108 



and Fourth lakes, Lake Co. ; Pekin Lake, Tazewell Co. ; Ha- 

 vana, Mason Co. ; Fulton Co. ; McHenry Co. ; Lake Michigan, 

 Cook Co. ; Northern Illinois; Camp Point, Adams Co. (State 

 Laboratory). 



Subgenus Hippeutis Agassiz. 

 Section Menetus H. & A. Adams. 

 Planorbis exaeuous Say ( = exacutus of authors). 



Joliet, Will Co., Desplaines River (Ferriss) ; Winnebago Co. 

 (Hinkley) ; Mercer Co. (Marsh) ; Chicago, Cook Co. ; Algonquin, 

 McHenry Co.; Illinois River (Nason) ; Fulton Co. (Wolf); 

 (Quiver Lake and Havana, Mason Co.; Pistakee, Fourth, Fox, 

 Sand, Long, Cedar, and Slough lakes, and between Cedar and 

 Loon lakes, Lake Co. ; Urbana, Champaign Co. ; Flag Lake, 

 Fulton Co. (State Laboratory). 



Subgenus Gyraulus Agassiz. 



Planorbis albus Miiller (= hirsutus Gould). 



Rockford, Winnebago Co.; Du Bois, Washington Co. (Hink- 

 ley); Algonquin, McHenry Co. ( Nason ); Pistakee and Cedar 

 lakes, Lake Co. ; Northern Illinois (State Laboratory). 



Planorbis cleflectus Say. 



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

 Salle Co. (Calkins, Huett) ; Desplaines River (Ferriss); Win- 

 nebago Co. (Hinkley) ; Will Co. (Marsh) ; Silver Lake and Al- 

 gonquin, McHenry Co. (Nason) ; Fulton Co. (Wolf) ; Cedar, Fox, 

 and Pistakee lakes, Lake Co. ; Quiver Creek and Quiver and 

 Dogfish lakes, Mason Co. ; McHenry Co. (State Laboratory). 



Section Tor qui* Dall. 



Planorbis parvus Say. 



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

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

 (Ferriss) ; Joliet, Will Co. (Ferriss, Handwerk) ; Romeo, Will 

 Co. (Handwerk) ; Rockford, Winnebago Co. (Hinkley) ; Mercer 

 Co. (Marsh) ; Algonquin, McHenry Co.; Quincy, Adams Co.; 

 Athens, Menard Co.; Elgin, Kane Co. (Nason); Fulton Co. 

 (Wolf) ; Thompson's Lake, Fulton Co.; Quiver, Dogfish, and 

 Matanzas lakes and Slough, Havana, Mason Co. ; Cedar, Pis- 

 takee, Sand, Fox, Fourth, and Slough lakes, Lake Co. ; Urbana, 

 < 'hampaign Co. (State Laboratory). 



