CEPHALOPODA FROM THE HOKKAIDO. 17 



All these distinguishing characters, however, vary much 

 among the specimens. One of these specimens approaching the 

 typical species in the surfoce marking possesses, at the same 

 time, whorls not so widely open as in the others, thus undoulttedly 

 forming a connective link between the typical species and the 

 above mentioned type of the variety. A specimen representing 

 the opposite extremity of variation shows a suture line which 

 does not essentially differ from that of the typical species (fig. 8). 

 There is another specimen from the Shisanushibe which the Avriter 

 with some hesitation refers to the same variety. 



Localities: — The four specimens above mentioned are from 

 (1) the Opiraushibets where it was found as a pebble close to 

 the confluence of the Panke-kenebets (fig. o), (2) the Opiraushibets 

 in its middle course, (3) the Shisanushibe, a tri1)utary of the 

 Popet, and (4) the Yilbarigawa (fig. {)). The specimen from the 

 last locality was found in the collection of Jimp.ö. 



Horizon : — All the specimens being obtaii:ed from among the 

 river gravels, the exact geological horizon in ^vhich they occur is 

 of course unknown. But the one from the middle course of the 

 Opiraushibets was found associated with Scaphiles puerculus Jimbö 

 in a marly nodule ; hence, there is a great probability, that it was 

 derived from the extensive Seaphiies-he(\^ in the neighborhood of 

 the above river. 



HETEROCERAS (?) JAPONICUM m. 

 PL III., fig. 8. 



1902. Turrililes cfr. Indicus Yabe : List of Ammonites from 

 the Cretaceous of the Hokkaido, in Outlines of the 



