79 



Section Quadrula (Rafinesque) Agassiz. 

 Quadrula cylindrica Say. 



Shawneetown, Gallatin Co. (Fischer) ; Ohio River, Golconda, 

 Pope Co. (Hart); Wabash River (Hinkley); Little Vermilion 

 River (Marsh); Mt. Carmel, Wabash Co. (Nelson); Southern 

 Illinois (Ulff'ers). 



Quadrula metanevra Rafinesque. 



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

 Illinois River (Calkins, Handwerk, Kelly) ; Kankakee River 

 (Ferriss, Handwerk); Quincy, Adams Co. (Hart, Nason); Kas- 

 kaskia, Wabash, and Ohio rivers (Hinkley); La Salle Co. 

 (Huett); Mercer Co., Mississippi River (Marsh) ; Athens, Me- 

 nard Co. (Nason); Spoon River (Strode); Southern Illinois 

 (Ulti'ers); Fulton Co. (Wolf); Havana, Mason Co. (State Lab- 

 oratory). 



Quadrula metanevra wardii Lea. 



Illinois River (Handwerk, Marsh). 



Section Theliderma (Swainson) Simpson. 

 Quadrula lachrymosa Lea (= quadrula Say, asperimus Lea). 



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

 Kankakee River (Ferriss, Handwerk); Shawneetown, Gallatin 

 Co. (Fischer); Illinois River (Handwerk, Strode); Quincy, 

 Adams Co. (Hart, Nason) ; Kaskaskia, Big- Muddy, Little Wa- 

 bash, Ohio, and Pecatonica rivers (Hinkley) ; Spoon River 

 (Kelly, Strode) ; Mississippi River, Mercer Co. (Marsh) ; Athens, 

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

 (Wolf) ; Havana, Mason Co.; Peoria, Peoria Co. (State Labora- 

 tory). 



Quadrula lachrymosa lunulata Pratt. 

 Mississippi River (Marsh). 



Quadrula fragosa Conrad. 



Illinois River (Ferriss, Marsh); Kaskaskia River (Hinkley); 

 Athens, Menard Co. (Nason); Spoon River (Strode); Fulton 

 Co. (Wolf). 



Quadrula pustulosa Lea (= dor few 'Ilia no 'Lea, schooler aftensis Lea). 

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

 (Baker, Calkins, Jensen) ; Northern Illinois; Rock River (Calk- 

 ins) ; Kane Co. (Connor); La Salle Co. (Derr, Huett); Kan- 

 kakee River (Ferriss, Handwerk); Illinois River (Handwerk) ; 



