337 



volume of the Palaeontology of California, Mr. Gabb refers it doubtfully 

 to Ancyloceras. Its surface is said to be "marked by numerous sharp 

 ribs crossing the shell, inclined obliquely forwards ; well marked, but 

 diminished in size on the ventral side ; largest laterally ; each rib carry- 

 ing a small flattened tubercle on the latero-dorsal angle ; some ribs in the 

 curve, on the ventral side, exhibit a tendency to tuberculation, but the 

 shell being broken off at that point, their presence cannot be certainly 

 determined. Interspaces between the ribs broadly concave." Its septum 

 is said to be unknown. 



Mr. Meek, in 1876, referred a large fragment from Comox, "with 

 much doubt, to the species described by Mr. Gabb under the name 

 Ammonites ? Cooperi" and describes and figures it under the name 

 Heteroceras Cooperi. This fragment does not give an\' idea of what the 

 shape of the entire shell was like. Its surface is said to be "ornamented 

 by^moderately distinct annular costse, which pass around rather obliquely. 

 Two rows of nodes also occur on the outer or dorsal side, at which points 

 the costte usually bifurcate." 



In 1893 and 1895 a few much more perfect specimens, which the writer 

 has identified with Ham,ites Vancouver ensis, were collected at Hornby 

 Island, and two of these were described at some length, under the name 

 Anisoceras Vancouverense, in the " Canadian Record of Science," for April, 

 1895. In this publication the largest and most perfect of these speci- 

 mens, which has since been presented to the Museum of the Survey by 

 Mr. Harvey, is figured in outline, This specimen, it is stated, " has 

 convinced the writer that Ham,ites Yancoiiverensis 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 Heteroceras 

 Cooperi, is probably a small piece of the abruptly bent part of Anisoceras 

 Vancouverense. "A similar fragment," now in the Survey collection, 

 " 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 proposed the name Ammonites 

 Coo) eri, are distorted pieces of A. Vancouverense, 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 Vancouverensis." On 

 the " similar fragment " from Hornby Island, referred to in the foregoing 

 quotation, the tubercles or nodes on each side of the venter are so prom- 

 inent, conical and pointed as to suggest the idea that they are spine bases. 



Since the paper in the " Record " was written, the writer has seen three 

 additional specimens of this species from Hornby Island, two of which 

 have been presented to the Survey Museum. One of these is the beauti- 



