Shells. 



19 



TerebeJla. 



conchilega, L. 



This has been subdivided into several species, two of which have 

 been seen on our shore, 

 Spirorbis. 



nautiloides. Serpula Spirorbis, ,L. On Sea weed 

 Serpula. 



vermicularis. 

 contortuplicata. 



CLASS X. — CIRRHIPEDA. 



ORDER I. — SESSILTA. 



Balanus. 



tintinnabulum. On the bottoms of Ships. 



ovularis. Lepas balanoides, Wood — on plank, timber, &c. 



miser. Very abundant on our rocks. 



punctatus, Montague. Lepas punctata, Wood 



and DiUwyn — also on our rocks, 

 fistulosus. 



ORDER II.— PEDUNCULATA. 

 Anatifa. 



laevis. Lepas anatifera L. On the bottoms of ships, 

 vitrea. Lepas vascicularis. Found at Nantucket. 

 Cineras. 



vittatus. Lepas vittata. On the 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. 



Caribaeus. Rare, found at New Bedford, 

 costatus, Say. Common at Nahant Beach, 

 fragilis. centralis, Say. Found at New Bedford. 



Mya. 



mercenaria, Say. Common Clam. 

 Anatina. 



convexa, Turton. Thracia of Blainville. 

 Leana, Conr&d. prcetenuis ? Turton. At Nantucket. 

 Mactra. 



solida. 



gigantea, Lam. Solidissima Dillwyn. 



subtruncata. 



lateralis, Say. 



subtriangulata. arctata, Conrad. Figured in the supplement to 

 Wood's ' Index Testaceologicus.' 



