4 ART. 2. H. YABE : CRETACEOUS 



age. European authorities, such as A. de Lapparent/^ Ernst 

 Koken'-^ and Franz Kossmat^' believed the existence of different 

 horizons in our Cretaceous upon the palaeontological data, corres- 

 ponding in age to the different subdivisions of the European upper 

 Cretaceous. On the other hand, J.. Böhm^' and R. Michael^^ 

 noticed tlie occurrence of fossils characteristic of the Senoniau, 

 while Rudolf Zueer*"'^ expressed the opinion that the Cretaceous 

 of the Hokkaido and Saghalien contain lower Cretaceous type of 

 Ammonites. 



1) a. de Lapparent : Traité de Géologie. Quatrième édition. III. Iö99. Pp. lo46, 

 1361 and 1394. 



2) Ernst Koken: Die Vorwelt und ilire Entwickelungsgescliichte. 1893. P. 421. 



3) Fkanz Kossmat : Ueber die EeLleutung der sü lindisclien Kreideforniation für die 

 Beurtheilung der geograpliischen Verbältnisse wübrend der späteren Kreidezeit, Jalirb. k. 

 k. geol. Reichsanstalt, Wien. Bd. XLIV. 1894. Heft. 3, p. 470. 



KossMAT also criticized the Ammonites of the Hokkaido in liis " Untersuchungen über 

 die südindische Kreideformation." He considers Pliyllnceras ezo'ênse YoK. as a form very 

 closely allied to P. Forbesianum d'Orb., while he considers Uesmoceras Damesi Jimbö as 

 probably identical with I), .vigntd Forbes. He brings Lylncerw^ slriatum Jimbö, L. crassicoslcUum 

 JlMBo and demepUcaturn Jijibû under Gaudryceras and L. glabrvni Jjmbô under Telragonites. 

 One of the many Hamite'i described as H. sp. by Jimbö is regarded by him as identical with 

 //. {Anisoca'us) largemlcatua Forbes, and Acanthoceras rotomagense Defr. var asialica JlMBo 

 as identical with A. Neivholdi Kossmat. Anisuccra>i cfr. rugatus of Yokoyama, according to 

 KoriSMAT, is distinguished by its finer, obliquely arranged ribs from that of Forbes. 

 Pachydisctis Dunisoiiianus vStol. has been divided into the three species of Hulcodiscus 

 >--payicostatus, P. Jimboi and P. Denisonlanus, by Kossmat and all of them are quite different 

 from what Jimbö described as such. He also doubts whether Desmocenxs hhlkawal Jimbö is 

 not a Ilolcodiscua and takes D. gaudama of Yokoyama for a coarsely ribbed variety of D. 

 indopacifica Kossmat. 



•J. F. Whiteaves of the Geological Survey of Canada, pointed out the occurence of 

 Pachydiscus Ilaradai Jimbö and Hainites ohdrkiua Jimbö in the Cretaceous of Vancouver 

 Island. (J. F. Whiteaves : On some Fossils from the Nanaimo group of Vancouver 

 Cretaceous. Trans. Royal Soc. Canada. Stction IV. 1895. Pp. 130 and 132). In one of liis 

 letters to Jimbö in 1895, he expressed the opinion that Pesmoceras Ishikawai might possibly . 

 be identical with Haploceras (afterward considered as an Holcodiscus) cumsheiuaense Whiteaves 

 ffom the Queen Charlotte Islands. 



4) JoH. Böhm: üeber Ammolntes pcdenvjlis v. Buch. Zeitsclirift d. deutsch, geol. 

 Gesellschaft. Bd. L. Heft. 1. 1895. P. 200. 



5) R. Michael: Ueber Kreidefossilien von der Insel Sachalin. Jahrb. d. k. preuss. 

 geol. Landesanstalt für 1898. 1899. P. 1Ü4. 



6) Rudolf Zuber : Geologie der Erdöl-Ablagerungen in den galizisclien Karpathen. 

 I. Allgemeiner Theil. Heft 1. 1899. P. 48. 



