THE IOWAN ICE INVASION 359 



Endodontic ae 

 Sphyr odium edentulum Pyramidula shimekii (Pilsbry) 



aiticola (Ingersoll) alternate (Say) 



Helicodiscus parallelus (Say) solitaria (Say) 



Pyramidula cronkliitei antlwnyi Pilsbry Orcohelix iowensis (Pilsbry) 

 perspectiva (Say) 



Zonitidae 

 Gastrodonta ligera (Say) Euconidus fulvus (Miiller) 



Zonitoides arborea (Say) Vitrea hammonis (Strom) 



" minuscula (Binney) " indentata (Say) 



" milium (Morse) 



ClRCINARIIDAE 



Circinaria coiicava (Say) 



Helictdae 



Polygyra monodon (Rackett) Pol 



" fraterna (Say) 

 " hirsuta (Say) 

 " clausa (Say) 

 " thyroides (Say) 



pennsylvanica (Green) 

 " elevata (Say) 



gyra multilineata (Say) 



' albolabris (Say) 



' albolabris alleni (Wetherby) 



' profunda (Say) 



' inflecta (Say) 



' appressa (Say) 



' divesta (Gould) 



VERTEBRATA 

 MAMMALIA 



Megatheriidae 

 Megalonyx jeffersoni (Desmarest) 



Tayassutdae 

 Tayassu lenis (Leidy) Platygonus compressus LeConte 



Cervtdae 

 Odocoileus virginianus (Zimm.) Cervus canadensis Erxlaben 



" whitneyi (Allen) 



Antilocapridae 

 Anlilocapra americana Ord. 



Bovidae 

 Bison bison L. Symbos cavifrons (Leidy) 



latifrons (Harlan) Ovibos moschatus Zimm. 



Elephantidae 

 Mammut americanum (Kerr) Elephas primigenius Blum. 



SCItTRTDAE 



Marmota monax (Linn.) 



Murtdae 

 Microtia species (reported as pennsylvanicus (Ord.) 



Geomyddae 

 Gtomys bursarius (Shaw) 



