripheral. straight than. second. Distal. length. maximum fore-. plates to. be. be-. plate. follows. ;. mm. 86. 6 22.7 43. 2 73. 9 26. 6 16.6 76. 0 in. measured. direct. line.. width.. widtb｡. ate. broken. are. the as. oblique unknown,. 24. 0± 34.0. 26. 9 土. 6. and. Left 83.6士 33. 5 70. 0土. ]二 23. 0 土 37. 5 土. 5. plate. are. Fifth. narrow. much. plate;. plates. 81.0 士 34. 2 70. 6. 88.0. 4. rnn. costal. peripheral. ;,kw. 1. borders. Of sixth. outlille. by. distally.. is very. plate,. posterior. Right. Costal. broader. peripheral and. Posterior. line.. bordered. costal. ; anterior-. proximally. longitudinal be. third. and. right. spatulate. peripheral peripheral. Anterio-distal. unpreserved.. plate plates,. and. third have. unknown･. curved. is subquadrangular. quadrate,. much. portions First-. and. distaト and. broader. and longer. than.

(16) T.. 50. long,. has. fourth. peripheral Dorsal. borders.. posterior. borders. of sixth. Seventh. are. peripheral. Dimensions. and plate. gently. peripheral. than. shorter. nearly. broken. is largely. plate. are. plates. of peripheral. posteriorly. and. follows. as. than. shorter general. 5. 6. Length. D:. border.. in. and. left. Nuchal. L:. is. is nearly. tbrougb. the. sulcus,. allied. in. hence. the. neural. to. plate.. line. rather. than. the. scute. is. the. di位cult. angle. in. anteceding. entirely. of. longest. in. than. but. seems. broadest. and. Dimensions. unknown.. posterio-inner. corner. widtb. irregularly. sulci;. sulcus has. corner. portion;. to at. be. the. strongly. slightly. of vertebral. all. sulci. slightly. cur＼7ed･丘fth tbrough. its. outgeneral broader relatively. Fifth. portion. are. scutes. as. vertebral follows :. 3. 1. 2 51. 3. 52.9mm. 61. 8士. 45. 0. 46. 5. has. outwardly,. projected. hexagonal,. its middle. trapezoidal,. nearly. posterioalso nearly straight Third is also scute vertebral. posterior neural plate, and broken is scute posteriorly, and. assume,. scute,. posterior. lateral. median. runs. which. haxagonal,. portion.. median its. lateral sulcus,. broadest. plate;. and. sulci. but. third. scutes,. peripheral. written. broad,. nuchal. longer. second;. Maximum. lateral. along. side. broken. scute,. slightly curved. Median1ength. First. Length. Dorsal. border.. 6. 2＋23.. V:. peripbery･ fore. along. its median. vertebral to. 28.7 33.8 36. 7 30. 4＋25. 2. 6＋21:. vertebral. with. through. Fourth. 29. 5 33. 5 33. 3 31. 8＋26. 7. along. length. anterio-lateral. runs. sulcus. Length. First. is broadest. plate. 0. 31.7 36. 2 34. 0＋23. 0. 9. 35.2士. scute,. broadest. and. 5. 8十19.. 28.0. 35. 32,. P:. unknown.. and. mm. right.. vertebral. outline. Anterior. border･. posterio-lateral. posterior-. 29.2 32.8. 31.. pentagonal. Second. straight.. Left. 28.7 27.0 28.. Proximo-distal in. γentral. scute. anteriorly,. curved 1ateral. dorsal. along. ventral. unknown･. outline. i2. 7. borders･. γentral. 30.2. 惇惇荏. 4. and. anterior-. :. Right. Peripheral. respectively･. its. while. its. of. ventral. while its posterior borders; anteriorand. and. plate gently straight ; dorsaト1ittle. its. than. curves,. curve,. peripheral. borders. γentral. longer. γentral. anteriorly. projected. and. dorsal-. curved. ; dorsal. corners. borders. posterior. keel ; posterior-. gently. of丘fth. straight. γentral. Dorsal. are. plate border. is nearly. border. longitudinal. median. strong. Shikama. posterio-innel･and shortest like anterio-inner sulcus; gently curved First interlateral anteriorly. sulcus projected. former.

