Trans. Proc. Palaeont. Soc. Japan. N.S., No. 56, pp, 322-331, pl. 48. Dec. 20, 1964

480. YABEICERA S ( AMMONITES) FROM FUTABA, NORTHEAST JAPAN*

TATSUR0 MATSUMOTO

Department of Geology. Kyushu University

IKUWO OBATA

Department of Palaeontology. National Science Museum

and

SHIRO MAEDA and TERUO SATO

Geological Institute, Chiba University

東 北 日本 双 葉 産 ヤ ベ イセ ラス(白ll巨紀 ア ソモナ イ の:上 部 臼亜 系 浦河 統 ド郷階 に属 す る 双 奨 層 ド部の礫 岩 層 か ら 産 したYabeiceras orientale ToKUNAGA and SHIMIZUの 完 模式 標 本は,東 京 空 襲 の時 に 残念 な が ら焼 失 した とみな され る。 そ こ で原 産 地 か ら さ らに 標 本 を 得 よ うと努 力 して きた 。数 年 前 に 小畠 は小 型の 幼 殻 を 得 て い た 。 最近 前 田 の 引 率 し た巡 検旅 行 中 に.佐 藤 が 幸 に も成1ド殻の 化 石 を 採 集 した。 これ ら に っ い て くわ しい 古 生 物学 的 記 載 を行 な い, Yabeicerasの 類 縁 関 係 に')い て 論 述 す る 。 捕 属 の幼`騰 ～はForrosteriaに 似 た点 が あ る 。 ま たEborceras BASSE.1946はYabeiceras TOKUNAG and SHIMIZU.1926の シ ノニ ムで あ る,F.もE.も 従 来Barroisiceralinaeに 入れ られ て い る,記 載 した 標 本 は九 州 大 学 に 保 管 す る。 1965年 に 矢 部長 克 光生 は 数 え の88歳 に な られ ます 。 謹 ん で お 複 い し.こ の 小 著 を先 生 に 献 げ ます 。 松 本 達 斑 ・小 畠 郁 生 ・前 田 四 郎 ・佐 藤 輝 夫

Introduction occasion. The original type specimens described TOKUNAGA and SHIMIZU (1926) des- by TOKUNAGA and SHIMIZU (1926), most cribed a number of Cretaceous fossils of which must have been preserved at from the Futaba Formation in the Joban the Waseda University, Tokyo, together coalfield, about 200 km to the north- with other fossils from the Joban area. northeast of Tokyo. This was an admir- are judged to have been burnt up by a able contribution to our knowledge in fire of World War 11, 1944, except for a that the Upper Cretaceous deposits were few specimens which have been for some recognized on the evidence of fossils reason deposited at the Tohoku Uni- underneath the coal-bearing Tertiary of versity, Sendai. This judgement is based the Joban area and that some of the on the replies given to the writers from described species were entirely new to the Faculty Members of Waseda Uni- science. Yabeiceras, an interesting am- versity, Tohoku University and the Uni- monite genus, was established on that versity of Tokyo and also Dr. H. YABE. Received August 20. 1964 ; read Sept. The holotype, by monotypy, of Yabei- 20. 1964. ceras orientale TOKUNAGA and SHIMIZU

