114 THE NAUTILUS. 



Zonites minusculus Biiin. 

 Zonites suppressus Say. 



Helicid.i-:. 



Patula striatella i^nth. 



Patula lineata Say. 



Panctum pygmaeum minutissimum Lea, 



Helix thyroides Say. 



Helix albolahris Say. 



PUPID.E. 



Papa contracta Say. 

 Vertigo sp. Cjuv.) 



SUCCINEID.E. 



Succinea avara Say. 

 Succinea obliqua Say. 

 Succinea ovalis Gould. 



LiMXAEID.E. 



Limncea catascopiiim Say. 

 Limncea humilis Say. 

 Planorbis trivolvus Say. 

 Planorhis hicarinatus Say. 

 Planorbis parvus Say. 

 Planorbula armigera Say. 

 Ancylus rivula^'is Say. 

 Physid.e. 



Physa ancillaria Say. 



AURICULID.E. 



Carychium exiguum Say. 



VlVIPAKID^. 



Campeloma dedsum Say. 

 Lioplax subcarinata Say. 



Amnicolid.e. 



Amnicola limosa Say. 

 Amnieola grana Say. 

 Poviatiopsis lapidaria Say. 

 Somato gyrus altilis Lea. 



Valvatid.^. 



Valvata bicarinata Lea. 



