﻿LAMPSir.is 145 



female shell, which is rounded behind and has a small, mar- 

 supial swelling placed well back. The writer found a dead 

 shell at Columbus, Georgia, in the Chattahoochee River, which 

 seems to be a male of this species. It is a little longer in pro- 

 portion than the figure, and is bluntly pointed behind about 

 midway up from the base. 



Length (male) 36, height 21, diam. 13 mm. 



Length (female) 33, height 20, diam. 12 mm. 



Flint and Chattahoochee Rivers, Georgia. 



Type locality, Chattahoochee River, Ga. 

 Unio pellncidus Lra, Pr. Am. Phil. Soc, IV, 1845, p. 163; Tr. 



Am. Phil. Soc, X, 1845, P- 70. Pl- ". %• 6; Obs., IV, 1848, 



p. 44, pi. II, fig. 6. 

 Margaron (Unio) pellucidus Lea, Syn., 1852, p. 39; 1870, p. 



62. 

 Lampsilis pellncidus Simpson, Syn., 1900, p. 562. 



The type is not in Lea's collection, but belonged to Major Le 

 Conte. It is a remarkably thin shell, of a peculiar, smoky- 

 brown color, rather dark, with numerous darker, wavy, faint 

 rays. In the shell found by the writer the nacre has been 

 somewhat weathered and has turned dark, but in places where 

 it is perfect it is brilliantly iridescent. 



Lampsilis minor (Lea). 



Shell small, subsolid to solid, obovate, inflated, its greatest 

 diameter just behind the beaks, from which point to the pos- 

 terior end it is wedge-shaped ; posterior ridge wanting ; beaks 

 full, but not high, their sculpture not seen; epidermis black, 

 thick, and cloth-like, rayless ; left valve with two rather ragged, 

 solid pseudocardinals, the hinder the larger and higher; they 

 are often united by a ridge on their upper side, and have a pit 

 between them, and two small laterals; right valve with one 

 strong pseudocardinal and one lateral. There is sometimes an 

 extra, small, anterior pseudocardinal in each valve; anterior 

 scars deep; posterior scars well marked; nacre bluish-white, 

 sometimes a little lurid in the center, brilliantly iridescent be- 



