CEPHALOPODA FROM THE HOKKAIDO. 19 



American specimen is described as showing three or four con- 

 strictions, besides the numerous ribs of the ordinary kind. 



Besides the specimen on which the above descrij^tion is based, 

 there is another from the Opiraushibets which is much more 

 fragmentary, and which therefore the writer refers with much 

 hesitation to the same species. 



Localities : — The Yubarigawa, Isliikari Prov. (figured), and 

 the Opiraushibets, Teshio Prov. 



Horizon : — Upper Ammonite-beds. 



Localities and horizons of the allied species : — 



H. indlcum Stol. The uppermost lied of the Trichinopolv 

 group of South India. 



H. indicum Stol. (?). The lower Cliico group of Smith 

 ranch near Phœnix, Oregon. 



HETEROCERAS (?) ORIENTALE m. 

 PL IIL, fig. 7. 



There are two internal casts of a shell which the writer takes 

 for a new species. The larger and better of these two specimens, 

 has only one and a half volutions preserved. The diagnosis runs 

 as follow^s : — 



Shell sinistral, very much elongated longitudinally. Vo- 

 lutions slender, increasing in size gradually toward the anterior 

 portion, making very oblique and open coils. Whorls oblong in 

 cross-section with the longer axis oblique to the axis of volution. 

 Surface marked with very flexuous, transverse ribs except on the 

 smooth inner side. Kibs slightly irregular in size, usually simple 



