175 



HiNNiTES, OR Spondylus. (Sp. undt.) 



Entrance to Departure Bay, V. I., in Division A ; J. Richardson, 1871. 

 Two very imperfect single valves. 



ExoGYRA. (Sp. undt.) 



Entrance to Departure Bay, Y. I., in Division A ; J. Richardson, 1871. 



An upper valve, rather more than an inch and a-half in height and a 

 little less than an inch in length, but imperfect round the margin, and 

 with the test exfoliated. 



Its shape is essentially the same as that of the corresponding valve of 

 the E. parasitica of Gabb* and the E. interrupta of Conrad, f both of which 

 are possibly varietal forms of the E. haliotoidea of Sowerby and other 

 EurojDean writers. These three shells have one character in common, 

 namely, that the keel or ridge on the up])er valve, which extends in a 

 gradually uncoiling spiral from the beaks to the base, is marginal or very 

 nearly so; whereas in the specimen now under consideration the central 

 and low^er portions of the keel are separated from the outer edge of the 

 valve by a rather wide space. 



OsTR^A. (Sp. undt.) 



Entrance to Departure Bay, V, I., in Division A ; J. Richardson, 1871. 

 Fragments only of a very large, massive species, whose test is eleven 

 lines, or nearly an inch in thickness in the middle. The outer surface of 

 the shell is either exfoliated or else buried under the rock. 



Anomia Vancouverensis, Gabb. 



Plate 20, figures 5, 5a, 5b, 5c and 5d. 



Anoviia Vancouverensis, Gabb.— Pal Cal., Vol. II., p. 202, pi. 33, fig. 102. 

 Compare Anomia lineata, Gabb.— lb., Vol. I., p. 203, pi. 26, fig. 193. 



Two species of Anomia are described and figured in the " Palaeontology 

 of California." The first of these is the Anomia lineata, of which only 

 the upper valve is known, and which is stated to be common at several 

 localities in California, in the Chico Group. Its principal characters are 

 summarized by Mr. Gabb as follows : •' Shell thin, variable in shape ; 

 commonest form subcircular, often obliquely truncated on the right side ; 



* Paleontology of California, vol. I., p. 205, pi. ae, figs. I92a, to, and pi. 31, fig. 273a. 

 t Jom-nal of tlie Academy of Natural Sciences of Pmiadelpliia, Vol. 3, Second Series, p. 330, 

 pl.'34, ng. 15. 



