58 



LIFE OF THE PLEISTOCENE 



Pleurobema coccineum magnalacustris 



Crenodonta undulata 



Fusconaja undata 



Enrynia recta 



Lampsilis ventricosa 



Pisidium virginicum 



Stratum IV. 



Qaadrula pnstulosa 

 Fusconaja undata 

 Sphaerium acuminatum 

 Pisidium virginicum 



" compression (variable) 



" splendidulum 



" medianum 

 Goniobasis livescens depygis 

 Amnicola limosa 



" lustrica 



Stratum IV. 

 Pisidiu m virgin icum 

 " compression 

 " splendidulum 

 Sphaerium occidentale 

 Sphaerium acuminatum 

 Goniobasis livescens depygis 

 Campeloma integrum obesum 

 Valvata tricarinata 



" tricarinata simplex 

 " tricarinata conjusa 

 Amnicola lustrica 



(One 



Goniobasis livescens depygis 

 Vavata tricarinata 

 Amnicola limosa 

 " lustrica 

 Physa warreniana 

 Planorbis defiectus 



foot from bottom) 



Valvata tricarinata 



" tricarinata simplex 

 " tricarinata conjusa 

 " tricarinata unicarinata 



Planorbis antrosus 

 " parvus 

 " dejiectus 



Physa warreniana 



Galba obrussa exigua 

 " palustris 



(Two feet from bottom) 



Amnicola limosa 



Physa -warreniana 



" inlegra 



" walkcri 



Planorbis antrosus 



campanulalus 

 parvus 

 " dejiectus 

 Galba obrussa decampi 

 " palustris 

 " woodriiffi 



Stratum IV. (Three 

 Sphaerium acuminatum 

 Pisidium virginicum 



" compressum 



" jallax 



" splendidulum 



" medianum 

 Goniobasis livescens depygis 

 Campeloma integrum (1 reversed) 

 Amnicola limosa (many forms) 



" lustrica 



feet from bottom) 

 Valvata tricarinata 



" tricarinata simplex 



" tricarinata conjusa 

 Physa warreniana 



" Integra 



" walkeri 

 Planorbis antrosus 



" campanulalus 



" parvus 



" defiectus 

 Segmenlina armigera (1 spec.) 



Stratum IV (Top of sand deposit) 

 Elliptio gibbosus A mnicola limosa 



Sphaerium acuminatum " lustrica 



Pisidium virginicum Physa inlegra 



Goniobasis livescens Planorbis parvus 



Valvata tricarinata Galba obrussa 



" palustris 



