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LIFE OF THE PLEISTOCENE 



Vivipara subpurpurea (Say) 



" interlexta (Say) 

 Campdoma decisum (Say) 



Family Viviparidae 



Campeloma integrum (DeKay) 



integrum obesum (Lewis) 

 subsolidum (Anthony) 

 subsolidum exilis (Anthony)? 



Family Valvatidae 

 Valvata sincera Say Vahata tricarinata Say 



" lewisii Currier " tricarinata confusa Walker 



" bicarinata Lea " tricarinata simplex Gould 



" bicarinata perdepressa Walker " tricarinata unicarinala DeKay 



" obtusa Drap? " tricarinata infracarinata Vanatta 



Physa ancillaria Say 

 warreniana Lea 

 heterostropha Say 

 integra Haldeman 

 niagarensis Lea 

 sayii Tappan 



Ancylus parallelus Haldeman 

 " rivularis Say 

 " kirklandi Walker 



ORDER PULMONATA 

 Family Physidae 



Physa walkeri Crandall 

 " gyrina Say 

 " gyrina hildrethiana Lea 

 " elli plica Lea 

 " aplectoides Sterki 

 Aplexa hypnorum (L.) 



Family Ancylidae 



Ancylus fuscus Adams 

 Gundlachia species 



Planorbis trivolvis Say 

 binneyi Tryon 



" campanulatus Say 



" antrosus Conra.d = bicarinalus Say 

 antrosus striatus Baker 

 antrosus angistomus Haldeman 



" crista. Linn? 



" crista cristatus Drap. 



" rubellus Sterki 



Family Planorbidae 



Planorbis exactions Say 

 deflectus Say 



kirsutus Gould {^albus Miiller?) 

 altissimus Baker 

 parvus Say 



parvus urbanensis Baker 

 umbilicatellus Cockerel 

 Segmentina armigera (Say) 



Family Lymnaeidae 



Lymnaea stagnalis appressa (Say) 

 Pseudosuccinea columella (Say) 

 Acella haldemani (Desh.) Binney. 

 Galba caperata (Say) 



" parva (Lea) = tazewelliana Wolf 



" humilis modicella (Say) 



" humilis rustica (Lea) 



" obrussa (Say) = desidiosa Authors 



" obrussa decampi (Streng) 



" obrussa exigua (Lea) 



Galba galbana (Say) 



" dalli (Baker) 



" anticostiana (Dall) 



" bakeri (Walker) 



" palustris (Miiller) 



" reflexa (Say) 



" nashotahensis (Baker) 



" catascopium (Say) 



" emarginata canadensis (Sowerby) 



