ZOOLOGY. 381 
Family AUG ADM. 
ARCA GRANDIS. 
Area grandis, Brod. & Sowerbt ; Reeve, C. I., pi. — ,f. 4 — CARrENTER, Report, p. 310. 
Hab. — San Diego ; Mr. Cassidy. 
A fine specimen of this remarkable Area, preserved entire in alcohol, was sent to the Smith- 
sonian Institution from San Diego by Mr. Cassidy, being the first instance in which it has 
occurred beyond the limits of the Panama province. 
Family UNIONIDi^. 
MARGARITANA MARGARITIFERA. 
Blargaritana rmrgaritifera, Lea, in Pliilad. Trans. 
Mya maTgaritifera, Linn. 
Margaritana fluviatilis, Schumacher. 
Alasmodonta falcata, Gocld, in Proc. Best. Soc, N- H., Ill, p. 294. — Idem, U. S. Exploring Ex., Mollus. & Sli.,pp. 
433, 434— Carp. Report, p. 309. 
Hab. — Chehalis and other rivers of Washington Territory, Dr. Cooper. Shasta river, Oregon, Dr. Trask. 
After a careful comparison of specimens from the above localities with others from the 
Atlantic States, as well as from Newfoundland and Europe, we are brought to the same 
conclusion as Mr. Lea, namely, that the northwestern shell is at most a slight variety of the 
well known M. margaritifera of Linnaius. 
' ' This is the most abundant of the fresh water bivalves, and the only one I have been able 
to find in the Chehalis, the streams emptying into Puget Sound, and most branches of the 
Columbia. No species is found in the streams running into Shoalwater bay. The Indians east 
of the Cascade mountains eat these, food of any kind being acceptable to most of them." — C. 
ANODONTA ANGULATA. 
Anodonta angulata, Lea, in Philo.s. Trans. 
Anodonta fteminalis, Gould, U. S Expl. Exped. Moll, and Shells, 436. — Carp. Rep., p. 309. 
Hab. — Yakima river, Washington Territory, Dr. Cooper. Walla-Walla river, Oregon, Dr. Pickering. 
Several perfect specimens of various ages were brought by Dr. Cooper from the above 
locality, where it appears to be plentiful. 
ANODONTA OREGONENSIS. 
Anodonta oregonensis, Lea, Philos. Trans.; pi. xxi, f. 67.— Carpenter, Eep., p. 309. 
Hab. — Rivers of Washington Territory; Dr. Cooper. 
ANODONTA WAHLAMATENSIS. 
Anodonta wdhlamatensis, Lea, in Philos. Trans.; pi. xx, f. 64. — Carp. Rep., p. 309. 
Hah. — Lagoons, Sacramento, Dr. Trask. Wahlamet river, Nuttall. 
The Californian specimens sent by Dr. Trask are larger and finer than those from the more 
northern habitats. 