322 480. Yabeiceras (Cretaceous Ammonites) 323

(1926, p. 201, pl. 22, fig. 7 ; pl. 27, fig. la- CHIDA and Dr. Masafumi MURATA for c), the type-species of Yabeiceras TOKU- giving them information about where- NAGA and SHIMIZU, 1926 (originally de- abouts of TOKUNAGA and SHIMIZU'S signated in p. 199), and the type-speci- types, and to Mr. C. W. WRIGHT in mens of other two species, Y. kotoi and London for his critical reading of the Y. himuroi, of the same genus were typescript. Dr. ltaru HAYAMI took pho- probably destroyed. This regrettable tographs at Kyushu University and Miss situation has given to palaeontologists Tomoko Mn AZAKI assisted in preparing some difficulty in the appropriate deter- the manuscript. mination of the systematic position of the genus as well as in the correct identification of the species. Description The two senior authors (T. M. and Yabeiceras orientate TOKUNAGA 1.0.), therefore, have endeavoured to get specimens of Yabeiceras from the type- and SHIMIZU locality, upper reaches of Sakurazawa PI. 48. Figs. la-c. 2a-e ; in Oriki, where Lower Member of the Text-figs. la-d, 2a-e, 3. Futaba Formation is exposed. Although bivalves occur there in abundance. am- 1926. Yabeiceras orientate TOKUNAGAand monites are quite rare. Only a small. Shimizu, Jour. Fac. Sci., Imp. Univ. To- kyo. Sect. II, Vol. 1. Pt. 6, p. 201, p1. probably immature specimen of Yabei- 22. fig. 7; pl. 27, fig. la-c. ceras orientale and a few heteromorpha 1926. Yabeiceras orientate. SHIMIZU, Proc. have been collected there. Imp. Acad.. Japan. Vol. 2, No. 10. p. In summer 1963, the third author (S. M.) 547. conducted a departmental excursion to Types-The holotype is the specimen the Futaba area. After six days field described and figured by TOKUNAGA and work by a group of thirteen students. SHIMIZU (1926, indicated above), which an adult ammonite which was unfamiliar was almost certainly destroyed in 1944. to them was finally acquired at the same A neotype has to be officially proposed locality by the last author (T. S.). a and its validity should be acknowledged. student. The specimen was brought to Material:—The two specimens to be the Department of Palaeontology, Natio- described in this paper are GK. H5556, nal Science Museum. Tokyo and shown an internal mould of an adult shell to the second author (1. O.), who told (Coll. S. MAEDA and T. SATO), and GK. him its significance. It was developed H5557, that of an immature shell (Coll. from the rock matrix and cleaned in a I. OBATA).They are preserved in the laboratory of Chiba University and then Type-Specimen Room, Departmet of donated to Kyushu University for fur- Geology, Kyushu University, Fukuoka. ther palaeontological study. The rock matrix is made up of calcare- This paper contains the description ous sandstone. Therefore the fossils are and illustration of the two specimens. secondarily little deformed. On some Before going further the writers wish part an inner layer of the test is pre- to acknowledge the debt of gratitude to served. The innermost nuclear part and Prefessor Emeritus Hisakatsu YABE, a half of the body-whorl of the first Professors Kotora HATAI, Sadajiro TSU- specimen are not preserved. The un- 324 Tatsztro MATSUMOTO et al. illustrated side of the shell is dissolved Glvcymeris and other bivalves are ac- and hardly separable from the rock cumulated. matrix in which shells of Apiotrigonia,

Measurements (in millimeters):-

Specimen [Part] Diameter Umbilicus Height Breadth .) (C.)B./H. (Interc (I.)(Costal) GK. H5556 123.0(1) 59.4(0.48) 39.6 15.8x2 0.8 [3/2 vol. early] 52.0(1) 23.0(0.44) 17. 3(0.33) 27. 5(0.53) 23. 5(0.49) 1.58 1.47 [2 vol...] -- 15.5 20.0 15.51.29 1.0 [3 vol.,.]c. 40.0(1) 16.0(0.4) 12.5(0.31) 16.2(0.40) 13.2(0.33) 1.29 1.05 GK. 115557 29.6(1) 9.5(0.32) 12.0(0.40) 14.5(0.48) 12.3(0.41) 1.20 1.02 vol...]-- [L 10.612.3 10.81.16 1.01 [4 vol.,.] 20.4(1) 6.4(0.31) 8.8(0.43) 10.8(0.53) 9.4(0.46) 1.22 1.06 Holotype(T. & SH.) 62 26(0.41) 22(0.35) 26 (0.42)1.18

