36 



MEMOIRS OF THE CARNEGIE MUSEUM. 



Elk liiver, Shcltoii, Clay Co., West Virginia. 



Pocatalico River, Raymond City, Putnam Co., West Virginia. 



Little Coal River, Boone Co., West Virginia (Hartman collection) .^^ 



Lcvisa Fork Big Sandy River, Prestonsburg, Floyd Co., Kentucky. 



Liclung River, Farmer, Rowan Co., Kentucky. 



Wabash River, New Harmony, Posey Co., Indiana (A. A. Hinkley). 



Mississippi River, Muscatine, Muscatine Co., Iowa (Hartman collection); and Moline, Rock Island Co., 



Illinois (P. E. Noordgren).'" 



Tennessee-drainage : 

 Tennessee River, Florence, Lauderdale Co., and Tuscumbia, Colbert Co. (H. H. Smith); Bear Creek, 



Burleson, Franklin Co. (H. H. Smith); Shoals Creek, Lauderdale Co. (H. H. Smith); Paint Rock 



River, Paint Rock, Jackson Co., Alabama (H. H. Smith). 

 Tennessee River, Concord and Knoxville, Knox Co., Tennessee. 

 French Broad River, Boyd Creek, Sevier Co., Tennessee. 

 Nolichucky River, Chunns Shoals, Hamblen Co., Tennessee. 



Holston River, McMillan and Mascot, Knox Co.; Hodges, Jefferson Co., Tennessee. 

 Clinch River, Solway, Knox Co.; Edgemoor, Clinton, and Offutt, Anderson Co., Tennessee. 



Specimens from the Black River and Ouachita River in Arkansas do not represent the typical 

 phase of Q. jntstulosa: they require further study. (See: Wheeler, 191S, p. 12.3.) 



Fig. 5. 



■ Quadrula pustidosa. 

 A Quadrida pustulosa schooler aflensis. 

 • Quadrula quadrula. 

 + Quadrula verrucosa. 



" Labeled " Little Coal River, Logan Co., Virginia," but this river does not flow through Logan Co. 



'" The specimens from the Mississippi River differ somewhat from the typical form in having a 

 better developed posterior wing and somewhat more prominent beaks, so as to intergrade toward Q. 

 dorfeuillana (Lea). 



