102 



LIFE OF THE PLEISTOCENE 





Bowmanville 

 Shallow water 

 Cold temperate 



Calumet-Toleston 

 Deep water 

 Temperate 



Sag 



Low water 



Temperate 



! Hammond 

 Deep water 

 Temperate 



Low water 



Land surface-rivers 



Temperate 



Englewood 

 Shallow water 

 Temperate 



Recent 



Land surface-rivers 



Temperate 



Sphaerium flavum 



X 

 X 

 X 

 X 

 X 

 X 

 X 



X 

 X 



X 

 X 

 X 

 X 

 X 

 X 



X 

 X 

 X 

 X 









" sulcatum 





X 

 X 

 X 



X 



'' solidulum 







" stamineum 



X 











" ttriatinum... 



X 



X 







X 



" acuminatum 









" rhomboideum ... 



X 



X 



X 

 X 









" levissimum 











Musculium secure .. 







X 

 X 

 X 

 X 

 X 









" transversum. . . 











X 



X 



Pisidium affine 



X 



X 



X 

 X 



X 

 X 







" compressum 





X 





" compressum laevigalum .. 







" idahoense 



X 

 X 













" tar labile 



X 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



X 





X 





" kirklandi.. 







" scutellatum .. 





X 











" noveboracense 





X 

 X 









" virginicum 





X 



X 



X 









" walkeri . 











" politum 













" politum decorum 













" splendidulum 





X 



X 









" sargenti 











" pauperculum 





X 











" abditum? 













Valvala tricarinata 



X 





X 





X 





Somatogyrus subglobosus 









Amnicola emarginata 



X 



X 













" limosa 



X 



X 





X 

 X 





" limosa porata 







" lustrica 



X 





X 







" letsoni 



X 









Pleurocera elevatum 





X 

 X 



X 











Goniobasis livescens 



X 

 X 

 X 



X 



X 











Campeloma integrum 



X 









integrum obesum 









subsolidum 



X 



X 

 X 









X 



Physa warreniana 



X 



X 



