Description :-The characters of the ribs extending radially from the tubercle shell of this species change to a large to near the umbilical margin without extent with growth, as has been already umbilical tubercles. secondary ribs bifur- mentioned by TOKUNAGA and SHIMlZU cating from the mediolateral tubercles (1926) and SHIMIZU (1926). The change with a moderate projection on the venter, may be shown more clearly, at least in and weak tubercles at the ventrolateral some respects, by the present two speci- shoulder on the secondary ribs. A low mens than by the holotype. There may siphonal keel is weakly undulated ; each be also a certain extent of variation undulation corresponds in number and within a species. Even if the shells of position with one of the secondary ribs the same diameter are brought into which form obtuse chevrons on the comparison, they may be somewhat dis- venter. The lateral tubercles on the similar. anterior part of the preserved last whorl The smaller specimen, GK. 1-15557 (P1. of this specimen are rather mammillate 48, Fig. la-c ; Text.fig. la-d), probably and on the rest part they are bullate, represents a young shell. It is about although this is the character observed 30 mm. in diameter and is wholly septate. on the internal mould. It has an umbilicus of moderate size On the next inner whorl of the same (about 31 percent of the diameter). It specimen distant, weak radial ribs, which is moderately involute, about a half of are broadened and elevated at the medio- the inner whorl being overlapped by the lateral tubercles are observable. The outer. The whorl of this stage is nearly tubercles look subangular and in contact as high as broad and subcircular in the with the steep umbilical wall of the intercostal section, but it is somewhat outer whorl. A siphonal keel, lateral broader than high and rather polygonal tubercles and ribs seem to appear at in costal section. The ornament in this about the shell diameter of 9 mm. The stage consists of fairly strong tubercles flanks are somewhat flattened and the at about the middle of the flank (i. e. venter is low, roof-shaped in this stage, slightly below the mid-height), about although the details of the venter are eight in a half volution, simple, blunt not clearly seen. The characters of still 480. Yabeicera.s (Cretaceous Ammonites) 325

a b c

E

d

Fig. 1a-d. Yabeiceras orientate TOKUNAGA and SHIMIZU. A diagrammatic sketch (partly restored) of a young shell. GK. H5557. Lateral (a). ventral (b) and sectional (c) views; External suture (d) at the stage marked as s in Fig. Ia. T. M. delin. inner whorl are not well shown. est whorl, with height of 12.5 mm. and The suture at whorl-height of 10 mm. intercostal breadth of 13.2 mm., approxi- on the outer whorl is illustrated (Text- mately represents the stage which fig. 1d). The heads of the saddles are follows that of the smaller specimen arranged on a descending line. The described above. It has a similarly sub- saddle between E and L is high and circular intercostal section and the same asymmetrically divided ; the outer larger type of ornamentation as that of the branch is further subdivided. L is deep smaller specimen. The lateral, rounded and has fairly deep and narrow, four, tubercles become increasingly stronger. asymmetrically disposed branches. E is There are fourteen tubercles in the nearly as deep as or somewhat larger whorl of about •10mm. in diameter. than L in this stage. Other auxiliary Faint secondary ribs spring in pairs elements (U2. adjacent saddles, subdivided from the lateral tubercles and they are U„) are smaller. All the elements are provided with faint outer ventrolateral moderately incised, inspite of the small, or rather to say ventral tubercles on a immature state of the shell. line fairly close to the mid-venter. The siphonal keel is low and faintly undu- The other, larger, specimen, GK. 1-15556 lated. (Pl. 48 Fig. 2a-e ; Text-figs. 2a-e, 3) The succeeding whorl is unusually shows slowly growing three outer whorls. depressed and rather coronate in cross- Its inner nuclear part as large as the section, with a much larger proportion preceding specimen is not well preserved of breadth to height (see Measurements). for some reason. The observable young- It has a steep umbilical wall and a 326 Tatsuro MATSUMOTO et al.

