4 University of Michigan 



Gastrocopta contractu (Say). Alcona County: Harrisville. 



Gastrocopta tappaniana (C. B. Adams). Alcona County: 

 Harrisville. 



Vertigo goiildii (Binney). Alcona County: Killmaster. 



Vertigo ovata Say. Alcona Comity : Harrisville. 



Cochlicopa liibrica (Miiller). Alcona County: Harrisville, 

 Greenbush. 



J'allonia pulchcUa (Miiller). Alcona County: Harrisville. 

 Garychiiiiii c.rigitiim (Say). Alcona County: Killmaster. 

 Carychium exile H. C. Lea. Alcona County: Harrisville. 

 Lynuuva catascopiiim Say. Crawford County. 

 Lyinncra obnissa Say. Alcona County : Killmaster, Pine 

 River. 



Lyuincca obnissa cxigna (Lea). Alcona County: Harris- 

 ville, Greenbush. 



Lymncca palustris ( Miiller ). Alcona County: Killmaster, 

 Pine River, Harrisville, Greenbush. 



Lymncca stagnalis appressa (Say). Crawford County. 



Planorbis antrosus Conrad. Oscoda County. Crawford 

 County. 



Planorbis circiunstriatus Tryon. Alcona County: Harris- 

 ville, Greenbush. 



Planorbis trivolvis Say. Alcona County : Greenbush, Kill- 

 master, Pine River. 



Pliysa anatina Lea. Alcona County : Killmaster, Pine River. 



Physa gyrina Say. Alcona County: Harrisville, Greenbush. 

 Crawford County. 



Physa gyrina ? Say, var. Alcona County : Killmaster, Pine 

 River. 



