THE KANSAN ICE INVASION 



231 



Sphaetium sulcatum (Lam.) 



striatinum (Lam.) 

 Afusculium transversum (Say) 

 Pisidium variable Prime. 



Helicina occulta Lamarck. 



Valvata tricarinata Say 

 " lewisii Currier 



A mnicola litnosa porata (Say) 



Campeloma ponderosum (Say) 



" subsolidum (Anthony) 



Pleurocera canalictdatum (Say) 

 " alveare (Conrad) 



Physa gyrina Say 



Planorbis antrosus Conrad 



antrosus striaius Baker 

 " trivolvis Say 



Galba caperata (Say) 

 obrussa (Say) 

 " humilis modicella (Say) 



Carychium exiguum (Say) 



Succinea ovalis Say 

 " avara Say 



Vallonia gracilicosla Reinh. 

 " parvula Sterki 



Cochlicopa lubrica (Miiller) 



Bifidaria armijera (Say) 



pentodon (Say) =curvidens Say 



lMa Vide Sterki. 



Sphaeriidae 



Pisidium medianum Sterki 

 abditum (Hald.) 

 " compression (Prime) 



GASTROPODA 

 Helicinidae 



Valvatidae 



Valvata sincera Say ? 



Amnicolidae 



Pomaliopsis lapidaria (Say) 

 Viviparidae 



Lioplax cyclostomatijortnis (Lea) 



Pleuroceridae 



Pleurocera unciale (Hald.) 

 " species. 



Physidae 



Physa species 

 Planorbidae 



Planorbis parvus Say 

 " deflectus Say 

 " exacuous Say 



Lymnaeidae 



Galba paluslris (Miiller) 

 " catascopium (Say) 

 Pseudosuccinea columella (Say) 



Auriculidae 



Carychium exile H.C. Lea. 

 Succineidae 



Succinea grosvenorii Lea 

 " retusa Lea 



Valloniidae 



Vallonia pidchella (Miiller) 



COCHLICOPIDAE 



Pupillidae 



Pupilla blandi (Morse) 

 Vertigo milium (Gould) 14 * 1 



