310 Canadian Record of Science. 



and at least one of the tubercles, in the earlier portion of 

 the shell, is prominent and acutely conical, thus giving 

 the impression that the whole of the tubercles upon the 

 ribs of both specimens may be the bases of spines. This 

 specimen has convinced the writer that Hamites Vancou- 

 verensis is a true Anisoceras, allied to A. armatum, 

 Sowerby, but devoid of lateral tubercles, also that the 

 fragment from Comox described and figured by Meek as 

 Hetcroceras Cooperi, is probably a small piece of the abruptly 

 bent part of Anisoceras Vancouver ensc. A similar frag- 

 ment, now in the writer's possession, was collected quite 

 recently by Mr. Harvey at Hornby Island. It is most 

 likely also that the fragments of the shell of a cephalopod 

 from the Chico Group of California, for which Gabb pro- 

 posed the name " ? Ammonites Cooperi" are distorted 

 pieces of A. Vancouver ensc, and if that be the case the 

 laws of priority may require that the species shall be 

 called Anisoceras Cooperi, Gabb. (sp.), as the description of 

 Gabb's Ammonites Cooperi immediately precedes that of 

 his Hamites Vancouver ensis. 



Heteroceras Hornbyense. (Kohl prov.) 



Shell dextral, depressed turbinate, much broader than 

 high, and composed, so far as is known, of five or six 

 rounded, ventricose volutions, which are in close contact 

 but without embracing ; spire moderately elevated ; umbi- 

 licus broad and deep, exposing the whole of the inner 

 volutions. 



Surface marked with simple and not very liexuous 

 transverse ribs. Upon the last volution one or two con- 

 tinuous ribs without tubercles alternate with a rib or pair 

 of ribs which bears or bear a small but rather prominent 

 tubercle on each side of the periphery. Usually two ribs 

 coalesce, both above and below, at each tubercle, but occa- 

 sionally a single thickened rib bears a pair of tubercles. 

 In places, also, where the test is preserved, the surface is 



