84 



Sphcerium rhomboideum Prime. 



Winnebago Co. ( Hinkley, Marsh ) ; Athens, Menard Co. (Na- 

 son) ; Sand and Fourth lakes, Lake Co. (State Laboratory). 



Genus Musculium Link, 1807. 



(= Calyculina Clessin, 1872.) 



Musculium transversum Say. 



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

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

 Handwerk); Quincy, Adams Co. (Garman, Hart): Desplaines 

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

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

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

 Spring Bay, Peoria, Peoria Co. : Quiver and Matanzas lakes, 

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

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

 Spoon Piver, Fulton Co. : Pekin Lake, Tazewell Co. ; Quincy, 

 Adams Co. (State Laboratory). 



Musculium truncatum Linsley. 



Cook Co. (Baker, Jensen): Joliet, Desplaines Piver, Will 

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

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

 (Nason) ; Quincy, Adams Co. (Cakes) ; Urbana, Champaign Co. ; 

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

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



Musculium partumeium Say. 



Cook Co. ( Baker, Calkins ) ; Northern Illinois ( ( "alkins ) ; Pock 

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

 Lake, McHenry Co. (Lyon); Eastern Illinois (Marsh); Athens, 

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

 Havana, Mason Co. ; Cedar Lake, Lake Co. ; ditch, Urbana, 

 Champaign Co. (State Laboratory). 



Musculium hodgsoni Sterki. 



Albion, Edwards Co. (Sterki). 



Musculium elevatum Haldeman. 



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

 southern distribution (Florida and Alabama), and the present 

 record extends its range considerably to the north. 



