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LIFE OF THE PLEISTOCENE 



Pahideslrina nickliniana (Lea). 

 Bythinella tenuipes Couper 



VlVIPARIDAE 



Vivipara intertexta (Say) 



" subpurpiirea Say 



Campeloma decisum (Say) 



ponierosum (Say) 



subsolidum (Anthony) 



subsolidum exilis (Anthony). 



integrum (DeKay) 



integrum obesum (Lewis) 



Lioplax cydostomatiformis (Lea) 



Valvatidae 



Valvuta sincera (Say) 



" lewisii Currier 



" obtusa Drap 



" tricarinata (Say) 



" tricarinata confusa Walker 



" tricarinata simplex Gould 



" tricarinata unicarinata DeKay 



" tricarinata injracarinata Vanatta. 



" bicarinata (Lea) 



" bicarinata perdepressa Walker 



PULMONATA 



Physidae 

 Pkysa heterostropha Say 



" Sayii Tappan 



" ancillaria Say 



" warreniana Lea 



" integra Haldeman 



" niagarensis Lea 



" walkeri Crandall 



" gyrina Say 



" gyrina hildrethiana Lea 



" elliptica Lea 



" aplectoides Sterki 



Aplexa kypnorum (Linn.) 



Ancylidae 



Gundlachia species 



Ancylus parallelus Haldeman t 



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