(17) Chelonia. Miocene. Second. plate.. lateral. plates;. scute,. sulcus. sulci ; peripheral. straight; Third plate･. inner. does. corner. tbrougb. runs. gently. they. left nearly costal. pentangular,. not. is also. scute. to.eigbtb. are. scntes. curves. sulcus. situated. Length. of of. First-. {. Right. Right. inner. 30･7. 24･7. 56. 2. 54.6. 57. 3. 56. 2. suclus*.･･. 90.0士. sulcus.……‥. Measured. to. in. third-. anteriorly,. nearly. fourth. wbile丘fthlong. than. trapezoidal. dorsal. curved. than. right. and. ine.. broader. much. projects inwardly intermarginal sulci. anteriorly-. at. dorsal. on. of but. side on. scute straight marginal lies in posterio-outer portion. of sixth. portion. ; its. costal. inner. of scutes. are. right. marginal. portion. nearly. sixth. marginal. straight. dorsal. and. on. γentral. intermarginaト. inwardly. projects. peripheral a little. are. scute. side;. Fifth. sulcus. in. as. while. anteriorly. throughperipheral. runs. fourth. marginal. plate･ curved. corner. in median. corner. straight,. corner. of left sixth. that. sides ; anterio-dorsal. is broken. scute. lies anteriorly,. of fourth. be. to. seems. sulcus. posterio-dorsal. dorsal. γentral. than rather border of. scute･. Dimen-. :. Width. along peripbery. along. sulcus. ＋. of {. Right. Left 17.. 4. Rigbt. Ditto. anterior. carapace Left. side*. of plastral side*. {. Right. 8＋. Left -mm. 23. 4. Iナ. 5. 22/0＋. 30. 7. 6. 34. 0. 34. 0. 22. 7. 22. 5. 28. 7. 28.. 0. Iタ. 19.. 22.. 24. 8. 25. 2. 24. 0. 24.. り. 7. 2. *. Measured. 0十 in. 19.8. 2＋. direct. line,. ;. pentangular is broken scute. undulated. ventral. of byoplastron,and. Length. Marginal. fourth. posterio-inner. both. corner. and. plate,. Left. are. marginals. intermarginal. Sixth. unknown･. seventh. anterior. 60. 0. -. are. mm. 53. 8. -. scutes. dorsal-,. Left. -. and. peripheral plate; Seventh marginal. curved･. gently. posteriorly. sions. sixth. 86. 0. latter projected anteriorly at periphery･ inner intermarginal snlcus, and posterior. strongly. fourth. of. of lateral. ; the. IlaS Straight. scute. 91.5. marginal. straight. with. sulci;. one. posterior. -. directl. is quadrate. all of them. marginal. Left. 91.6. outer. gently. Left 81.3. scube. marginal. sulcus. strongly. 3. {. 79二5士. *. dorsal. sulcus. proximal Dimensions. width‥….......…. Maximum. 鮎th. and. carved. 2. R ight. shorter. anterio-. :. 1. and. gently. of. fourth. of. border. unknow･n･. {. Ditto. that. and. interlateral. on. is entirely. scute. peripheral. portion middle like second, but. plates ; third. corner. sixth. posteriorly to. costal. posterio-inner. and to. fourth-. through. second. of. anterior-. ; peripheral. peripheral. posterio-peripheral Fourth lateral plate･. costal. short. portion. pentangular. anteriorly. project. and. curved. has. sulcus gently little posteriorly. a. run. lateral. sixth-. median. runs. curved,. interlateral. right. second. to. little posteriorly. straight througha. runs. 51. Japan. of.

(18) 52. T｡. Surface. of scutes. is distinct. keel. to. owing. scute,. vertebral by. coating. and. longitudinal parallel to sulci･ Median bnt obsolete on the succeeding scutes deposits.. grooves. ヽvi地many. on丘rst. erosion. Sbikama. marly. Plastron. Plastron tudinal. sulcus. is Batand side. in. oval as. general. preserved. gently. 160. and from. slopes. mm. wide to. periphery. is moderately. of periphery. 170. measures. ontline,. long. mm. along. longi-. median. along. s1加us ;. pecto-abdominal. Ventral. longitudinal sulcus,. median. it. vaulted. ■-一-●◆=----I--------､. G. ′ ′/. .._I. .,･･. Ep flt!Trl. ヽ＼ヽ. Er)I,. ′ ′. ヽ. 也廿-･･v1.Tt.PITYI汁`カ. 丑IS4 fry. J. P4. /. Pee. ･d･F叫-吋1斗AQb･与∼塙叫. MSS. ヽ'J,d･･y′-:h'{,ik}. P5. 冒ど. MS6. 声丑p. Ab. P6. I. 一き;i.. 丸IS7. 抑句中-触h･_耕1.･eq-,. P7 AS /. Fen. ∫ / ∫. ＼------一￣ー. ヽ､一一ヽ. ヽヽ､､､. Ⅹp ′ ＼. /. l'-I-1･t･L･L-､. ヽ. ′ ＼. ヽ､. ′ ､r･･･. ′. ､_. ､-ノ. ′ ′. ･､､. ､ゝ-L}･n-,,,''/′ノノ -一■_. -I.. 1. 5.. Text-負g.. Both with. epiplastra inner-. straight. 32･Omm broader. on. both. borders･ sides,. posteriorly, Anterio-lateral. lateral. tolerably. Hyoplastron borders,. nearly. anterio-outer corner,. curved. Length. and a. little. subquadrangular. posterio-inner. and. postrior-inner. border. along. 41.2. is. noも.. ; epiplastron. subrhombic,. wide. sp.. narrower. long. mm. concave. gently. with. measures. anteriorly. longitudinal. median. along forwardly. and. while. posterio1. posterior. aftwardly.. outer. borders, contacting. anteriorly. Entoplastron. is irregularly. straight. broken. yudaensis. mm. border. convexes. ▲■. -. Geoclemmys. of. irregularly. is 46･O. sulcus･. outer. much and. posterio-outer. curved. and. are. Plastron. --･. the with. pentangular, border and last of which epiplastron,. straight. inner-. and. irregularly. curved. anterio-inner-. with with much is much. concaves. forwardly.. pro)'ected. anteriorly,. AnterioI while.

