382 ZOOLOGY. 



Family CAEDIADAE. 

 CAEDIUM NUTTALLI. 



Cardium Nuttalli, CONE. Jour. Acad. Phlla. VII, p. 229; pi. 17, f. 3. MIDDEND. Beitrage, III, p. 39; pi. xvi, f. 1-5. 



CARP. Rep., p. 307. 

 Hob. Shoalwater bay and Puget Sound ; Dr. Cooper. San Francisco; Dr. Bigelow, Dr. Traek. 



' ' 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." C. 



CARDIUM QUADRAGENARIUM. 



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

 Hob. 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. 



Ludna califarnica, CONRAD, Jour. Acad. Phila. VIII, p. 255, pi. 20, fig. 1 CARPENT. Eep. p. 307. 

 Hob. 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 description, 

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

 of our eastern species. 



Hah. Whidby's island, Straits of Fuca ; Dr. Cooper. Pools near Steilacoom ; Dr. Cooper. 



Family VENERIDAE- 

 VENUS STAMINEA. 



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



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



15-13. 

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



p. 420 ; Atlas, fig. 538. 



Tapes diversa, SOWB. Thes. pi. 146, fig. 41. No. 65.--CARP. Kep. p. 306. 

 Tapes straminae, CARPENTER, Rep. p. 196. 

 Saxidomus pelalii, IDEM. Eep. p. 299. 



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

 Trowbridge. 



We have brought together the above synomomy 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 "ashy white," as described by Dr. Gould, some 