C

d

a

b

e

Fig. 2a-e. Yabeiceras orienlale TOKUNAGA and SHIMIZU. A sketch of an adult shell, GK. H5556. Lateral (a) and sectional (b) views; a ventral view of the inner whorl is shown in Fig. 2b. Ventral view (partly restored) (c), cross-section (d) and suture (e) of a part of the last second whorl, which is removed and only in- dicated by broken lines in Fig. 2a. The illustrated suture is at the stage marked as s in fig. 2a. T. M. delin. rounded umbilical shoulder. It embraces ribs which spring outward and forward about one third of the inner whorl. The from the lateral tubercles are also blunt, lateral tubercles are strong, rounded at fading away on the venter, without the base and mammillate. The radial showing clearly the paired state. There rib which extends from the lateral remain, however, scarcely perceptible tubercle to the umbilical margin is blunt elevations on the lines parallel to and in this stage. The secondary, projected not far from the siphonal keel. They 480. Yabeiceras (Cretaceous Ammonites) 327

look as if they formed very faint side L and U, is moderately broad, being keels. The siphonal keel itself is also situated on the row of lateral tubercles. weakened and smoothed, although it is It is as a rule divided but the outline more distinct than the side keels. in detail may be modified, probably due The last suture is exposed on the late to the relation with the large tubercle. part of the tuberculate whorl, i. e. the The saddle between U. and U3 is rather last second whorl (see Pl . 48. Fig. 2a ; unusually deeply divided. Text-figs. 2a, 3). Beyond the last suture The living chamber occupies more than the flank of the whorl is less inflated a full volution in this specimen. A and the lateral tubercles are rapidly posterior half of the last whorl is un- weakened. fortunately missing. Presumably it had The suture in the stage of the strongly been destroyed and gone before the- tuberculate, depressed whorl is illustrated deposition, as is suggested by the dis- in Text-fig. 2e. It consists of the ele- position of associated bivalved shells. As. ments of E, L, U2_.U3 (=S), U, . I. They far as the observable part is concerned, are in general moderately deeply incised . the last whorl is quite dissimilar to the E is broad and nearly as deep as L. L septate one. It grows slowly and over- is longer than broad and has narrow and laps about one third of the inner whorl. deep, apparently trifid branches, but its The umbilicus is wide, occupying well stern is not much narrowed. U. is over 40 percent of the entire shell dia- moderately broad and its minor incisions meter. The umbilical wall is steep and are not very deep. The internal elements somewhat excavated ; the umbilical. (I and U1) are narrow. The summits of shoulder is subrounded to subangular. the saddles are arranged on a line The whorl is considerably higher than descending to the umbilical seam. The broad, with a proportion of 8: 10 between saddle between E and L is considerably breadth and height. It is broadest be- deeply incised and its stem is narrowed. tween the umbilical shoulders ; the flanks. Its head is asymmetrically bifld , with a are convergent and only gently convex; narrower and somewhat oblique branch the venter is flat or slightly arched, with on the side of L. The saddle between extremely obscured side keels at the ventrolateral shoulders and a faint rem nant of the mid-ventral keel. The whorl- section is, thus, roughly trapezoid. The surface is smooth ; tubercles and ribs, _ with which the inner whorls are charac- teristically ornamented, completely dis- appear from the last whorl. The character of the whorl changes. Fig. 3. Yabeiceras orientate To- little within the last half volution. The KUNAGA and Shimizu. Exposed part diameter of the shell at the last end of of the last suture on the last second the observable part is 123 mm. The whorl of GK. 115556 (see a sketch in apertural margin is not preserved in the Fig. 2). Broken line indicates the um- present specimen. bilical margin of the outer whorl; the Occurrence :—The two specimens were dotted line the mediolateral tubercle. found in nodular calcareous sandstone T. M. delin. embedded in the Lower Conglomerate 3 28 Tatsuro MATSUMOTO et at.

