JOURNAL OF THE COLLEGE OF SCIENCE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN, 



VOL. XVIII., ARTICLE 2. 



Cretaceous Cephalopoda from the Hokkaido. 



PART I. 

 LytoceraSf Gaiidryceras and Tetraf/onites. 



By 



Hisakatsu Yabe, RigahisM. 

 Geological Institute, Science College, Imperial University, Tokyo. 



With 7 plates. 



Introductory Remarks. 



In 1877, Benjamin Smith Lyman first announced the oc- 

 curence of Cretaceous Ammonites in the Hokkaido, and his collec- 

 tion was examined by Edmund Naumann who published a short 

 account of the fossils without any detailed description.^^ A more 

 detailed account appeared in the work of Prof. Matajirö 



1) E. Naumann : Ueber das Vorkomnien der Kreideformation auf der Insel Jezo. 

 Mitth. d. deutsch. Gesell, für Natur u. Völkerkunde Ostasiens, Ed. XXI. 18S0. p. 28. The 

 following names of Ammonites are mentioned in this work: — 



Lytoceras Sacya Forbes. StoUczhda sp. 



Phylloceras n. sp. afF indra P'orbes. Ainsoceras (eiiuimlcatuin Forbes. 



„ cfr. subalpinum d'ORBiüNY. „ sp. 



„ Velledœ MiCHELfX. Anisoceias n. sp. 



Amallheus swjcda Forbes. Flychoceras gaultinum Pictet. 



Hcipl'iceras n. sp. „ n. sp. 



„ planvlatum So-\VERBY. ,, n. sp. 



„ Gardeni Baili". 



In a preliminary note in the same volume, D. Erai'NS mentions an Ammonite from 

 Ui'akawa as identical with Siephanoceras coroiiatum Brtjg. 