(19) Miocene. the. that. one. depressed. contacts. with. Chelonia. is plate and line. Dimensions. peripheral bordering. sharp. Japan. of. 53. by. occupied are. inguinal. follows. as. :. Right Length. along. Ditto. of. Ditto. along. Inner. Ditto. along. posterior. Ditto. along. exterior. Botb than. straight. in. Dimensions. are. Length. scute. axillary. border. along. posterio10uter. along. exterior. Humeral. stllcus; outer. sulcus. gently. sulcus. is nearly. which Anteriorandinner. along. outer. along. posterior. as. as. direct. gently. Right. Left. 84. 5. 85.0. 51.0. 55. 0. 31.5. 48.4. 53. 4. 54. 7. outer. and. posterior. along. Right. Left. 20.4. 21.8mm. 47. 0. lnner. inner-, straight nearly straight being longest sulci, the last of which. has. pentangular, posterior. curve. irregularly,. Fourth. intermarginal. sulci. sulcus.. Dimensions. Sulcus. Ditto. along. posterior-outer. Ditto. along. posterior. *. Measured. as. sulcus. preservedX.. sulcus. sulcus*............. in. direct. 41. 0. line.. of posterio-onte￣r. anterio-outer. :. 41.3. lie in byoplastron.. along. vbicb to be. posterio-. and are. ……‥‥‥‥‥……‥. posterio-outer. and. Ditto. sulci,. of entoplastron.. part. are. Right Lellgth. line.. mm. seems. preserved…‥…‥……=…. curved. corners. portion. inner. through. rnns. preserved3e. irregularly. Anterior-. posterio-outer. and. sulcus in. with. anterior. bordering. sharp. lie anteriorly to centre of entoplastron, it. Dimensions to scute of ゎumeral. sulcus. Measured. scute. preserved*.. sulcus. Ditto. anterior-and. with. border, Posterio-. scute right scute; has inner shortest, quadrangular, straight same in as length the and nearly posterior. curved. corners. Ditto. *. and. longer. line.. straight. inner. along. as. scute. lies posteriorly. of all sulci.. with. preserved. direct. elongate-triangular.. Pectoral. curved is depressed. has straight anteriorly, long respectively at. 24.5mm. 12.7 and. as. border. in. broken. scute. Length. be. may. nearly. border米. Measured. corner. 85. 0. outer straigh七 border. posterio-outer. with. border. anterior. Ditto. *. inner. 84. 5. Hypoplastron. posteriorly.. by. Ditto. measure. broken. anterior. Inner. along. Gular. 65. 7. :. along. Ditto. 8＋. 65. 7. line.. pentangular, borders, and. occupied. mm. 57. 0. direct. are. and. corner. outer. border. irregularly. also. 46. 8＋. border. Measured. inner-. Left. 0＋. 59.. border.. bypoplastra. wide,. 44.. border*. ant.erio-outer. *. border*....... anterio-inner. is. scute. line.. …‥‥‥‥. and. anterior-. sulcus :. Left. 52. 0. 53. 6mm. 41.. 45. 0. 8. 35. 3. 35. 0. 77.2. 80.2. meets.

(20) T. Shikama. ･54. Abdominal inner-. with丘fth in. sixth. peripheral. of abdomino-femoral being. longest. Length. Sulcus. outer. Ditto. posterior. along *. Femoral. long. straight. outer-. peripheral. in. inner-. peripheral The. Remarks:. Japan;. in. Japanese. longer. come. may. is depressed. 1.5. species. but. present. its. at. chelonia to. 7,丘gs･. (Pl･. formation. formation upper. the. scarps. is. which. has. triangular,. through. runs. plate. and. hypoborder. toranterior. of Tomari. of Yatuo. of. all the. judged. from. the. Geoclemmys.. secondat. and. It. ever. recent. aspect. differs. fourth. neural. of from. plates. intervertebral. region;. costal. exterior. a. fossil terrapine. largest. innermost portion of while interlateral sulcus straight ; portion,. other. new. species. while. abdomino-. Altbougb. portion.. the. iricarinaia. sp.. 8,figs･. text-負gs･. and. 1-3:. by. owned. lnstitute on. right. Toyama. tuffaceous丘ne. part. Pl･. Geological. Terrace. Grey. :. of. species. the. of names. and. writer. Geoclemmys yudaensis.. Cheloniidae. 1, 2,. Simosinkawa-gun,. Horizon:. mudstone. in. :. with. discovered. shell. :. quadrangular,. last. of which. at its median. it as. regard. Kurobechelys. Aimoto-mura,. to. keeled. forwardly. convex. the. straight, nearly forw･ardly ; second. FAMILY. of w･hicb Tyt!p-locality. be. peripheral. question,. belong. is not. projects. is inclined. A. 64. 8. largest. the. times. in. now. forwardly. the. is stored. 72. 9. 63. 5. posteriorly. be. may. near. carapace. convex. Holotype:. sixth. neural regions, following characteristics. sulcus. he. sufBciently,. 65. 4mm. 73. 2. elongate. sulci, former. the. third;. compare. Left. sulci,. scute. tbrougb. may. sulci not projected 丘rst interlateral sulcus. cannot. inner. specimen. forwardly. pecto-abodominal femoral sulcus. Axial. of scute. The. in. which. plate.. it. and. than. left scute･ curved. present. terrapines.. entoplastralreel)eSii GRAY. curved. of which. portion. of. Right. to. outer. gently. with. latter. and. portion. former. 67. 7. seems. ; scute. posteriorly. at preserved irregularly and. plates. of seventh. and. intermarginal. exterior. line.. direct. broken. are. ; posterior. plastron. known. as. …‥……‥‥…=‥=………-‥‥-. meets. are:. scnte. of abdominal. straight. curved,. sixth. and sulcus forward : the. convex. sulcus*............”.”.”..,..””.,. Measured. straight. with. sulcus*. scutes. 33.Omm. are. Inner. irregularly. and. Pecto-abdominal. has. quadrangular,. sulcus. byoplastron. moderately Dimensions. of all sulci.. Dittoalong. having. sulci ; outer. plate.. sulcus. along. scutes,. o'f all plastral. nearly straight posterior in intermarginal sulcns. and. sulcus. largest. scute. H.. 6,. TAKAYANAGI,. of Yokobama. bank. of the. 7). National Kurobe. river,. Plastotype University. Aimotosin,. Prefecture.. sandstone. member, Group.. nov.. of probably. corresponding. upper. to UTIO's. part. of To^zyo. Nanpo. siltstone.

