﻿70 LAMPSILIS 



Countv, l'"l()ri(la, vvhicli aj^rcc fairly well with Conrad's descrip- 

 tion and figure of (Inio contrarius, and which I cannot satis- 

 factorily refer to any other species. 



Lami'Sii.is ci, AiiJORNENSis (Lca). 



Shell solid, elliptical, greatly inflated when old, beaks scarce- 

 ly elevated or inflated, their sculpture not seen ; surface slightly 

 concentrically sculptured but rather smooth, varying- from 

 greenish straw-color to tawny-brown, sometimes having a few 

 faint rays on the posterior slope; the rest of the shell is gen- 

 erally rayless ; lunule scarcely developed ; left valve with two 

 rather small pseudocardinals and two strong laterals, the low- 

 er the larger ; right valve with two pseudocardinals, the upper 

 the smaller and one strong lateral ; muscle scars well impressed ; 

 beak cavities moderately deep ; nacre bright silvery, sometimes 

 pink or salmon-tinted, a little thicker in front. Male shell 

 somewhat pointed behind about midway up from the base ; fe- 

 nxale shell but slightly produced in the post-basal region, gen- 

 erally nearly rounded behind. 



Length 70. height 45, diam. 35 mm. 



Length 70, height 50, diam. 42 mm. 



Gulf drainage of the United States, from the Flint to the 

 Pearl River. 



Type locality, Alabama River, Claiborne, Ala. 

 Unio claiborncnsis LivA, Tr. Am. Phil. Soc, VL 1838. p. 105, 



pi. XXIV, fig. 115; Obs., n, 1838, p. 105, pi. XXIV, fig. 115. — 



Troschki,, .Arch, fiir Naturg., V, 1839, pi. 11, p. 237. — Han- 



i,e;y, Biv. Shells, 1843, p. 192, pi. xxi, fig. 26. — Chenu, 111. 



Conch., 1858, pi. xxui, figs. 3, ^^a, 3^. — Sovvkrisv, Conch. 



Icon.. XVL 1868, pi. i.xx, fig. 357. 

 Margarita (Unio) claiborncnsis Liva, Syn., 1838, p. 19. 

 Margaron (Unio) claiborncnsis IvEA, Syn., 1852. p. 28; 1870, 



Lampsilis claiborncnsis Simpson. Syn., kjoo, p. 537. 



Unio obtusns Lea, Pr. Am. Phil. Soc, L 1840, p. 287 ; Tr. Am. 



Phil. Soc, Vin, 1843, P- 20T. pi. XI. fig. 13 ; Obs.. ITT. 1842, 



p. 39, pi. XI, fig. 13. — Chenu, 111. Conch. 1858. ])1. xxxi, figs. 



2, 2a, 2/7. — Reeve, Conch. Icon.. XXI. 1865, pi. xxvi, fig. 



129. 



