OF THE MOLLUSC A OF IOWA. 



83 



LIST OF FOSSIL MOLLUSCA FROM THB LOESS (POST PLEIOCENE) OF IOWA. 

 Zonites arboreus Say. Pupa armifera Say. 



viridulus Menke.-(Shimek) muscorum L. 



minusculus Binn. corticaria Say. (Call). 



limatulus Ward. (Shi- 



mek). 



fulvus Drap. (Call). 



Patula alternata Say. 



strigosa Gould. 



striatella Anthony. 



Helicodiscus lineatus Say. 

 Strobila labyrinthica Say. 

 Stenotrema monodon Rackett. 

 Mesodon clausus Say. 



multilineata Say. 



thyroides Say. (Call). 



Vallonia pulchella Muller. 

 Pupapentadon Say. 



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). 



Physa 



-? (Shimek). 



Helicina occulta Say. 



Pisidium ? (Shimek). 



Ferrussacia subcylindrica Linn. 



Des Moines, May 4, 1888. 