Member of the Futaba Formation, in the well be regarded as being within the upper reaches of the Sakura-zawa, Oriki, extent of variation. irono-mura, Futaba-gun, FukushimaH This species exhibits a peculiar type Prefecture. Many bivalves of shallow of change with growth in the shape of sea environments such as Glycymeris, the whorl. In the relatively early growth- piolrigonia, etc. are associatedA with the stage the whorl is nearly as high as ammonites. Inoceramues uwajinrensis broad ; the flanks are rather flat when YEHARA,an index of the Lower Uraka- the shell is 5 to 15 mm. in diameter. and wan (), occurs abundantly in then become rounded tin costal section). the same member. In the middle growth-stage, with dia- meters over 30 mm. up to 60 mm. or so, the whorl is broader than high and the Remarks flanks are inflated. The most depressed Comments are given here mainly on whorl in the specimen GE. 115556, at a two points.—(1) Are the two described diameter of 52 mm., has the proportion specimens from Futaba really of identi- of 1.47 between breadth (intercostal) and cal species with the holotype of Yabel- height. This seems to be somewhat ceras orientate? (2) What do the ob- larger as compared with 1.18 at a dia- served facts suggest about the affinities meter of 62 mm. in the holotype. The of Yabeiceras? exact comparison is, however, difficult, Although the holotype of Y. orientate without seeing the actual specimen, since is at present inaccessible to the writers. the change of dimensions with growth its characters are understandable to a was not indicated by figures in the ori- considerable extent from the description ginal description. The last whorl is and illustration of TOKUNAGAand SHI- higher than broad and has smooth, MIZU (1926, p. 201, pl. 22, fig. 7 ; pl. 27. flattened flanks. In this point the fig. la-c). In the essential points the writers' specimen agree with the holo- two specimens under consideration well type, although the ventral part of the agree with the holotype. last whorl of the latter is much damaged. The smaller specimen, GE. H5557. is In the diagnostic change of ornament- apparently more narrowly umbilicate ation the two specimens described above than the larger one. This is probably essentially agree with the holotype. The ascribed, at least partly, to the difference ribs which extend from the lateral tuber- between immature and grown whorls, cles to the umbilical margin look more because the width of umbilicus in pro- blunt in GK. 1-15556 than in the holotype. portion to the shell diameter gradually The lateral tubercles in the present two increases, as shown by the figures in the specimens seem to be situated on a line measurements. There can be also slight somewhat lower than that in the holo- difference between individuals. The di- type. The differences are again rather mensions of the holotype, as measured slight and these characters change with by TOKUNAGAand SHIMIZU,indicate a growth even in one and the same indi- somewhat smaller proportion of umbili- vidual. TOKUNAGA and SHIMIZU did not cus to diameter than the present larger describe the faint elevations, i. e. the specimen. GK. H5556. The difference is. reduced outer ventrolateral tubercles, however, by no means great and can which should be discernible on the 480. Yabeiceras (Cretaceous Ammonites) 329 secondary, ventral ribs on the inner As has been described above, Yabei- whorls. This character is, however. ceras orientate shows so particular type shown on the photographs (TOKUNAGA of changes with growth that it may be and SHMHZU, 1926, pl. 27. fig. 1 and also a puzzle to tell its true systematic posi- pl. 16, fig. 15 [ Y. kotoi]). tion. The suture changes with growth and In the evolute, widely umbilicate, and ,can be modified in correlation with the tricarinate (although very indistinctly so) minor details of a whorl-shape and also shell, Yabeiceras could be taxonomically strength and relative position of a tuber- included in the subfamily Perniceratinae. cle. In the illustrated suture of the In fact the suture of Yabeiceras consider- present larger specimen the saddle be- ably resembles that of Peroniceras DE tween L and U, is broader than that of GROSSOUVRE, 1894. The carinate and the holotype. In the smaller specimen arched venter of the septate whorls of it is as narrow as the latter, but the Yabeiceras is similar to that of Gau- saddle between E and L is comparatively thiericeras DE GROSSOUVRE, 1894, and broad. This and other minor differences Ciryella WIEDMANN, 1959. The medio- in the suture between the present speci- lateral tubercles are developed in the mens and the holotype are not significant middle