S4 



Sphwriu/n rhovihoideuni Prime. 



Winnebago Co. (Hinkiey, Marsh): Athens, Menard Go. (Na- 

 son) ; Sand and Fourth lalies, Lake Co. (vState Laboratory). 



Genus Musculium Link, 1807. 



{= Calyculma Clessin, 1872.) 



Miisctdiidti transiieriiuiH Say. 



Cook Co. (Baker, Calkins); Northern Illinois (Calkins): 

 Hickory Creek, Will Co. (Ferriss) : Joliet, Will Co. (Ferriss, 

 Handwerk); <^uincy, Adams Co. (Garman, Hart).; Desplaines 

 River (Handwerk) ; Winnebago Co.; Big and Little Muddy, 

 Wabash, Ohio, and Saline rivers (Hinkiey); Mercer Co. 

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

 Spring Bay, Peoria, Peoria Co.: (^)uiver and Matanzas lakes, 

 and Illinois River, Havana, Mason Co.; Thompson's Lake, Ful- 

 ton Co. ; Sidney and Urbana, Champaign Co. ; Bernadotle, 

 Spoon River, Fulton Co. ; Pekin Lake, Tazewell Co. ; Quincy, 

 Adams Co. ( State Laboratory ) . 



Miiscniium iruncatuni Linsley. 



Cook Co. (Baker, Jensen); Joliet, Desplaines River, Will 

 Co. (Ferriss, Handwerk); Kappa, Woodford Co. (Hart); Mer- 

 cer Co. (Marsh); Athens, Menard Co.; Canton, Fulton Co. 

 ( Nason ) ; Quincy, Adams ( 'o. ( Oakes) ; Urbana, Champaign Co. ; 

 Fox, Cedar, and Clear lakes, Lake Co. ; Phelps Lake, Fulton 

 Co.; Havana and Quiver Lake, Mason Co. ( State Laboratory ). 



Musculhii/i pnrtuincium Say. 



Cook Co. (Baker, Calkins) ; Northern Illinois (Calkins) ; Rock 

 Run, Joliet, Will Co. (Ferriss) ; La Salle Co. ( Huett) ; Crystal 

 Lake, McHeury Co. (Lyon); Eastern Illinois (JIarsh); Athens, 

 Menard Co. (Nason); Du Page Co. (Woodruff); Illinois River, 

 Havana, Mason (!o. ; Cedar Lake, Lake Co. : ditch, Urbana, 

 Champaign Co. (State Laboratory). 

 Mxisctilmm hodgsoni Sterki. 



Albion, Edwards Co. (Sterki).- 

 Nusrulhoii elevatu III Haldenian. 



Big Muddy River (Hinkiey). This species is typically of 

 southern distril)ution ( Florida and Alabama), and the present 

 record extends its range considerably to the north. 



