107 



Section Pierosoma Dall. 



Planorbis trivolvis Say (= fallax Hald., megastoma De Kay, lentus 

 of authors, not of Say).* 

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

 (Binney, UlfFers) ; Northern Illinois (Calkins) ; Joliet, Will Co. ; 

 Desplaines River (Ferriss); Quincy, Adams Co. (Garman) ; 

 East Branch Du Page River (Gault) ; Romeo and Joliet, Will ( !o. 

 (Handwerk); Kappa, Woodford Co.; Quincy, Adams Co. 

 (Hart); Kishwaukee and Little Wabash rivers ; Winnebago, 

 Washington, and Hardin counties; Seifert, Perry Co. (Hink- 

 ley) ; La Salle Co. (Huett) ; Crystal Lake, McHenry Co.(Lyon) ; 

 Eastern Illinois; Mercer Co. (Marsh); Athens, Menard Co.; 

 Fox River, Algonquin and Silver Lake, McHenry Co.; Elgin, 

 Kane Co. (Nason) ; Fulton Co. (Wolf) ; Saline Co. ; Champaign 

 Co. ; Peoria, Peoria Co. ; Quiver Lake, Havana, Mason Co. ; Cy- 

 press Creek, Johnson Co. ; Cedar Lake, Lake Co. ; Dug Hill and 

 Miller's Pond, Union Co. ; Washington Co. ; Thompson's Lake, 

 Fulton Co. ; Pekin, Tazewell Co. ; Taylorville, Christian Co. ; 

 Northern Illinois; Warsaw, Hancock Co. (State Laboratory). 



Planorbis trivolvis macrostoma Whiteaves. 



Desplaines River, Will Co. (Ferriss); Northern Illinois 

 (Marsh) ; Fox River and Algonquin, McHenry Co. (Nason). 



Planorbis trunoatus Miles. 



Cook Co. (Baker, Higley, Jensen). 



Planorbis sampsoni Ancey. 



Athens, Menard Co., collected by E. Hall (Nautilus, IX., p. 

 36, 1895). 



Section PlanorbeUa Haldeman. 



Planorbis campanulatus Say. 



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

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

 riss) ; Romeo and Joliet, Will Co. (Handwerk); Quincy, Adams 

 Co. (Hart); Winnebago Co. (Hinkley, Marsh): Crystal Lake, 

 McHenry Co. (Lyon) ; Silver and Crystal lakes and Algonquin, 

 McHenry Co. (Nason) ; McHenry Co. (Stearns): Southern Illi- 

 nois (Ultf'ers) ; Milan, Rock Island (Jo. ; Clear, Cedar, Sand, Fox, 



*The references to Planorbis lentus Say from Illinois are extremely doubtful, as il 

 is essentially a southern species. It is reported from the following localities: Winne- 

 bago Co. (Hinkley); Mercer Co. (Marsh). (See Nautilus, III., p. 23.) 



