NORTH AMERICAN CONCHOLOGY. 41 



Class XII. MOLLUSCA. 

 Order II. Gasteropoda. 



Page. Ifame. Locality. 



21 Chiton. Not described to mj knowledge. Found at Nantucket. 



21 Patella alveus Conrad. 



21 amcena Say. 



21 Crepidula fornicata Smj. Very common on our coast. 



21 glauca Saij. 



21 plana Say. Found in Nantucket harbor. 



Order III. Traclielipoda. 

 21 Velutina rupicola Conrad. 

 '21 Bulla solitaria Say. Found at Holme's Hole. 



Is it a variety of B. hydatis? 

 21 Natica duplicata Say. 

 21 her OS Say. 



21 triseriata Say. 



Nerlta iniricata of Wood's Supplement. 

 21 Melampus videntatus /Sa//. Common in salt marshes, N. Bed. 



21 Lacuna pertusa Conrad. 

 21 Turbo obligatus Say. 

 21 irroratus Say. 



21 palliatus Say. 



21 Turritella bisuturalis Say. 

 21 alternata Say. 



21 Fusus Islaudicus. 



Murex corneus Wood & Dill. 



F. corneus Say. 



21 cinereus Say. 



22 decemcostatus Say. 



Murcx airinutus Pennant. 

 22 Ranella caudata. At Nantucket. 



Pyrula canaliculata. 



Murcx canaliculata. 

 carica. 

 22 Nassa obsoleta Say. 



IJuccinum noveboracense Wood's Supplement. p 



22 trivittata Say. 



22 lunata Say. 



22 Purpura lapillus. 



Buccinum lapillus L. 

 22 imbricata Lam. 



22 Buccinum undatum L. 

 22 Columbella terpsichore. 



Buccinum terjisichore, Wood's Supplement. 



90. 



9 '7 



