INDEX 



CLASSES, FAMILIES, GENERA, AND PLATES. 



[N.B. — The Classes are printed in Small Capitals, the Families in Italics, and 

 the Genera in the Ordinary Type.] 



Acasta . 

 Accra . 

 Achatina 



Alata 



Amphidesma 



Amphitritea 



Amphitrite 



Ampullaria 



Anastoma 



Anatifera 



Anatina 



Ancillaria 



Ancylus 



Annelides 



Anodonta 



Anomia 



Aplysiacea 



Aplysia . 



Area 



Arenicola 



Arcacea 



Argonauta 



Aspergillum 



Auricula 



Avicula 



Balanus 



Brachiopoda 



Buccinum 



Bulimus 



Bulla . 



Bullacea 



Bullaea . 



