THE LIFE OF GLACIAL LAKE CHICAGO 



99 



Amnicola cincinnatiensis 



" letsoni 



Somatogyrus subglobosus 



integer 



Paludestrina nickliniana 



Pomatiopsis lapidaria 



Pleurocera elevatum 



" elevatum lewisii 



" subulare 



Goniobasis livescens 



depygis 



Physa warreniana 



" integra 



" walkeri 



" gyrina 



" heterostropha 



Aplexa hypnorum 



Ancylus parallelus 



" fuscus 



" rimdaris 



" tardus 



Planorbis antrosus 



" campanulatus 



" truncatus 



" trivolvis 



" parvus 



" exactions 



" deflechts 



Segmenting armigera 



Lymnaea stagnalis appressa 



Pseudosuccinea columella 



columella clialybea.. 



Galba caperata 



parva 



parva sterkii 



humilis modicella 



obrussa 



obrussa exigua 



obrussa decampi 



palustris 



elodes 



elodes jolietensis 



Post- 

 Glacial 64 



reflexa. 



Recent 



Lake 

 Michigan 



Small 

 lakes 



Rivers 



Sloughs; 

 swamps 



