81 



sippi River (Calkins) ; Wabash and Ohio rivers (Hinkley) ; La 

 Salle Co. (Huett); Ohio River (Marsh); Spoon and Illinois 

 rivers (Strode). 



Quadrula coccinea Conrad ( = cat ill us Conrad). 



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

 and Du Page rivers (Ferriss) ; Illinois, Du Page, and Kankakee 

 rivers and Lilycash Creek, Will Co. (Handwerk) ; Kishwaukee, 

 Rock, and Pecatonica rivers (Hinkley ) ; La Salle Co. (Huett) ; 

 Mercer Co., Illinois River (Marsh) ; Fox River, Dundee, Kane 

 Co.; Algonquin, McHenry Co. (Nason); Mt. Carmel, Wabash 

 Co. (Nelson); Spoon River (Strode); Fulton Co. (Wolf). 



Quadrula solida Lea (= fulgidus Lea). 



Northern Illinois (Calkins); Illinois River (Calkins, Hand- 

 werk, Strode) ; Kankakee River (Ferriss, Handwerk, Marsh ) ; 

 Kishwaukee and Pecatonica rivers (Hinkley); La Salle Co. 

 (Huett); Mercer Co., Mississippi River (Marsh); Quincy, Ad- 

 ams Co. (Nason ) ; Spoon River (Strode); Fulton Co. (Wolf); 

 Milan, Rock Island Co. (State Laboratory). 



Quadrula plena Lea. 



Wabash River (Hinkley, Marsh). 



Quadrula pyramidata Lea. 



Little Wabash River ( Hinkley) ; Ohio River (Marsh) ; Athens, 

 Menard Co. (Nason ) ; Spoon and Illinois rivers (Strode) ; South- 

 ern Illinois (Ulffers). 



Quadrula subrotunda Lea. 



Illinois River (Call); Ohio River (Marsh). 



Quadrula ebena Lea. 



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

 Illinois (Calkins) ; Moline, Rock Island Co. (Call) ; Illinois Riv- 

 er, Utica, La Salle Co. (Ferriss, Handwerk); Shawneetown, 

 Gallatin Co. (Fischer); Quincy, Adams Co. (Hart, Nason): 

 Ohio, Wabash, and Little Wabash rivers (Hinkley); La Salle 

 Co. (Huett) ; Illinois and Spoon rivers (Kelly, Strode) ; Mercer 

 Co., Mississippi River (Marsh); Southern Illinois (Differs); 

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



Subgenus Rotundaria (Rafinesque) Simpson. 

 Quadrula tuberculata Rafinesque { — verrucosa Barnes). 



Savanna, Carroll Co. (Baker); Cook Co. (Baker, Calkins, 