growth-stage of Gauthiericeras enough to separate them into different margae, the type-species of Gauthieri- species. The general similarity is more ceras, if not so strongly as in the adoles- remarkable than the minor differences. cent stage of Yabeiceras orientate. But To sum up the specific identity of the such an entirely smooth last whorl as present two specimens with the holotype that of Y. orientate is not seen in any of Yabeiceras orientate is warrantable. well known examples of Peroniceratinae. granted that there is a certain entent Some species of Peroniceras attain a of variation between individuals. large size, as has been exemplified by As regards the affinities of Yabeiceras those described by DESIO (1936) and VAN orientate, Cenomanian Schloenbachia OEPEN (1955). The last whorl in thoseH NEUAIAYR, 1875, was at first considered species is distinctly costate and tricari- by TOKUNAGA and SHIMIZU (1926, p. 201). nate. SHIMIZU (1926, p. 548) on another occasion In Yabeiceras orientate the mode of mentioned a similarity of Yabeiceras in life must have been considerably differ- shell-form and ornamentation to " the ent between the of the strongly group of Barroisiceras desmolinsi." He ornate and inflated whorls of the middle (1931. p. 78) ascribed Yabeiceras to the ages and that of the smooth and com- family Priontropidae as understood at pressed one of the adult to senile- ages, that date. For about two decades no although the writers have not got enough comments had been given to the system- evidence in the mode of occurrence of atic position of the genus. until WRIGHT the fossils. (1957, p. L 129) placed it in the subfamily In view of the moderate involution, Peroniceratinae of the family Collignoni- polygonal costal section, and a particular ceratidae. MATSUMOTO's opinion (per- type of ornamentation, the inner whorls sonal communication in 1954) that Yabei- of Yabeiceras resemble those of For- ceras seemed to be somewhat similar to resteria REESIDE, 1931, of the subfamily Gauthiericeras was taken into consider- Barroisiceratinae. In Forresleria not ation by WRIGHT. only the mediolateral but also the ventro- 330 Tatsttro MATSUMOTO et at. lateral and ventral tubercles are strong, ceras orientate (Text-fig. Id in this. forming angular shoulders, while in paper), although the former has broader Yabeiceras mediolateral tubercles are saddles than the latter. In general the very strong but the ventrolateral and suture of Yabeiceras in the late growth- ventral tubercles are weak and finally stage is more deeply and finely incised lost as the shell grows and it has no and has a narrower first lateral saddle angular ventrolateral shoulders. On the than that of . outer, adult whorl of Forresteria the It should be noted that Eboroceras mediolateral tubercles normally fuse with inagnumbilicatunt BASSE (1946, p. 73, pl. the exaggerated ventrolateral ones (in 2, fig. 2a, b), from the Coniacian of subgenus Forresteria s. s.), or to the um- Madagascar, closely resembles Yabeiceras bilical ones (in subgenus Reesideoceras), orientate. The former has weak umbili- or disappear (in subgenus Harleites). cal tubercles in addition to the strong Harleites is however, much compressed mediolateral tubercles. This difference is and involute, and has angular ventro- specific, for Yabeiceras kotoi TOKUNAGA lateral shoulders on which fine clavae and SHIMIZU also has small umbilical remain. Thus, Yabeiceras is related to tubercles on the inner whorl. Eboroceras but is distinguishable from any sub- BASSE, 1946, is certainly a synonym of genera of Forresteria. Yabeiceras TOKUNAGA and SHIMIZU, 1926. As far as the described species are Further discussions and the final con- concerned, Yabeiceras most closely re- clusion about the systematic position of sembles the subgroup of Forresteria Yabeiceras are to be reserved until more ampozaloakaense BASSI.: (1947, p. 131 pl. examples of Yabeiceras and related 9, fig. 9), in which the ornaments gradu- genera from Hokkaido are described by ally fade away on the outer whorl. one of the writers (T. M.). BASSE'S species is evidently more in- volute than Y. orientate. It probably needs a new subgeneric name. References Cited The suture of the Barroisiceratinae is BASSE, Eliane (1946) : Sur deux ammonites fairly variable, as has been demonstrated nouvelles du Coniacien du sud-ouest de by BASSE (1947) and others. One of the Madagadcar : Subbarroisiceras n. g. maha- illustrated sutures of Forresteria for- falense n. sp. et Eboroceras n. g. magnum- resteri REESIDE (1931, p. 17, pl. 5, fig. 7) bilicatum n. sp. Bull. Soc. Geol. France, considerably resembles that of Yabei- 5 ser.. vol. 16, p. 71-76. p1. 2.

