56() PROCEEDINGS OF THE NATIONAL MUSEUM. 



*Margaron ( Unio) cromivellii Lea, Syn., 1870, p. 49. 



t Unio marfjinis Lea', Pr. Ac. N. Sci. Phila.. 186.5, p. 89; * Jl. Ac. N. Sci. Phila.,VI, 



1869, p. 225, pi. XXXI, fig. 69; * Obs., XII, 1869, p. 15, pi. xxxi, fig. 69.—^ B. H. 



Wright, Check List, 1888. 

 *Margaron ( Un\o) marginis Lea. Syn., 1870, p. 49. 



Western Georgia and southeastern Alabama. 



t LAMPSILIS CORVUNCULUS Lea. 



*Unio corvuncidiis Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 144; *J1. Ac. N. Sci. 



Phila., VI, 1869, p. 314, pi. l, fig. 127 ; * Obs., XII, 1869, p. 74, pi. l, fig. 127.—* B. 



H. Wright, Check List. 1888. 

 "^Margaron ( Unio) corvunculus Lea, Syn., 1870, p. 49. 



Western Georgia; Village Creek, Jefferson County, Alabama; Lake 

 Ashby, Florida. 



t LAMPSILIS PAULUS Lea. 



*Unio paulus hTS.A, Pr. Am. Phil. Soc, 1840, p. 287; * Tr. Am. Phil. Soc, VIII, 

 1842, p. 213, pi. XV, fig. 29; * Obs., Ill, 1842, p. 51, pi. xv, fig. 29.—* Conrad, 

 Pr. Ac. N. Sci. Phila., VI, 1853, p. 254.— ''H. and A. Adams, Gen. Rec. Moll., II, 

 1857, p. 494.—* Che MI, 111. Conch., 1858, pi. xxvii, figs. .5, 5a, 5&.— * Kuster, 

 Conch. Cab. Unio, 1861, p. 260, pi. Lxxxvii, fig.6.— *B. H.Wright, Check 

 List, 1888.— * PiETEL, Conch. Sam., Ill, 1890, p. 162. 



""Margaron ( Unio) paulus Lea, Syn., 1852, p. 31; 1870, p. 49. 



t*C7)?io corvinus Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 144; * Jl. Ac. N. Sci. 

 Phila., VI, 1869, p. 310, pi. xlviii, fig. 123; Obs., XII, 1869, p. 70, pi. XLViii, 

 fig. 123.—" B. H.Wright, Check List, 1888. 



""Margaron ( Unio) corvinus Lea, Syn., 1870, p. 49. 



Flint and Chattahoochee rivers, Georgia. 



LAMPSILIS PULLUS Conrad.' 



*Unio pullus Conrad, Monog., XI, 1838, p. 100, pi. Liv, fig. 2; * Proc. Acad. Nat. 

 Sci. Phila., VI, 1853, p. 255.—* H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 

 494._* KusTER,Conch. Cab. Unio, 1862, p. 270, pi. xci, fig. 2.—* B. H.Wbight, 

 Check List, 1888.— * P.etel, Conch. Sam., Ill, 1890, p. 164. 



*Margaron ( Unio) pullus Lea, Syn., 1852, p. 31; 1870, p. 49. 



Warm Springs, Korth Carolina. 



Subgenus PEOPTERA Eafinesque, 1819. 



(Type, Unio alatus Say.) 



Shell usually large, gaping at the anterior base and edge of dorsal 

 slope, winged along the dorsal region when young and often when adult; 

 beak sculpture feeble, consisting, when developed, of an anterior and 

 posterior loop, the former often wanting; the latter sometimes becomes 

 slightly nodulous; epidermis generally brown, often cloth-like when 

 fresh, rayless or feebly rayed ; teeth rather compressed, pseudocardinals 



1 Conrad's figure is a poor one, and I can not be positive just where the species 

 should be placed, but incline to think it a member of the Texasensis group. Lea has 

 a shell which he calls the pullus of Conrad, which came from Ravenel, labeled "S. 

 Carolina," but which, I think, is not this, but some species of the subrostratua group. 

 It is quite probable that pullus is the same as Lea"s corvunculus. 



