Shells. 



ORDER II. PEDUNCULATA. 



Anatifa laev'is. 



Lepas anatifera of L. On the bottoms of ships. 

 Anatifa vitrea. 



Lepas fascicularis. Found at Nantucket. 

 Cineras vittatus. 



Lepas vittata, On ihe bottoms of ships. ^ 



CLASS XI. CONCHIFERA. 



ORDER I. BIMUSCULOSA. 



Teredo navalis. 



On the bottoms of ships, 

 Pholas crispata. 

 Solen ensis. 



viridis. 



Not common in the N. England States. 

 Solecurtus Cariboeus. 



Rare, found at New Bedford. 

 Solecurtus costatus, Say. 



Common at Nahant Beach. 

 Solecurtus fragilis. 



S. centralis of Say. Found at N. Bedford. 

 Mya mercenaria, Say. 



Common clam. 



Anatina convexa, Turton. Thracia of Blainville. 

 Anatina leana, Conrad. 



A. preetenuis? of Turton. At Nantucket. 

 Mactra solida. 

 Mrctra gigantea, Lam. 



M. Solidissima of Dillwyn. 

 Mactra subtruncata. 

 Mactra lateralis, Say. 

 Mactra subtriangulata. 



M. arctata of Conrad. Figured in the 

 supplement to Wood's "Index Testaceologicui." 

 Mactra tellinoides, Conrad. 

 Solemya velum, Say. 



Not uncommon at N. Bedford. 

 Amphidesma corbuloides. 



Mya Norwegicaof Wood and Dillwyn. 



M. hyalina of Conrad. 

 Corbula ferruginosa. 



Mya ferruginosa of Wood. Not described by Lamarck. 

 Pandora trilineata, Say. 



Found in Nantucket Harbor, 

 Petricola pholadiformis, Lam. 



P. fornicata, of Say. Very common. 

 Sanguinolaria fusca, Conrad. At Nantucket. 

 Tellina polita, Say, 



Found at N. Bedford. 



Lucina divaricata. A single valve found at Chatham. 

 Crassina danmoniensis. 



Astarte castanea of Say. Ocean shore at Nantucket. 

 Cyprina islandica. 



Venus Islandica of Linn. Common in Essex County. 

 Venus mercennaria. Common Quauhog or Round Clam. 



