442 



FRANK COLLINS BAKER 



TABLE II— Continued 

 Comparison of Fossil Faunas 



Ohio 



Pisidium compressum, var. 



Pisidium pauperculum 

 Pisidium noveboracense 



Pisidium variabile 

 Pisidium tenuissimum 

 Pisidium medianum 

 Valvata tricarinata 

 Valvata tricarinata perconfusa 

 Valvata tricarinata unicarinata 

 Valvata sincera 

 Amnicola walkeri 

 Amnicola lustrica, var. 



Amnicola winkleyi leightoni 



Ferrissia parallela 

 Physa anatina 



Planorbis campanulatus 

 Planorbis antrosus 

 Planorbis antrosus striatus 

 Planorbis altissimus 



Planorbis deflectus 

 Planorbis hirsutus 

 Planorbis exacuous 

 Galba palustris 

 Galba obrussa decampi 



Indiana 



Pisidium compressum 

 Pisidium cruciatum 

 Pisidium kirklandi 

 Pisidium fallax 

 Pisidium pauperculum 

 Pisidium noveboracense 

 Pisidium abditum 



Valvata tricarinata 



Amnicola walkeri 



Amnicola lustrica 

 Amnicola limosa parva 



Pyrgulopsis sheldoni 

 Somatogyrus depressus 

 Pomatiopsis lapidaria 

 Pomatiopsis cincinnatiensis 

 Goniobasis semicarinata 

 Campeloma integrum obesum 



Ferrissia rivularis 



Physa crandalli 



Planorbis antrosus 



Planorbis parvus 



Galba humilis modicella 