(21) Chelonia. Miocene. Small. Diag:nosis:. lateral. vacuities. so. not. much 8. broader. anteriorly. ders.. broad.. than. Both. Hyo-. another.. of the. elements light. brown. Carapace Nucbal. on. of shell. on. 20mm beigbt. of. progress. 51. about. measures. sides. and. been. are. marginal shell is. The. marked.. on. side･. right. are. broken. also. general. outline. length. been. of right. large. it. shifted. original. broken. away,. direc-. dorso-γentral as. shell. lateral. as. about. hence. are. may･. second long. 300mm. as. is. latter,. in. compressed as. Surfaces. plastron･. elements. that. Be. posterior as. the. marginal. longitudinal. acute. Plastron. neural plate･ to also declines As. on. Shell corrugated･ in maximum and 167 mm. eminently. third. highat. have. distally. carinae. in maximum. mm. of. any. and. clearly. distinct. three. ventral. unknown･. mm. may. shell. original. and bypo-. of. up･. very. and. posterioly. longitudinal. have may plastron of fossilization･. and. carapace. tioninthe. one. specimen. agaln. side. are. stllci. distinct. carapace,. shell precisely. not. could carapace. turtle, tlat, has. 218. posterior. left from. to. from. Toxochelys･. of. and. about. at. width. and. the. as. Neural plates all unpreserved･ When fully the restored, plate･. two. dorsal-. both. sntures. marine. and. measures. lateral. both. sized. carapace. preserved. longer. inner-. spine. median. bor-. and. quadrate. are. seventh neural be like those may as. its. with. anteriorly,. to. small. carinae. All. plates. peripheral. aspect. shell. interneural. on. large. as. be. but. lying. was. shell, which. colouration･ broken plates are. and. times. three. the specimen,. extracted. in. po占teriorly and. he. block. a. eXCaVated. block. the. broad. :. TAI(AYANAGI from. 8 (?) nuchal, becoming and. 1. separated Both another･. Anterior. spines･. many. plates ; their. plastron. one. with. united. bearing. of. elements. of carapace bicarinated of. nearly. with. strong･. and. DeseI･iption. left. and. bexangular,. scutes. hypoplastra. of them. long. plastron. right. and. borders. outer. respectively･ fourth vertebral. to. Second. plastron consists. than longer plates narrow, Ossicules be present may. Neural. (?) costal.. and. Carapcace. sculuptures.. vermiculated. and. neural. tricarinated. Bat. rather. border. Distal. lateral extremities･･. Carapace. highbut. Shell not. turtle.. marine. digital. and. undnlated.. has. surface. sized. 55. Japan. of. preserved Probably. scute･. and. 230mm. wide･. (?). costal･. Numbers. Carapace. carapace and. pygal seventh and. consists. borders wardly borders. neural. narrow,. 8. (?)＼ neural First. unknown･. All posteriorly･ 1ong'bexagonal they. 8. and. neural. neural in. plate as. plates. nearly. straight.. plates. Median. of interneural they. neural; are. as. are. in. may. follows. about. longitudinal. borders. be :. traces. as. of. a. kind. except. and. and. aft borders. the. latter;. are. of. broken. lateral. their. for-. concave. lateral. anterior acute. except. ossicules･. and. seventh broader. become. size:. is very. of. anteriorly. preserved. general. carina. preserved. is broken. outline. general. equal : forelongest borders and of all straight is generally broader than and the former respectively:. its portions. to丘rst. plate. are. eighth,. anteriorly. are. peripheral. neural. of 1 nuchal,. and in. strong. ;. posterior. Dimensions. of.

(22) 56. T.. Neural. 1. L W･･････.--･.････””･･････. 21.8十m皿 15. 0十. L. 36. 1 21.7. ‥………‥‥.…‥‥….. ‥‥…………‥.….….. 2† 3i 4† 5† 6‡ 7†. JJ. W L. ナナ. W. L. JJ. W. L. I〉. JI. ‥‥……‥‥‥……‥…. …‥‥……‥…=…‥‥. ‥‥‥‥‥‥‥‥…‥‥….. …‥‥‥….‥‥.………. 37. 20.. 0 8. 33.. 7. 22.7. ‥‥‥.……‥‥….……. W……‥.…‥….…….=. 34･1 22.7. L. 30.5. ‥…‥‥‥‥….....……. ‥….…‥‥…….‥‥…. W…‥‥‥………‥…….. L. II. 20.0. ‥‥‥‥…‥=….‥‥‥‥. W---‥‥…‥‥･･･‥‥…. Median. L:. Shikama. 20.0±. length.. longitudinal. Transverse. W:. maximum. ￣､､ヽ. ヽ. ----'--. width.. l l l. Nロ. ■:ニ･1:J￣￣----. vl. ､. ヽ. ヽ. ヽ､. l. ､ヽ. ヽ. ∫. ､ヽ､. ヽ､. __-(-.----71＼ NI. -1---ゝヽヽ. ∫. ＼ヽ. ､､. LSユ. N2. ー1 V2. .<. ′. /. I-,∫. {･ti!･. __一一ノ▼. J. >-. J. /. N. / ′. 3 l. ∫ 1. ∫. ∫ I. l. 1. I. I. C3. I l. 2. LS. J:. 1. 1. .i. 1 1 1 I. 1 1. 1. N. t l. t. V3i. l. I. サ/.･･;･14､. fl1.1 }. 1. r. I I 1. ㌢. N. 5. J J. ---I/. LS. C5 一 l. I l ＼一一■ (. I ヽ I I. J /. / ′. J /. .. ′′. ､---∼_/. ＼_一￣. N. C6. l I. 3. V4. l l I. I. 6. ヽ. ￣1.'Lb-･.･-∼.---･t･--･-I-1､./. ＼. rT￣-----_ー. 7 空色･j”JbL､--ー /. JL. ノヽ. ′′. ヽく′. ノ. 8. ヽヽ. ノ′. f!7J'..I LS4. C7. ′. +. ∴)､(-･､_ t.. '､<'.ノ. ￣､､､. l. ヽ､,､. -ー∴I_J. ヽ--メ-､ヽ. ヽヽ､､_ノ←--. Text-fig･. 6･. Carapace. of. Kurobechelys. irican･naia. gen･. &. sp･. nov..

