SUMMARY OF THE LIFE OF THE PLEISTOCENE 



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Ancylus rivularis Say 



" fuscus Adams 



" tardus Say 



" kirklandi Walker.. 



Planorbidae 



Segmentina armigcra (Say) 



Planorbis trivohis Say 



" bimteyi Tryon 



" campamdatus Say 



" antrosus Conrad 



" anlrosus strialns Baker 



" anlrosus angistomus Haldeman. 



" altissimus Baker 



" exactions Say 



" rubellus Sterki 



" deflectus Say 



" itmbilicatellus Cockerell 



" hirsulus Gould 



" dilata/us Gould 



" parvus Say 



" parous urbanensis Baker 



" crista Linn ? 



" crista cristata Drap 



Lymnaeidae 



Lymnaea stagnalis appressa (Say) 



Pseudosuccinea columella (Say) 



Acella haldemani (Desh. Binn.) 



Galba caperata (Say) 



" pansa (Lea) 



" dalli (Baker) 



" kumilis modicella (Say) 



" humilis rustica (Lea) 



" obrtissa (Say) 



" obrussa decampi (Streng) 



" obrussa exiqua (Lea) 



" galbana CSay) 



" anlicostiana (Dall) 



" bakeri (Walker) 



" palustris (Miiller) 



" reflexa (Say) 



" elodes (Say) 



" nashotahensis (Baker) 



a 



& 



