﻿LAMPSII.IS lOl 



ture not seen : surface with irregular growth Hnes, often more 

 or less sulcate, varying from dirty tawny to black, often faint- 

 ly rayed behind ; left valve with two granularly roughened 

 pseudocardinals and two curved laterals ; right valve with one 

 pseudocardinal, a feeble lamellar tooth above, and one lateral 

 with a vestige of another below it in old shells ; laterals gran- 

 ular ; muscle scars small, well impressed ; nacre white, salmon 

 or tlesh-colored. sometimes deep purple, slightly thicker in 

 front. The male is often nearly rounded or sub-biangular be- 

 hind, the posterior end at or above the middle of the height ; 

 the female shell is considerably swollen at the posterior base, 

 and its posterior end is more elevated than that of the male. 



Length 70, height 43, diam. 30 mm. 



Lower Mississippi River drainage north to the lower Ohio 

 and Wabash ; east to southwest Georgia. 



Type locality, small streams in southern Alabama. 

 Unio lienosns Conrad, Am. Jl. Sci., XXV, 1834, p. 339, pi. i, 



fig. 4 ; Monog., VII, 1836, p. 60, pi. xxxiv, fig. 2. — Hanle:y. 



Biv. Shells, 1843, P- I94» pl- ^^i, iig. 32. — Kuster, Conch. 



Cab. Unio, 1852, p. 67, pi. xvi, fig. 3. — Sowerby, Conch. 



Icon., XVI, 1866, pi. XXXII, fig. 166; 1868, pi. lxxv, iig. 388. 

 Margarita (Unio) lienosns Lea, Syn., 1836, p. 26; 1838, p. 20. 

 Margaron (Unio) lienosus Lea, Syn., 1852, p. 29; 1870, p. 45. 

 I.ampsilis lienosus Simpson, Syn., 1900, p. 547. 

 Unio saxciis Conrad, Monog., XII, 1840, p. 109, pi. ix, fig. i. 

 Margaron (Unio) saxeiis Lea, Syn., 1852, p 27; 1870, p. 42. 

 Unio caliginosns Lea, Pr. Am. Phil. Soc, IV, 1845, P- 165 ; Tr. 



Am. Phil. Soc, X, 1848, p. 79, pi. vii, fig. 21 ; Obs., IV, 1848, 



P- 53' P''- vii, fig. 21. — KusTER, Conch. Cab. Unio, 1861, p. 



180, pi. EVI, fig. 7. 

 Margaron (Unio) caliginosns Lea, Syn.. 1852, p. 29; 1870, p. 



45- 

 Unio fontaniis Conrad, Am. Jl. Sci., II, 1866. p. 279, pi. xv, 



%• 13- 



Var. unicostata (B. H. Wright). 



Shell smaller than typical lienosa and having in some cases a 

 faint radial ridge running down the posterior slope. It is hard 



