78 



Pleurobema cicatricosa Say (= varlcosa Say). 



Ohio River (Marsh) : Southern Illinois (Ulffers). 



TETRAGENE/E. 



Genus Quadrula (Rafinesque) Agassiz. 

 Section Crenodonta Schliiter. 



Quadrula pticata Say. 



Cook Co. ; Savanna, Carroll Co. (Baker) ; Northern Illinois 

 (Calkins); Kankakee River ( Ferriss, Handwerk) ; Desplaines 

 River (Handwerk) ; Illinois River (Handwerk, Kelly, Strode) ; 

 Quincy, Adams Co. (Hart); all rivers visited (Hinkley); La 

 Salle Co. (Huett) ; Spoon River (Kelly, Strode); Mississippi 

 River, Mercer Co. (Marsh) ; Quincy, Adams Co. ; Athens, Me- 

 nard Co. (Nason); Southern Illinois (Ulffers); Fulton Co. 

 (Wolf) ; Havana, Mason Co. (State Laboratory). 



Quadrula undulata Barnes. 



Oregon, Ogle Co.; Cook Co. (Baker); Savanna, Carroll Co. 

 (Baker, Jensen); Northern Illinois; Vermilion and Illinois 

 rivers (Calkins, Handwerk) ; Peoria, Peoria Co. (Chamberlain) ; 

 Kankakee River ( Ferriss, Handwerk) ; Starved Rock, La Salle 

 Co. (Handwerk); Mackinaw River, Kappa, Woodford Co. 

 ( Hart) ; Winnebago Co. ; Big Muddy, Little Muddy, and Saline 

 rivers (Hinkley); La Salle Co. (Huett); Desplaines River 

 (Lyon); Mercer Co., Edwards Creek (Marsh); Fox River, Al- 

 gonquin, McHenry Co. (Nason) ; Fox River, Dundee, Kane Co. 

 (Nason, Swick) ; Spoon River (Strode) ; Fulton Co. (Wolf). 

 Quadrula heros Say (= multiplicata Lea). 



Savanna, Carroll Co. (Baker); Northern Illinois (Calkins); 

 Illinois River (Calkins, Handwerk, Kelly, Strode) ; Utica, 

 La Salle Co., in canal (Ferriss); Ottawa, La Salle Co. (Hand- 

 werk); Mississippi River, Quincy, Adams Co. ( Hart, Nason) ; 

 Kaskaskia, Wabash, Little Wabash, and Big Muddy rivers 

 (Hinkley) ; La Salle Co. (Huett) ; Spoon River (Kelly, Strode) ; 

 Drury Creek (Lyon) ; Mercer Co., Mississippi River (Marsh) ; 

 Athens, Menard Co. (Nason) ; Southern Illinois ( Ulffers) ; Ful- 

 ton Co. (Wolf) ; Havana, Mason Co. (State Laboratory). 



Quadrula trapezoides Lea (= interrupt us Say). 



Southern Illinois (Ulffers). This is a doubtful record and 

 should be substantiated. 



