THE MOLLUSCA lOll 



149 (148) Shell oval to oblong; beak sculpture consisting of fine, doubly 

 looped ridges. Section Eurynia Rafinesque. 



This group has many species and is oE general distribution from Manitolja to Texas and 

 eastward. Type, Lampsilis rccla Lam. (Fig. 151,3; X i). 



Fig. isij. 



150 (147) Shell small, inflated, oval to obovatc; male usually more or less 

 pointed posteriorly; female truncated obliquely on the post- 

 base; beak sculpture consisting of rather strong concentric 

 ridges Subgenus Canmculina Simpson. 



A well-marked group of small, dark-colored species easily distinguished by the peculiar bealc 

 sculpture. Most of the species are confined to the Southern States from Georgia to Texas, but 

 two or three range north to Illinois and southern Michigan. Type, Lampsilis lexasensis Lea 

 (Fig. i5i4;Xi). 



Fig. 1514. 



