to 



0f 



antr 



By J. 0. MANSEL-PLEYDELL, F.L-S-, F.G-S. 



PEEFACE . . 



ACHATINA 



acicula . . 



ANCYLUS 



Capuloides 

 fluviatilis 

 gibbosus . 

 lacustris 

 oblongus 



ANODONTA 

 anatina 



rostrata 



AEION 



ater 



hortensis 

 AZECA tridens 



BALE A fragilis 



BALIA 



perversa 



76-78 



124 



124 



96 

 96 

 96 

 96 

 96 

 96 



82 

 82 

 82 

 82 



97 



97 



98 



123 



121 



121 

 121 



