﻿LAMPSirjs 109 



Lampsilis vaughaniana (Lea). 



Shell subsolid, somewhat inflated, rounded and narrowed in 

 front, pointed behind; beaks not hig'h, their sculpture not seen; 1^ 

 surface with strong, irregular growth lines, dirty yellowish- 

 green or bottle-green with numerous feeble, wavy rays ; there 

 are two pseudocardinals in the right valve, the upper small 

 and compressed, and one lateral ; two rather stout, small, 

 erect pseudocardinals in the left valve and two laterals ; 

 beak cavities not deep, but compressed, with a few dorsal scars. 

 Anterior muscle scars separate, distinct ; posterior scars faint ; 

 nacre dirty white or straw-colored, iridescent behind, consider- 

 ably thickened in front. I have only seen two shells of this 

 species, both females. They are narrowed in front and pointed 

 about two-thirds of the way up behind and have a very full, 

 posterior, basal swelling. From this swelling to the posterior 

 point the outline is straight or slightly emarginate. 



Length 50, height 30, diam. 17 mm. 



Type locality, Sawney's Creek, near Camden, South Carolina. 

 Margarita (Unio) vaughanianus Lea, Syn., 1836, p. 39; 1838, 



P- ^S- 

 Unio z'aiighanianus Lea, Tr. Am. Phil. Soc, VI, 1838, p. 5, pi. 



Ill, fig. 5 ; Obs., IL 1838, p. 5, pi. Ill, fig. 5. — Hani^ey, Biv. 



Shells, 1843, p. 208, pi. XXII, fig. 48. — Chenu, 111. Conch., 



1858, pi. XXI, figs, iia, lib. 

 Margaron (Unio) vaughanianus Lea, Syn., 1852, p. 38; 1870, 



p. 61. 

 Lampsilis z'aughanianns Simpson, Syn., 1900, p. 550. 



Close to L. ogeccheensis Conrad, and may be only a solid, 

 dark, obscurely rayed variety of it. It is rather more inflated 

 than that species, and narrower in front. 



Lampsieis OGEECHEENSis (Conrad). 



Shell long elliptical or long obovate, rather thin, subinflated. 

 with low beaks that have slightly doubly-looped sculpture ; sur- 

 face with irregular growth lines, generally rather smooth and 

 shining, pale greenish-yellow with bright, narrow or wide, 



