382 ZOOLOGY. 



Family CARDIADAE, 

 CARDIUM NUTTALLI. 



Cardium JVwMaKi, CONR. Jour. Acad. Phila. VII, p. 229; pi. 17, f. 3. MIDDEND. Beitrage, III, p. 39; pi. xvi, f. 



1_5. CARP. Rep. p. 307. 

 Hab. Shoal water bay and Puget Sound ; Dr. Cooper. San Francisco; Dr. Bigelow, Dr. Trask. 



This large shell is the most abundant of the clams in Shoalwater bay, and is very much used 

 as food. It inhabits a mixture of sand and mud, a few inches from the surface, in all parts of 

 the bay about half way between the shores and the large channels. The Indians are very 

 expert in finding them, getting numbers where a stranger can see no sign of their existence, 

 by feeling for them with a knife or flat stick. In July many come to the surface and die, 

 perhaps from the heat of the sun.&quot; C. 



CARDIUM QUADRAGENARIUM. 



Cardium quadragenarium, CONR. Jour. Acad. Phila. VII, p. 230; pi. 17, f. 5. CARP. Rep. p. 307. 

 Hab. San Luis Obispo ; Dr. Antisell, U. S. A- 



A valve of this rare species was obtained by Dr. Antisell at the above locality. 



Family LUCINIDAE, 

 LUCINA CALIFORNICA. 



Lucina californica, CONRAD, Jour. Acad. Phila. VIII, p. 255, pi. 20, fig. 1. CARPENT. Rep., p. 307. 

 Hab. San Diego; Mr. Cassidy. 



Family CYCLADIDAE. 



CYCLAS, n. s.? 



Dr. Gould enumerates two species of this genus from Oregon, C. patella and C. egregia. Not having met with any descrip 

 tion, we are unable to determine whether either of them is identical with ours or not, or whether it may not be the same as one 

 of our eastern species. 



Hab. Whidby s island, Strait s of Fuca ; Dr. Cooper. Pools near Steilacoom ; Dr. Cooper. 



Family VENERIDAE. 

 VENUS STAMINEA. 



Venus staminea, CONR. Jour. Acad. Phila. VII, p. 250, pi. 19, fig. 14, 1837. 



Venerupis petitii, DESH. Rev. Zool. p. 359, 1839. IDEM, Mag. de Zool. pi. 39, 1841. MIDD. Beit. Ill, 51, pi. XVII, 



fig. 1513. 

 Venus rigida, GOULD, Proceed. Bost. Soc. N. H. Ill, p. 227, 1850. IDEM, U. S. Exploring Exped. Moll, and Shells, 



p. 420 ; Atlas, fig. 538. 



Tapes dicersa, Sown. Thes. pi. 146, fig. 41, No. 65. CARP. Rep. p. 306. 

 Tapes straminae, CARPENTER, Rep. p. 196. 

 Saxidomus petitii, IDEM, Rep. p. 299. 



Hab. Shoalwater bay and Puget Sound ; Dr. Cooper and Dr. Suckley San Francisco; Dr. Trask. San Diego ; Lieut. 

 Trowbridge. 



We have brought together the above synonymy after repeated examination and comparison 

 of specimens from distant localities between the Straits of Fuca and San Diego. The northern 

 shells are commonly but not invariably &quot;ashy white,&quot; as described by Dr. Gould, some 



