NEW YOBK STATE MUSEUM 



FAMILY. 



Unionidse . . . 



Corbiculidae . 

 Strepomatidse 

 Rissoidse .... 



Valvatidse . 

 Viviparidae 



Auriculidae 

 Limnaeidae. 



Selenitidae 

 Limacidse 



Helicidae . 



Pupidae 



Shenogyridae 

 Succinidae . . . 



Genus. 



Unio 



Margaritana 



Anodonta 



Sphaerium 



Pisidium 



Goniobasis 



Pleurocera 



Bythinia 



Bythinella 



Gillia 



Somatogyrus 



Amnicola 



Pomatiopsis 



Lyogyrus 



Valvata 



Vivipora , 



Melantho , 



Lioplax , 



Carychium , 



Limnsea 



Physa 



Bulinus 



Planorbis 



Segmentina 



Aticylus 



Macrocyclis 



Limax 



Zonites 



Vitrina 



Patula 



Helicodiscus 



Strobila 



Stenotrema 



Vallonia 



Triodopsis 



Mesodon 



Pupa 



Vertigo 



Ferussacia 



Succinea 



No. in 

 this list. 



No. from 



other 

 sources. 



1 

 1 

 1 

 4 

 3 

 6 

 4 

 1 

 3 



93 



1 



17 



No. in No. in 

 each each 

 genus. family. 



