22 THE NAUTILUS. 



stamineum. Twenty-two specimens from three localities show very 

 little variation. 



I take great pleasure in naming this variety in honor of Prof. S. 

 A. Forbes, Director of the Illinois State Laboratory of Natural 

 History. 



LIST OF WISCONSIN SHELLS. 



C. H. CHADWICK. 



(Continued) 



C. FRESH-WATER UNIVALVES. 

 Carychium exiguum Say. Milwaukee. 



" " exile H. C. Lea. Milwaukee. 



Limnsea stagnalis appressa Say. Menomonee River ; Oak Creek 

 near South Milwaukee ; Okauchee Lake and Dela- 

 field, Waukesha Co., Two Rivers, Manitowoc Co. ; 

 Lake Winnebago near High Cliff. 



" columella Say. Mill-pond at Delafield, Waukesha Co. 

 '" megasoma Say. Molas Creek, Manitowoc Co. 

 " reflexa Say. Milwaukee and vicinity (abundant); Oak 

 Creek, South Milwaukee ; Sand Ridge Creek, Kenosha 

 Co.; Delafield, Waukesha Co. 



" palustris Miiller. Vicinity of Milwaukee ; North shore 

 of Lake Winnebago. (" Var. micltiganensis " Walker 

 is included). 

 catascopium Say. Lake Michigan at Milwaukee. 



" " var. approaching L. emarginata Say. Lake 



Micl). 



'* caperata Say. Vicinity of Milwaukee; Lake Winnebago. 

 " " umbilicata Adams. Milwaukee and southwest- 



ward ; Sand Ridge Creek, Kenosha. 

 " humilis Say. Milwaukee (scarce). 



" desidiosa Say. Milwaukee and vicinity (abundant); Two 

 Rivers, Manitowoc Co.; North shore of Lake Winne- 

 bago. 



Planorbis trii'olvis Sny. Milwaukee (common); Delafield and 

 Okauchee, Waukesha Co.; Two Rivers, Manitowoc 

 Co. 

 " frivol vis (large form). Molas Creek, Manitowoc Co. 