(23) Chelonia. Miocene. broken plate is almost it is bordered by nuchal,丘rsトand. First anteriorly;. ; its. costal. plates Second curved. second. and. it has. distally.. Third. fourth. and broader. general right. third. quadrate,. plates, Fourth. and distally;. 丘fth. and. fore-. its. costal. costal plates. borders and. Being. aft and by third. broken second. is. becomes. broader. fourth. plates,. subquadrate. by. becomes. and. by. irregularly. than. plate,. gently. bordered. and neurallong, subquadrate, and bordered by fourth and丘fth. broader. costal. anterio-exteriorly,. is. third. and. is much. costal. third. first. forecurved bordered plate,. costal. is. one. by. broken. plate,. and. neural-. left. and丘rst. second neurals and be trapezoidal ; its posterior border. may. outline. costal. gently. proximally.. by. away. costal. right. 57. of Japan. second becomes neuraト broader. Fifth costal plate, running nearly straight. being bordered by fifth posterio-outwardly and and sixth neuraland by fourth has nearly and sixth costal plates, is subquadrate, straight fore- and aft borders, narrower becomes broader Sixth left than and proximally. costalplate, much and. borders. aft. proceeding plates, is quadrate, is bordered broader distally and. has. fore-. straight. by. sixth. and. seventh. and. its general. be. may. outline. Inner. spatulate.. end. of Except. borders,. /becomes. by丘fth■. neuraトand broken. is largely. Sixth right costal plate seventh costal plates. left costal plate is also largely broken, only its anterior. aft. and Seventh. away.. is preserved;. portion. bor,ders. intercostal. ]olnS. corner third costal, all ribs are with anterior-lateral of neural plates. broken left rib is preserved to its distal it gradually extremity; off. Third becomes 15; its surface narrower distally and bas丘ne parallel lines of above 8.2mm it measures 25.8mm long Periand wide at portion. about proximal. of costal. phery. is. Distal border w-eakly undulated. Two lateral longitudinal are carinae. plates. proiects a. to. outwardly. little inner than. longitudinal. median. Dimensions. longitudinalcarina.. median. line. of costal costal. of Right. Costal. 2. 3. 4. 5. 6. iTBw: TBw: † i5-: ig-: iS-:. of each. plate. distinct,. they. plates; plates. acute. are. as. obtusely and. are. parallel follows.I. Left 63.2mm 35. 0 41. 4. 35. 0. 36.. 71.0 37. 9. 0. 29. 4. 34. 7. 69. 4 33. 3 39.7. 32.7. 67. 5 33. 6 29.5 57. 3 29. 8 34. 2 46. 4. 7. TL. PW:. :. Transverse Proximal corners. DW:. Distal. fore. length foreof. neural. fore-. and. and. border｡. a.I.=DnW; bind. width. plate. bind. width.. measured. in. direct. line. between. run. anterio-lateral.

(24) 58. T.. Nuc-hal. is unknown･. scute. Seconq. scute vertebral has and quadrate, gently 1ateral sulci are longest･. third. neural. portion. plates. outline. and. median. lateral. corner. Fourth. vertebral. scute,. of. be. may. of. is. axis. in. scute. 4 58.0士mm. 44･9. 43.8. 32.8士. almost. l. Length. inner. of. Ditto. of. outer. Surface and. Ridges. and. median. longitudinal. grooves. anterior. --. distinct. from. across. of neural. 4. 67.2. proximal of. 63.2. 63.8. -. 62.8. point. and. of each. lateral. Left 46.2mm. -. sculuptures,. ridges. costal plates. longitudinal. into. converge. Right. IJeft. -. 70.8. outside. sculuptures. unposteriorly Dimenoutline.. 60.5. vermiculated. median. portion. is. sulcus. {. Right. 68.2. 70.8. 44.0＋. disperse. and lateral. 3 Left. -. of wbicb transversally. run. and. 52.0土. has. lSulcus lateral. Third. {. Right. periphery.-. plates. its. lateral. broad,. than. carina.. 2 {. Iノeft. -. sulcus‥‥=. of carapace. grooves. longer. and. as. :. are. {. ‥…‥... pro-. Second. straight.. and. are. here. First plates are described its irregularly triangular outer ;. Fourth lateral scute, sulcus･ to be subquadrate in general. consideration. third. median. 3. sulci. and plate.. scute. 67･0. is subquadrate. Right Maximumwidth. in. vertebral. longitudinal oblique median becomes broader anteriorly, and. subquadrate,. of lateral. sions. of. to. runs. than. lies. corner. plate. costal. 2. all sulci ; intercostal scutes,. fourth. of. in. second. neural. 66･5. be. to. to outer equal in length longer than broad, seems. almost known,. lateral. costal. seems. of all lateral. its transverse scute. upon. anteriorly,. largest. scute,. impressed. middle-･. much. and. proximal. like. little longer. a. Dimensions. plate.. at. portion is. median. is. tbrough丘托h. unknown,. first. lies in median. scute. runs. nearly posterior-. and. through. run. corner. proximal. its. costal. width. scutes. longest. sulcus. unknown.. hexangular,. elongate. sulci. vertebral. lengtb･------･-. Maximum. unknown. lateral. posteriorly. sixth. Median. scute･. Median. posterior. posteriorly;. Ⅹimal portion follows:. posterior. Third. largely. also. anterior-lateral-. and. lies in median. narrower. Lateral. sulci of which. plate.. size;. broad,. than. Anterior-. is. scute. vertebral. longer. much curved. costal. general. becomes. First. is. respectively･. of second. Shikama. carina.. point. along. between. hyo-. median. carina.. Plastron. Plastral and. not plates are hypoplastra, but both. one. another･. Epiplastron a. unknown. except. byo-. hypoplast-･a. away. end. and and. inner. of byoplastron. small are. periphery and. fully. united with each left elements right and and. entoplastron. of broken but preserved,. piece. of. right. posterior. side. except. other of them. are. unpreserved･ fragment of left their is buried. outer. elld of bypoplastron. one.. portions. in the. matrix. are. from. separated. Ⅹipbiplastron. are. more. Right are. and. is. left. all broken Both anterior. or. less broken.

