86 UNIVERSITY OF COLORADO STUDIES 



Order Teleodesmacea 



Superfamily Cyrenacea 

 Family Sphaeriidae 



Genera Spharium, 4 sp. 

 Calyculina, 3 sp. 

 Pisidium, 5 sp. 



CLASS GASTROPODA (Univalves) 



Subclass Anisopleura 

 Superorder Euthyneura 

 Order Pulmonata 



Suborder Stylorixmatophora 

 Family Helicidae 



Genera Oreolielix, 3 sp. and var. 

 Thysanophora, i sp. 

 Polygyra, i sp. 

 Family Pupillidae 



Genera Pupoides, 2 sp. 

 Pupilla, 3 sp. 

 Bifidaria, 2 sp. 

 Vertigo, 7 sp. & va. 

 Family Achatinidae 



Genus Cochlicopa, i sp. 

 Family Valloniidae 



Genus Vallonia, 3 sp. 

 Family Zonitidae 



Genera Vitrina, i sp. 

 Vitrea, i sp. 

 Euconulus, I sp. 

 Zonitoides, 3 sp. 



Family Liraacidae 



Genus Agriolimax, 2 sp. 

 Family Endodontidse 



Genera Pyramidula, 2 sp. 

 Helicodiscus, 2 sp. 

 Punctum, I sp. 

 Sphyradium, i sp. 

 Family Succineidae 



Genus Succinea, 8 sp. 

 Suborder Basommatophora 

 Family Limnaeidse 



Genera Limncea, 12 sp. and vai 

 Planorbis, 5 sp. 

 Family Ancylidae 



Genus Ancylus, 3 sp. 

 Family Physidae 



Genera Physa, 1 1 sp. 

 Aplexa, I sp. 



