Shells. . 557 



Nerita intricata of Wood's Supplement. 

 Tornatella. 



Common in salt marshes. Not described. 

 Lacuna pertusa, Conrad. 

 Turbo obligatus, Say. 



Very common in Buzzard's Bay. 

 Turbo palliatus, Say. 

 Turbo calathiseus. 



Figured by Wood and described by Dillwyn. Very minute. 

 Turritellabisuturalis, Say. 

 Fusus Islandicus. 



Murex corneus of Wood and Dillwyn. 



Fusus corneus of Say. 

 Fusus cinereus, Say. 

 Fusus decemcostatus, Say. 



Murex carinatus of Pennant. 

 Ranella caudata. At Nantucket. 

 Pyrula canaliculata. 



Murex canaliculata of Linn. 

 Pyrula carica. 

 Nassa obsoleta, Say. 



Buccinum noveboracense of Wood's Supplement. 



Murex carica of Lin. 

 Nassa trivittata. Say. 

 Purpura lapillus. 



Buccinum lapillus, Linn. 

 Purpura imbricata, Lam. 

 Buccinum undatum, Linn. 

 Columbella terpsichore. 



Buccinum Terpsichore of Wood's Supplement. 



ORDER IV. CEPHALOPODA. 



Spirula Peronii. 



Nautilus Spirula of Linn. 



Found on the ocean shore of Nantucket. 



List of Land and Fresh Water Shells in Massachusetts, so far 



they have been asccertained. 

 BY MR. JOHN MILTON EARLE, of Worcester. 



I. BIVALVES. 

 I. GENUS UNIO. Lam. 



Unio. 



complanatus, Lam. Purpureus, Say. 

 nasutus, Say Ponds in Essex and Plymouth Counties, 

 ochraceus, Say Ponds in Plymouth County, 

 radiatus^ay Do. and Essex Counties. 



II. GENUS ALASMADONTA. Say. 



Alasmadonta. 



margaritifera, Linn, arcuata, Barnes. 

 marginata Say, Blackstone River, 

 undulata, Say Do. and streams in Plymouth County. 



