﻿1 in I.AMPSILIS 



l)rokcn, i:;:rccn rays, often so disposed as to have concentric 

 bands of the ground color ; pseudocardinals compressed, two 

 in each valve ; two delicate laterals in the left valve and one in 

 the rij^^ht ; beak cavities quite shallow ; anterior scars not im- 

 pressed : posterior scars very faint ; nacre dirty pinkish or 

 bluish with a purplish center, not thickened in front. The fe- 

 male shell is shorter and hi.si'her than the male ; it has a much- 

 produced marsupial swcllinc: and a blunt posterior point two- 

 thirds of the way up from the base, the outline between these 

 two points is straic^ht or faintly emarpnate ; the male shell is 

 pointed behind about midway up from the base. 



Lengfth (male) 57, heig'ht 32, diam. 20 mm. 



Length (female) 53, height 36, diam. 23 mm. 



Neuse River, North Carolina ; south to north Florida ; west 

 to the Etowah River. Georgia ; Duck River. Tennessee. 



Type locality, Ogeechee River, Ga. 

 Unio o^eecheensis Conrad, Ann. and Mag., N. Hist., IV, 1849. 



p. 300; Jl. Ac. N. Sci. Ph.ila., T, T850, p. 275, pi. xxxvii, figs, 



3- 4- 

 I.anipsilis o^eecheensis Simpson, Syn., iqoo. p. 550. 

 Unio prevostianits Lka, Tr. Am. Phil. Soc. X. 1852. p. 269. 



pi. XIX, fig.. 24; Obs., V, 1852. p. 25, pi. XIX. fig. 24. — Mus- 



GRAVE. Phot. Conch.. 1863, pi. it, fig. to. 

 Margaron (Unio) pm'ostianns Lt;a, Syn., 1852, p. 29; 1870, 



p. 44. 

 Unio proximus Lea, Pr. Am. Phil Soc, \\ 1852, p. 252 ; Tr. 



Am. Phil. Soc, X, 1852, p. 271, pi. xx. fig. 2y : Obs., V, 1852. 



p. 27, pi. XX, fig. 2y. 

 Margaron (Unio) proximus Lea, Syn., 1852, ]). 29: 1870, p. 



45- 

 Unio tencrus Simpson, Pr. U. S. Nat. "Mus.. X\'. 1892. p. 416,. 



pi. LVTTT. figs. 5, 8. 



A species, which has something of the texture and coloring 

 of members of the iris group, but the form of the shell is dis- 

 tinctly that of the subrostrata group. It seems to be distributed 

 in the Atlantic, the Gulf and Mississippi drainage areas. 