(25) Chelonia. of Japan. of plastron. bear. Miocene. Both. away.. carina. as. that. so. respectively,. plastra Plastron. left sides. and. right. measure. preserved as. about. is abollt. preserved. in. plastron 161. in. distinct. Right. 180mm. and. long. transverse. maximum. longitudinal. median. is bicarinated.. general 175mm. mm. 59. left. and. ･respectively. width.. い I1. ′//,/4. -*､ tl. ll. I. ▲. ヽヽヽ ■●●. ′. ＼ -､l. l. Pec. tly. ＋･_E=F<?･'･=1tt/=}y>i. l. Ab. ⅠIp. †きl-i:;. Fen rLl ′. ･一tl. シ). Text一点g.. Hyoplastron, unites. which. as. minates. 30mm. long. and Both. anteriorly.. than. 8mm. outer-. seven. Dimensions. notched. Median. transverse. Transverse. Hypoplastron. plastron. to. become six. spines. is like. broader are. border. along. Posterio-outer. of border. byoplastron. border. in. posteriorly. preserved.. Median. longitudinal transverse. leng width. more. plastron, byoplastron. of. Rigbt. Left. 165.0＋. 99.0. as. preserved. outline At inner. Dimensions. in. and. are. along. carina…. 79.0土. 87. 5. 55･7. 57. 6. digitated. is. mm. fringlng, border. posterio-lateral as follows: Rigbt. Maximum. br9ader. fringed.with. are. left. measures. :. carina””......”....... posterior. ter-. anteriorly. becomes. borders-. border. posterior. Hyoplastron. anterio-lateral. anterio-lateral. nov･. sp･. inwardly,. widtb‥...‥‥…‥‥‥‥‥‥‥‥‥‥‥…‥ along. width. inner. inner. ler)gth. &. gen･. bending. and. its base.. at. preSerVed･ as fol一ows. are. longitudinal. Maximum. seems. are. splneS. tapering. which,. wide. and. At. digitation.. numerous. spine,. about. lricarinaia. has. outline, general straight Median longitudinal carina. bypoplastron･ median. <タ. Kurobechelys. of. in. quadrate. with fore. a. Plastron. 7.. Left. 56.0＋. 77.0士mm. 66. 2. 68.. 8＋. of. and left.

(26) 60. 1､. Shikama. A. of left xiphiplastron 22.2× 18.0 mm and about. plastron, Pectoral-,. abdominal-. left. sides. and. has. unsymmetrical. in. quadrate. lateral. general. sulci. slightly. Dimensians. Pectoral. longitudinal. Maximum. length. transverse. Length. along. ‥‥‥. widthうそ…. are. Ditto. along. proximal. border. Ditto. along. posterior. border. Ditto. along. distalborder*....”. This in. is. follows. Right. 82.0士. 78.4土. 55. 5. 53. 8. 79.0土. 87.5. 64. 5. 68.. 64. 5. 62. 0. (TEUNBERG) faces.. Eriemochelys. plastron,. plates. by. and. 1ng. carapace tO. a. 55.5士. 48.3＋. 42.6＋. 50. 5. 51.6. others Be. the. with. genus. a. and. new. have. and. AsANO,. K.. &. S.. Foraminifera,. 2). BIEN,. M･N･,. has by. CHOU,. MI. 1 M･,. BAY,. 0.P., no.. uncarinated. tricarinated. carapace. 5). sur-. bicarinated. and. scutes vertebral with strongly by relatively broader carapace Toxochelys, Cienochezys, Lyloloma,. by. the. more. writer. distal. undulated treats. this. turtle. border belong-. as. s. Foraminifera. of. Earatu. Coal. Field;. Fossil SinリSer. the. on. Pal.. Fossil. Pisces, C,. Amphibia γol.. Remains Sin.,. Turtles. of. North. no.. from. Choukuotien. 1.. Chinemys. of. γol. 3,. Reptilia. and. fasc.. 10,. from. Hsiatsaohwan,. Shihhung,. 1. America;. Carnegie. lnst.. Wash.. Pubリ. 75.. KIHARA,. T,,. minifera 60,. The. japonica. carapace. broader. Palaeogene. Pal.. Act.. 1908:. Chelom'a. and. it. forms,. marine. species.. the. Note. Anhwei;. Nortbern. 4). On. and. of tbe皿arine. (in 丁ap.)･. 3;. 1955:. 44. 2土. is distinct. 1956:. 5･. 1934:. Localities. 3). MuRATA, no･. mm. 39.5土. -. smooth. Referenee. 1). 63.0土. recorded. (EscESCHOOLTZ). it may,. as. 40.5＋ -. Japanese. recent. plates･ distinguished. that. the丘rst. as. noteworthy. are. 45.8＋. 68.8. line.. neural. plates. new. 63.0士. Chelone. narrower. Thalassochelysand or. 62. 0. distinguished. border･. posterior. projected. 64. 5. (GIRARD). squamosa. is clearly. but. 52. 8. 44.2＋. -. 8十. 55. 5. larger. Left. Right. 8. oliuacea. much. scute. {. Left. 66.. Careiia. both. are. is trigonal. Femoral. scute. {. 53. 0. is. in. lies. :. Left. direct. straight. scute. preserved. Right. Compared. Japan.. as. Abdominal. in. species. distinct･. clearly. …. the. of. scute. Measured. *. fossil turtles. …. has. anteriorly,. scute. as. border‥.. anterior. Remarks:. scute. corner. {. Median. and. right. qurdrate Posterio-outer corner sulci. Abdominal scute, also irregularly. curved. of scutes. their. and. is irregularly. outer. sulci; posterio-outer Femoral of bypoplastron.. outline.. Pecto-marginal-,. wavy. all. Pectoral. outer. portion. of left hypo-. end. known.. are are. of hyoplastron. becoming a little broader. outline,. wavy. posterior. scutes. another.. and. portion. general. and. posterior-. femoral. one. posterior-. posterio-outer. median. to. near. dimensions.. femoro-marginal. straight. lies in. in. and. abdomino-marginaトand. in. is pl･eSerVed. piece. no･. MuRATA, from. 709.. the. S. & Sechibaru. (in 丁ap.).. M.. SuGAWARA, Beds,. Sasebo. 1954:. On. Formation;. the. Occurrence Jour.. Geol.. of. Soc.. the. Jap.,. Fora･ γol..

