JOURNAL OF THE COLLEGE OF SCIENCE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XX., ARTICLE 2. 



Cretaceous Cephalopoda from the Hokkaido. 



PART II.i) 



Tum'lffes, Jlelirorevas, JfcferoceraSf JSipjfonifes, 



Olcosteph runts, Dtsiaocrras, Ilnitericpi'fts, 



and an atidetei'iinned (Jenas. 



By 



Hisakatsu Yabe, RigakusM. 

 University Hall, Imperial Univ. of Tokyo. 



IFith 6 plates 



TURRILITES Lam. 



D'Orbigny l)ronglit nearly all of the tiirreted forms of 

 Ammonites under one of tlie three genera, Turrilites, Helicoceras, 

 and Heteroccras, distinguishing at the same time two groups in 

 the first genus, namely Turrilites roiundati and T. angulati. 



1) Since the publication of the first part of this memoir, a number of valuable papers 

 relating to foreign Cretaceous Cephalopod fauna have appeared both in Europe and America. 

 First of all, mention must be made of the works of Dr. F. M. Anderson (Cretaceous De- 

 posits of the Pacific Coast, 1902) and of Dr. J. F. Whiikaves (On some Additional Fossils 

 from the Vancouver Cretaceous, 1903), to botli of whom we are indebted for mucli accurate 

 and important knowledge concerning the Cretaceous deposits of the region along the Pacific 

 coast of the United States and Canada. A comparison of the results of these papers with 

 those reached by Professors Yokoyama and Jimbo and the present writer, will at once 

 bring out some remarkable faunistic resemblances between the deposits of California and 



