NORTH AMERICAN CONCHOLOGY. 41 



Class XII. MOLLIJSCA. 

 Order II. (Gasteropoda. 



Page. Name. Locality. 



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



21 Patella alveus Conrad. 



21 amoena Say. 



21 Crepidula fornicata Say. Very common on our coast. 



21 glauca Say. 



21 plana Say. Found in Nantucket harbor. 



Order III. Trackelipoda. 



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 heros Say. 



21 triseriata Say. 



Nerita intricata of Wood's Supplement. 

 21 Melampus videntatus Say. 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 Islandicus. 



Murex corneus Wood & Dill. 



F. comcus Say. 



21 cinereus Say. 



22 decemcostatus Say. 



Murex carinatus Pennant. 

 22 Ranella caudata. At Nantucket. 



Pyrula canalieulata. 



Manx canalieulata. 

 carica. 

 22 Nassa obsoleta Say. 



Buccinum novebor accuse Wood's Supplement. 

 22 trivittata Say. 



22 lunata Say. 



22 Purpura lapillus. 



Buccinum lapillus L. 

 22 imbricata Lam. 



22 Buccinum undatum L. 

 22 Columbella terpsichore. 



Buccinum terpsichore, Wood's Supplement. 



nq 



9.0. 



