336 



other. It was collected by Captain Gardner who kindly lent it to the writer 

 for examination and description in 1898, and since then it has been 

 returned. 



This remarkable fossil is evidently much more closely allied to the 

 Hamites cylindraceus of European authors than is the small and slender 

 specimen from the Sucia Islands that the writer once doubtfully referred 

 to that species. The former seems to differ from H. cylindraceus only in 

 its much more distinctly defined, though rather narrow, annular costse, 

 and in the more numerous incisions in the lobes and saddles of its sutural 

 line. It may prove to be nothing more than a local or geographical 

 variety of H. cylindraceus, D'Orbigny describes the ribs of that species 

 by the phrase " costis simplicibus evanescentibus," and gives the length 

 of a specimen as 320 mm., or not quite thirteen inches. Pictet, on page 

 99 of the second volume of the Paleontologie Suisse, says that the ribs of 

 H. cylindi-aceus are " tres efTaces." 



Anisoceras Cooperi, Gabb. (Sp.) 



Plate 43, fig. 1. 



^ Aniiaonites Cooperi, Gabb. 1864. Geol. Surv. Calif., Palseont., vol. i., p. 69, pi. 14, 



figs. 23 and 23 a. 

 ? Hamites Vancouverensis, Gabb. 1864. Idem, vol. i, p. 70, pi. 13, fig. 18. 

 ? Hamites (? Anci/loccTcisJ Vancouverensis, Gabb. 1869. Idem, vol. ii, p. 212. 

 Heteroceras Cooperi (Gabb) Meek. 1876. Bull. Geol. and Geogr. Surv. Territ., vol. ir, 



p. 367, pi. 3, figs. 7 and 7 a. 

 Anisoceras Vancouverensis, Whiteave.s. 1895. Canad. Rec. Sc, vol. vi, p. 313, pi. ii ; and 

 (1896) Trans. Royal Soc. Canada for 1895, Second Series, vol. i, 

 sect. IV, p. 131. 



The name " .? Ammonites Cooperi" was proposed by Gabb for two or 

 three very much compressed fragments from near San Diego, the best of 

 which is figured on Plate 14- of the first volume of the Palpeontology of 

 California. This fragment does not give the least idea of the shape of 

 the shell, when entire, and its sculpture is thus described. "The surface 

 is ornamented by two rows of nodes (on the side 1 ) with ribs extending 

 across, some passing through one, some through two of the nodes ; while 

 others originate in one and end in another. By the peculiar arrange- 

 ment of the ribs, there are about a third more on the middle of the frag- 

 ment than on the margin«." A portion of the sutural line of this 

 specimen is also described and figured. 



In the same volume, Mr. Gabb describes and figures a specimen from 

 Comox, which seems to have a very similar kind of sculpture, under the 

 name Hatnites Vancouverensis. The figure of this specimen shews one 

 straight limb abruptly bent on itself, as in Hamites, but, in the second 



