8 SHELLS OF NEW ENGLAND. 
OSTREADA. 
Ostrea Boreas, Lam., etc.— Buzzard’s Bay. Litt. 
PECTENIDA. 
Pecten Macexuanicus, Lam. Gould, 132. (Ostrec’ 
Gmel.— Whole Coast. Lamin. Corall. 
P. Isuanpicus, Mill. Gould, 133, f. 89.— Eastport, Me. 
to Conn. Lamin. to Dp. 8. Corall. 
P. rrrapians, Lam. P.concentricus, Say, 1821. Gould, 
134, f. 88. (fide Phil.) — Litt. From Cape Ann 
southward. 
P. ruscus, Linsley, Conn. Cat. 126, desc. by Gould, 
Am. Jour. Sept. 1848. 
ARCADA. 
ARCA TRANSVERSA, Say, 1821. Gould, 96.— Cape Cod 
southward. Lamin. 
A. pexata, Say, 1821. Gould, 95, f. 60.— Cape Cod 
southward. Litt. Lamin. 
NUCULIDA. 
The absence of a byssus, the form of the branchie, 
the crenation of the foot, and the great development 
of the labial tentacles, seem characters suflicient to 
separate this family from the Arcade. 
Nucuta proxima, Say. Gould, 103, f 63.— Lamin. 
Whole Coast. 
N. tenuis, Turt. Gould, 105, f. 64. Arca tenuis, Mont. 
Corall. 
