﻿I02 I^AMPSILIS 



to say just what tliis is, as it lias the dull, dark color of lienosa 

 but something" of the form of concestator and it may be a 

 variety of tlie latter. 



Type locality, Sprinj; Creek, Decatur Co., Ga. 

 Uiiio iiiiicostatiis P>. H. Wright, Naut. XIII, 1899, p. 69. 

 LcDHpsHis lioiosns var. unicostatns vSimpson, Syn., 1900, p. 



547- 



La.mi'Siijs concestator (Lea). 



Shell elliptical or irregularly obovate, subinflated, subsolid, 

 the beaks moderately full with a few doubly-looped ridges ; the 

 growth lines irregular ; surface varying from yellowish or dirty 

 tawny to blackish, generally having a few faint rays behind 

 and somewhat shining; teeth granular; there are two subconi- 

 pressed pseudocardinals in the left valve and one and a vestige 

 of another in the right ; two lamellar laterals in the left valve 

 and one in the right ; muscle scars shallow ; nacre whitish-flesh 

 or straw-colored, salmon or deep purple, not much thickened 

 in front. The male shell is nearly evenly elliptical or slightly 

 obovate, the female shell is narrowed in front and greatly pro- 

 duced at the post-basal region, it ends behind in an elevated 

 and much shari)er point than that of the male. 



Length (male) 60, height 38, diam. 25 mm. 



Length ( female) 55, height 38, diam. 26 mm. 



North Carolina, in streams flowing into the sea, to Louis- 

 iana, and possibly to Texas. 



Type locality, creeks, Columbus, Ga. 

 Unio concestator Lea, Pr. Ac. N. Sci. Phila., IX, 1857, p. 31 ; 



Jl. Ac. N. Sci. Phila., IV, 1858, p. 66, pi. xii, fig. 48 ; Obs., 



VI, 1858, p. 66, pi. XII, fig. 48. — KuSTER, Conch. Cab. Unio, 



t86i, p. 178, pi. i.vi, fig. 3.— Reeve, Conch. Icon., XVI, 1865, 



pi. XXVI, fig. 128.— Simpson, Pr. U. S. Nat. Mus., XVI, 



1892, p. 416, pi. LVIII, figs. 2-4. 

 Margaron (Unio) concestator Lea, Syn.. 1870, p. 45. 

 Lampsilis concestator Simpson, Syn., i(X>o, p. 548. 



