20 SHELLS OF NEW ENGLAND. 
MACTRIDA. 
Macrra LATERALIS, Say. Gould, 54, f. 34, 35.— Lamin. 
From Cape Ann southward. Creeks near Salem, 
( True.) 
M. ponperosa, Phil. M. ovalis, Gould, 53, f. 32. 
(preoc.) — Lamin. Eastport and Grand Manan, at 
low water mark, large and plentiful, (W. 8.) and 
southward to Cape Cod. 
M. souipissima, Chemn. Gould, 51.— Litt. et Lamin. 
Whole Coast. 
M. simiuis, Say, 1821.— Connecticut. 
DONACIDA. 
Mesopesma arctatum, Gould. Mactra arctata, Con., 
1830.— Lamin. Whole Coast. 
M. peauratum, Hanley. Mactra deaurata, Turt. Me- 
sodesma Jauresii, Joannis. Gould, 58, f. 38.— St. 
George’s Bank. ' 
TELLINIDZ. 
CuMINGIA TELLINOIDES, Con., 1830. Gould, 56, f. 36. 
—Lamin. From Cape Cod southward. An exam- 
ination of the animal of this species leads me to place 
it in this family rather than among the Mactride 
where it has been hitherto placed. 
Teviina Fusca, Phil. Sanguinolaria fusca, (Say, 1825.) 
Con. Gould. Tellina Gronlandica, Beck. (?) — Litt. 
Whole Coast. 
