109 



Planorbis dilatatus Gould. 



Carbondale, Jackson Co. (Hinkley). 



Section Armiger Hartinann. 



Planorbis crista Linne, 1758 (=nautileus Linne, 1767). 

 Algonquin, McHenry Co. (Nason). 



Genus Segmentina Fleming. 



Subgenus Planorbula Haldeman. 

 Segmentina armigera Say. 



Cook Co. (Baker, Calkins, Nason); Northern Illinois (Calk- 

 ins) ; La Salle Co. (Calkins, Huett) ; Desplaines River, Joliet, 

 Will Co. (Ferriss) ; Rockford, Winnebago Co. (Hinkley); Mer- 

 cer Co. (Marsh) ; Elgin, Kane Co. ; Silver and Crystal lakes and 

 Algonquin, McHenry Co. ; Athens, Menard Co. (Nason ) ; Fulton 

 Co. (Wolf); Glen Ellyn, Du Page Co. (Woodruff); Quiver 

 Lake, Havana, Mason Co.; Urbana, Champaign Co. ; Fourth 

 Lake, Lake Co. ; McHenry Co. (State Laboratory). 



Superfamily Akteophila. 



Family AURICULID^E. 



Genus Carychium Miiller. 



Carychium exiguum Say. 



Cook Co. (Baker, Jensen); Northern Illinois; Fox River 

 (Calkins); La Salle Co. (Calkins, Huett); Joliet, Will Co. 

 (Ferriss); Lilycash Creek, Will Co. (Handwerk ) ; Rockford, 

 Winnebago Co. ; Du Bois, Washington Co. (Hinkley) ; Mercer 

 Co. (Marsh); Elgin, Kane Co.; Algonquin, McHenry Co.: 

 Athens, Menard Co. (Nason) ; Fulton Co. (Wolf). 



Carychium exile H. C. Lea. 



Oregon, Ogle Co. (Baker) ; Cook Co. (Baker, Higley, Jensen) ; 

 Joliet, Will Co. (Ferriss); Algonquin, McHenry Co. (Nason). 



