
5 
UNIO COMPLANATUS. 
Var. Subinflatus. 
Puate IX.—Fig, 2. 
DESCRIPTION. 
Shell elliptical, elongated, slightly ventricose over 
the umbo and umbonial slope, which is rounded; 
beaks obsolete; posterior extremity subangular; co- 
lour olive brown, with green rays; cardinal teeth ro- 
bust, sulcated; within purplish, and highly iridescent 
posteriorly. 
OBSERVATIONS. 
Inhabits Savannah and Congaree rivers, 8. Caro- 
lina. Distinguished from variety cariniferus, by the 
ventricose beaks and umbonial slope, and by the pos- 
terior dorsal margin, which is rounded at the extremi- 
ty in this variety, but angular in the cariniferus. 
MELANIA FORMOSA. 
Puate IX.—Fig. 3. 
DESCRIPTION. 
Shell with distant robust rounded ribs, and six 
convex whirls, with two approximate prominent 