(27) Chelonia. _Wiocene. 6). EIliARA･. T･･. 18.. 1955:. Map･. KリNoDA,. H･,. lmp.. Univ.,. 2,. ser.. 1926:. On. Some. On. a. -,. MATSUSEITA, Fac･. H･･. Regional. New. No･. Min･. 1;. Geol.,. 5,. vol.. no.. Explanation. Text. Geological. of. Fossil. Geology. Trionyx. Japan.. of. from. (in Jap.).. flokkaido;. Sci･. Rep,. T6hoku. Ibid.,. vol.. 2.. no.. Fossil. Cetaceans. Fossil. Ibid.,. Japan;. of. Land-Turtle. from. NAGAO,. 10,. γol.. Eocene. the. 39,. 1.. vol. Kyushu;. of. 13,. Sill., γol. 3,. On. the. T.. in. Iくyushu. Tokyo, M･. &. sonogiand 0Ⅰ(ADA,. Y.,. 17). OTUEA,. Yリ1934:. SAITO,. Poland;. of. the. of. Act.. Pol.,. Geol.. from. 5.. vol.. Tienshui,. 1.. 5,. JapリVOl･. Foraminifera. no.. Sasebo. so-called. Surv･. Kansu. from. the. (in 丁ap.).. Karatu. the. in. Group 8,. no.. Sasebo. and. (in Jap.).. Stratigraphy. New. a. Kyushu. of. (XVII). ;. Jour.. Geogr.,. A. Jour･ Geol.. Catalogue. R., 1956:. from. Structures. Paefecture,. Palaeogene. Relation. Soc.. Japan;. Proc.. Imp.. the. Problems. in. no.. Northwestern. Bull.. Japan;. Nishト. theAshiya, 715.. (in Jap.).. Japan.. of. of. between 61,. Jap., vol.. Vertebrates. of. Tertiary Iwate. Desmostylidae. of. Stratig･raphic. 1955:. Groups;. 1938:. Genus. 3.. no.. SuJAf(U,. Motlntainland,. Kyushu. Coal-鮎1ds;. (in 丁ap.).. Sasebo. 16). Kyushu. northern. Geol･. the. γol. 6,. Palaeng･ene. γol. 13, T･. On. Rep.. Sci.. 3.. no.. Bull･. ;. Eyushu;. Pliocene-Turtle. Part. 1955:. ; Ibid.,. Desmosiylella,. Acad. NoI)A,. Japan. SuzuKI,. The. the. Upper. Northern. .. Pliocene. the of. Pal.. 465.. 1937:. -,. from. in. (in Jap.). the. (in Jap･)･. Position. Kyushu,. Fields 1.. in. ; Act.. fI. &. no･. Coal no.. 1954:. Tリ1927:. vol･. vol.. 3,. Tortoises. CoalField,. Fields. coal. the. 2,. no･. Systematic. H.･. NAGAHAMA,. 24,. 1955:. China). NAGAHAMA･. geol.,. of. Unconformities. the. vol･. The. Sasebo. Geology. on. M･,. 1955:. (North. 18). 1954:. Region;. Univ.,. Again. MLYNARSKI, …,. 15). YAMASAE=,. a. 3,. vol.. 1949:. K6zangakkaishi,. 14). T･. Coal-field･. (in 丁ap.). On. New. Sci･ Kyushu. 1956･･. -,. 13). I(aratu. 2.. no.. 12). &. 1918･･. 1929:. -I,. ll). the. Tyubu. J･, 195o:. MATSUMOTO,. 10). M･. Prefecture.. Saga. of. MAEIYAMA,. 8) 9). of. 61. (in 丁ap.).. K=NOSli∫11A･. 7). Research. Japan. of. Earthq.. Japanese. Res.. the. End. of. Inst.,. vol.. Kitakami. 12,. 3｡. pt.. ; Foraminifera,. Coal-Fields. 5.. no.. (inJap.). 19). T･,. SHIKAMA, the. Univ.,. Soc.. On. Kuzuti. TAIくAI,. F･,. vol･ TANAI,. T.. Kyushu. kiharai, Kyushu;. Fossil. a. T.. Palaeogene. &. gen.. Soc･. Land. sp･. Rep.. Sci.. ;. Hokkaido;. of. Nat.. Fauna. Jap･, vol.. of. 45,. Turtle. Geomyda. Fossil. Flora. New. a. nov･,. Yok.. Mammalian. ONOE,. 1956:. (prelimina,ry Report). TEMMINCI(,. PalaeontologicalStudies. and. Prefecture. Totigi. of. T6hoku. Trams.. Proc.. Pal.. Univ.,. dredged. 2,. see.. Oligo-. the 2.. no.. Empire. Japanese. the 541.. no.. Terrapin-from. (A. Prelimi-. (in 丁ap.). from. Harbour;. Sasebo. Ibid.,. (in Jap,).. 538.. &. from. Sci. Rep.. Jolユr･ Geol･. ;. no･. Turtle. Land. Cenozoic. On. 45,. Geological. Kuzuu,. 9.. no.. 1938:. 1938:. -,. New. North. Note). nary. in. γol. 23.. s.,. of. Ossuaries.. Deposits. Senryuemys. Miocene. 22). The. :. a. 丁ap., n.. 1953:. -,. 21). 2,. ser.. 1953:. -,. 20). 1949. Limestone-Fissure. C･ J. &. ;. Bull･. tI･ ScliLEGEL,. from. Geol･. 1837:. the. Surv･. Reptilia. Sasebo. Jap･, vol･. Coal. Field. 7,. 2･. elaborantibus.. not. In. in. Northern. (in Jap･)･. SIEBOLD's. Fauna. Japonica.. 23). TINZEl,. Grad･. 24). TsuDA, Niigata. 25). WILLIAMS,. K･,. 1953. Thesis, K･,. 1953: Univ･, E.,. Geology. :. Yob.. of. Nat.. Geology ser･. 1953:. 2,. A. the. Univ. of. γol. 1, New. Neighbourhood. of. Huk-ユOka-mati,. Iwate. Prefecture. ;. (in 丁ap.). Yatsuo no.. Area 2.. Fossil. in. Toyama. Prefecture･,. Jour.. Fac.. Sci.. (in 丁ap.). Tortoise. from. the. Thomas. Farm. Miocene. of.

