﻿126 LAMPSII.IS 



l)ase line curved, a little fuller behind the center of the shell ; 

 the posterior end drawn out into a rounded or slightly bian- 

 giilate point about midway up from the base ; gurface, when 

 in good condition, smooth and brilliant, tawny or pale greenish- 

 yellow, distinctly marked with usually broad, green rays ; left 

 valve with two small, low, slightly compressed pseudocardinals 

 and two short laterals ; right valve with two pseudocardinals, 

 the ui)per small and compressed, and one lateral ; beak cavities 

 not deep, but compressed ; muscle scars impressed, the anterior 

 separate; nacre bluish-white, lurid, pinkish-salmon or purplish, 

 but slightly thickened in front. The male and female shells 

 differ little, the latter is slightly more produced behind the cen- 

 ter of the base than the former. 



Length 57, height 33, diam. 20 mm. 



Appalachicola River system, Georgia and Florida. 



Type locality, Chattahoochee River, Columbus, Ga. 

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



Am. Phil. Soc, VIH, 1842, p. 29, pi. xui, fig. 23; Obs., IH, 



1842, p. 47, pi. XIII, fig. 23. — Chenu, 111. Oonch., 1858, pi. 



XXIX, figs. 2, 2a, 2b. — Kuster, Conch. Cab. Unio, 1862, p. 



278, pi. xciv, fig. 2.— Simpson, Pr. U. S. N. Mus., XVL 1892, 



p. 415, pi. LVIII, fig. I. 

 Margaron (Unio) srtbangiilatiis Lica, Syn., 1852, p. 29; 1870, 



P- 45- 

 Lmnpsilis siihangulatus Simpson, Syn., 1900, p. 556. 

 Unio fascioliis Conrad, Pr. Ac. N. Sci. Phila., VL 1853, p. 249. 



A brilliant and beautiful shell when in perfect condition. In 

 fine specimens the rays are broad and distinct ; there are some- 

 times intermediate narrow ones, and all are a rich green. Oc- 

 casional specimens are nearly or (juite rayless. 



IvAMPSir.is KiRKi.ANniANA ( S. II. Wright). 



Sheir elliptical or elliptic ovate, subsolid, subinflated, with 

 full, rather high beaks, whose sculpture in the only specimen 

 examined is eroded, with a high, but rounded, posterior ridge, 

 which ends in a decided, drawn-out, rounded point about mid- 

 \'riv up the hei'/ht of the shell; base line rounded, but slightly 



