OF THE MOLLUSCA OF IOWA. 



83 



List of Fossil Mollusca from the Loess (post plkiocene) of Iowa. 



Zonites arboreus Say. Fupa armifera Say. 

 viridulus Meiike.-CShimek) muscorum L. 



— minusculiis Binn. 



— limatulus Ward. — (Shi- 



mek). 

 —fulvus Drap.— (Call). 



Patula alternata Say. 



strigosa Gould. 



striatella Anthony. 



Helicodiscus lineatus Say. 

 Strohila labyrinthica Say. 

 Stenotrenia monodon Rackett. 

 Mesodon dausus Say. 



— imdtilineata Say. 



thyroides Say.— (Call). 



Vallonia pulchella Miiller. 

 Fupa pentadon Say. 



corticaria Say. — (Call). 



blandi Morse. — (Witter). 



Vertigo simplex Gould. — (Shimek). 

 Succinea obliqua Say. 



avara Say. 



Carychium exiguum Say. 

 Limnophysa desidiosa Say. 



humilis Say. 



caperata Say. — (Shi- 

 mek). 



Laptolimncea ? (Shimek). 



FhTjsa ? — (Shimek). 



Helicina occulta Say. 

 Pisidium ? - 



hiraek). 

 Ferrussacia subcylindrica Linn. 



Des Moines, May 4, 1888. 



