﻿LAMPSILIS 51 



with generally a faint ridge above it ; beak sculpture consisting 

 of strong, nearly straight bars ; epidermis slightly concentric- 

 ally wrinkled, yellowish-green to reddish-ash with numerous 

 wide or narrow, faint green rays, scarcely shining. The old 

 shells are sometimes dark brownish and apparently rayless. 

 Female shell with a rather strong marsupial swelling, the male 

 is often a little swollen behind the middle of the base ; left 

 valve with two rather small, usually subcompressed, pseudo- 

 cardinals, the posterior at some little distance in front of the 

 beak, and two remote laterals, the lower the larger ; hinge line 

 greatly narrowed and rounded under the beaks; right valve 

 with iwo pseudocardinals, the upper narrow and small, the 

 one lateral truncate behind. Beak cavities deep and wide ; pos- 

 terior muscle scars shallow, semicircular ; nacre pale lurid vio- 

 let, sometimes bluish. 



Length (male) 95, height 52, diam. 45 mm. 



Length (female) 95, height 63, diam. 45 mm.. 



Altamaha and Ogeechee Rivers, Georgia. 



Type locality, Altamaha River, Darien, Ga. 

 Unio splendidiis Lka, Tr. Am. Phil. Soc, VL 1838, p. 70, pi. 



XIX, fig. 61 ; Obs., n, 1838, p. 70, pi. XIX, fig. 61. — KusTF.k, 



Conch. Cab. Unio, 1852, p. 55, pi. xii, fig. 2. — Chenu, 111. 



Conch., 1858, pi. XVII, iigs. 7, ya, 7&.— Sowerby, Conch. 



Icon., XVT, 1866, pi. XXXI, fig. 161. 

 Margarita (Unio) splendidiis Lea, Syn., 1836, p. 23; 1838, 



p. 18. 

 Margaron (Unio) splendidus Lea, Syn., 1852, p. 27 ; 1870, 



p. 42. 

 Lampsilis splendidus Simpson, Syn., 1900, p. 531. 

 Unio rcgularis Sowerby, Conch. Icon., XVI, 1868, pi. xxxiv, 



fig. 181. 



A sornewhat peculiar and rather variable species. The fe- 

 male shell is higher than that of the male, and more blunt 

 behind. It is probably most nearly related to L. ochracca Say, 

 btit does not approach very nearly to anything. 



