84 



OBSERVATIONS. 



Inhabits the Ohio, Scioto, Wabash, and more 

 rarely the rivers of Tennessee. I have not observed 

 it so far south as the Tennessee river, in Alabama. 

 It is a very beautiful species, remarkable for its very 

 numerous dotted rays and its regular and graceful 

 outline, which approaches that of U. retusus. 



UNIO DROMAS. 



Plate XLVL Fig. 2. 

 DESCRIPTION. 



Shell obliquely ovate; disks flattened above, and 

 with a very prominent concentric angular ridge in 

 the middle; a slight furrow from beak to base on the 

 posterior side; beaks prominent, summit rather wide, 

 flattened; lunule angular; epidermis yellowish-brown, 

 with very numerous green interrupted capillary rays, 

 and a few broad rays; within white; cavity shallow. 



SYNONYME. 



U. dromas, Lea. Trans. Amer. Phil. Soc, new series, vol. v. 



p. 182, pi. x. fig. 29. 

 Cab. A.N S., No. 20416. 



OBSERVATIONS. 



Inhabits Harpeth and Cumberland rivers, Tennes- 

 see; Elk river, near the muscle shoals, Alabama. I 

 have not found it further south. 



My father, many years since, received this elegant 



