AN 



ALPHABETICAL LIST OF GENERA, 



WITH THEIR DERIVATIONS. 



Page 



Acasta - - - - - 39 



ACERA ------ 155 



Achatina. Achates, an agate - - - 178 

 Ammonites. From Jupiter Amnion, who is repre- 

 sented with a ram's horn - - - 267 

 Amphidesma. Amphi, Gr., in the middle; desma, 



a ligament - - - - 76 



Amphitrite - - - - 33 



Ampullacera. Ampulla, a rounded vessel - 191 



Ampullaria. Do. - - - - 189 



Anastoma. Ana, Gr., backwards ; stoma, mouth 171 



Anatifa. Anas, a duck; fero, to bear - 41 



Anatina. Anatinus, that which belongs to a duck - 69 



Anatinella. The diminutive of Anatina - 72 



Ancillaria ----- 256 



Ancylus. A little handle; probably from the apex 



somewhat resembling a handle - - 185 



Anodonta. A, without; odos, a tooth, Gr. - 101 



Anomia ------ 132 



Aplysia ------ 157 



Arca. A boat - - 95 



