SUMMARY OF THE LIFE OF THE PLEISTOCENE 



385 





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Ph 



a 



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V 

 V 



OJ 



Pi 



Pisidium venlricosum (Prime) 















X 



X 

 X 

 X 

 X 

 X 

 X 



X 



X 



X 



X 



" ventricosum cosiaium Sterki 















X 



" vesiculate Sterki? 















X 



" virginicum (Gmelin) 











X 

 X 





X 



" walkeri Sterki 











X 



" politum Sterki 











X 



" politum decorum Sterki 















X 



GASTROPODA 



Helicinidae 







X 



X 



X 



X 

 X 

 X 



X 





Pleitrocertdae 









































X 

 X 

 X 

 X 









" alavere (Conrad) 





























































X 

 X 

 X 

 X 





















haldemani Tryon 











X 



X 



X 







































X 





X 



Amnicoltdae 

 Pyrgulopsis scalarijormis Wolf 













X 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 













X 



X 

 X 

 X 

















" limosa porata (Say) 









X 





" limosa paroa (Lea) 











" emarginata (Kiister) 







X 





X 

 X 







" cincinnatiensis (Lea) 









" lustrica Pilsbry 













" letsoni Walker 

















" galbana (Say) 



X 



































X 























X 

 X 





sttbglobosus (Say) 











X 

 X 







depressus Tryon 





























