Shells. 



*1 



Pecten. 



Magellanicus. Rare in Ms. Common at Eastport Me. 



Islandicus. Pealeii, Conrad, Rare. 



concentricus, Say. Common Scallop. 

 Ostrea. 



Virginica. Common Oyster. 

 Anomia. 



ephippium.Abundant in N.Bedford. 



undulata. Is it a distinct species from the preceding 1 ? 



CLASS XII.— MOLLUSCA. 

 ORDER II.— GASTEROPODA. 

 Chiton. 



Found at Nantucket. Not described to my knowledge. 



Patella. 



alveus, Conrad, 

 amoena, Say. 

 Crepidula. 



fornicata, Say. Very common on our coast, 

 glauca, Say. 



plana, Say. Found in Nantucket Harbor. 



ORDER III — TRACHEUPODA 



Velutina. 



rupicola, Conrad. 

 Bulla. 



solitaria, Say. Is it a variety of B. hydatis 1 Found at 

 Holme's Hole. 



Natica. 



duplicata, Say. 

 heros, Say. 



triseriata, Say. Nerita intricata of Wood's Supplement. 

 Melampus. 



videntatus, Say. Common in salt marshes.At New Bedford. 

 Lacuna. 



pertusa, Conrad. 



Turbo. 



obligatus, Say. 

 irroratus, Say. 

 palliatus, Say. 



Turritella. 



bisuturalis, Say. 

 alternata, Say. 



Fusus 



Islandicus. Murex corneus, Wood and Dillwyn. Fusus ' 



corneus, Say. 



cinereus, Say. 



3 