Explanation of Plate 48

Figs. la-c, 2a-e. Yabeiceras orientate TOKUNAGA and SHIMIZU. 1. A young shell, GK. H5557, from the upper reaches of the Sakurazawa. Oriki, Hirono- mura. Futaba-gun. Fukushima Prefecture. Lower member of the Futaba Formation. Two lateral (a, b) and ventral (c) views, x3/2. 2. An adult shell. GK. H5556, from the same locality and member. Lateral (a) and ventral (b) views of the main part. Natural cross-sections and ventral views of inner whorls (c). Lateral (d) and ventral (e) views of a part of the last second whorl, which is re- moved in Fig. 2a ; a-e all in natural size. (Photos by I. HAYAMI, without whitening) MATSUMOTO et al.: Yabeiceras Plate 48

1a 1c

1b

2d

2c

2e 2b

2a 480. Yabeiceras (Cretaceous Ammonites) 331

-(1947) : Paleonl.ologie de Madagascar -(1934) : . In SHIMIZU, Sa- N. xxvi-Les peuplements Malgaches de buro and OHATA. Tadahiro (1934): Barroisiceras. Revision du genre Bar- Cephalopoda. Iwanami's Ser. Geol. & Pa- roisiceras of GROSS. Ann. Paldont.. vol. laeont., 137 p., Tokyo (in Japanese). 33, p. 100-190, pls. 7-15 [1-9]. TOKNAGA, Shigeyasu and SHIMIZU. Saburo Drsro, A. (1920) : La creta nel bacino di (1926) : The Cretaceous formation of Firenze. Paleontogr. Italica. vol. 26, p. Futaba in Iwaki and its fossils. Jour. 187-243, pl. 12-19 [1-8]. Fac. Sci., Imp. Univ. Tokyo, sect. 2, vol. GRossouvRn, Albert DE (1894) : Recherches 1, pt. 6. p. 181-212, pls. 21-27. sur la Craie superieure. II Paleontologie. IEDMANN, Jost (1959) : LeW Cretace super- Les ammonites de la Craie superieure. ieur de I'Espagne et du Portugal et ces Mem. Carte giol. dit. France [1893]. 264 cephalopodes. 84e Congris des Soc. Sav- p., 39 pls. antes, 1959. p. 709-764. includ. pls. 1-8. HOEPEN, E. C. N. VAN (1955) : Turonian-Con WRIGHT. C. W. (1957) In MOORE. R. C. [Edi- iacian ammonites from Zululand. South tor] (1957): Treatise on Invertebrate African Jour. Sci., vol. 51, no. 12, p. Paleontology. Part L, , Cephalo- 361-377. includ. figs. 7-31. podea. Ammonoidea. p. L1-L490, Geol. NEUMAYR, M. (1875) : Die Ammoniten der Soc. Amer. & Univ. Kansas Press. Kreide and die Systematik der Ammoni- tiden. Zeitsclar. Deutsch. Geol. Gesell., vol. 27, p. 854-892. Locality Guide REESIDE, J. B. Jr. (1931) : The Upper Creta-

ceous ammonite genus Barroisiceras in Upper reaches of the Sakurazawa, Oriki,

the United States. 11. S. Geol. Surv., Prof irono-mura, Futaba-gun, FukushimaH

Paper. 170-B, p. 9-29. pls. 3-10. Prefecture

SHIMIZU, Saburo (1926) : Three interesting (Approximately 140•‹57'15" East Long.. 37•‹12' Cretaceous ammonites recently acquired 10" North Lat.) from Ilokkaido and Saghalien. Proc. 綴島 県 双 葉 郡 広野 村 折 木 桜 沢 上 流(岡土 地 理 院 5 Imp. Acad. (Japan), vol. 2, no. 10. p. 547- 万 分 の1地 形 図 幅 「川前」 の 南 東隅 か ら北 550. 4050m西4250mの 地 点)