(28) 62. Florida;. Bull.. 1954:. -,. Tertiary. 1954:. WIMAN,. 27). YAMASAEI,. Fossil. Soc.. -,. R., 1 1953:. &. Fossil. 59,. no.. The. Fieldiana,. lbid.,. Distribution. pts.. 3. Turtles. Emydine. of. Chelyid. of. 1bid･,. Continents; aus. China;. the. Karatu. Schildkr6ten 696.. ll.. no.. Lineage. Valid. from. Eu-. the. 28.. Stratigraphy. 1948:. 2;. the. ■107,. vol.. A no,. Northern. 1953:. Jap., vol.. ZANGERL, Pts.. boda.. and on. C., 1930: T.,. Zool.,. Comp.. ; Breviora,. Turtles. Chelyid. 26). Mus.. Clemmydopsis. ropean -,. 28). Shikama. T.. of. Turtles.. 2.. Reputed. Additional. 32･. no.. Sin.,. Pal. Coal. ser.. Field,. c,. vol.. Kyushu･,. 6, fasc･. Jour･. 3･. Geol･. (in 丁ap.).. Vertebrate. vol. 3, mos. & 4; Ibid.,. Fauna 1 vol.. Selma. the. of 2.. & 3,. nos.. 3. &. 4.. Formation｢. of. Alabama･.

(29) Explanation. Geoclemmys 1.. Carapace. Fig.. 2.. Ditto. Fig.. 3.. Right. Fig.. of. mlaiuuraens3's side. Plate. sp.. of holotype.xO.9. of paratype.xI lateral. side. of paratype.×1.. nov.. 3.

(30) Sec.. Ikeuchi. photo.. Plate ⅠⅠ.. III.

(31) Explanation Geoclemmys Fig.. 1.. Plastral. Fig.. 2.. Right. Fig.. 3.. Plastral. of. maiuuraenst's side. lateral side. Plate. sp.. of bolotype.×0.9. side. of holotype.×1.. of paratype.×1.. nov.. 4.

(32) Sec. ⅠⅠ. Plate IV. Ikeuchi. photo..

(33) Explanation Geoclemmys F!g.. 1.. Carapace. Fig.. 2.. Left. yudaensis side. of holotype.. 1?feral side. of sp.. Plate. nov･. ×0.6. of holotype.. xO.7.. 5.

(34) Sec.. Ikeuchi. photo.. ⅠⅠ,Plate. V.

(35) Explanation Geoclemmys Fig.. 1.. Plastral. Fig.. 2.. Right. yudaensis side lateral. of bolotype. side. Plate. of sp.. nov.. ×0.5.. of holotype.. xO.7.. 6.

(36) Sec.. Ikeuchi. photo.. ⅠⅠ.Plate. VI.

(37) ExplaTLatiorL Kwobechelys Fig.. 1.. Carapace. Fig.. 2.. Anterior. iricarinala side side. of holotype.. Of gen. ×0.7.. of bolotype.×0.8.. Plate &. sp.. 7. nov..

(38) Sec.. Ikeucbi. photo.. ⅠⅠ.Plate. VII.

(39) Explatlation Kuro･bechelys Fig.. 1.. Plastral. Fig.. 2.. Right. Fig.. 3.. Le比1ateral. side lateral. iricwinaia. of. Plate. gen.. &. of壬101otype.×0.7. side side. of bolotype.×0且 of bolotype.×0.7.. sp.. 8. nov･.

(40) Sec.. ⅠⅠ.Plate. VIII. 0 -iJ. O. ,< D1. 3 O. ゴ 4). 月. =.

(41)