UNIO 665 
inent, somewhat double, ending behind in a narrow faint bian- 
gulation at or below the median line; surface nearly smooth ; 
epidermis greenish-yellow to tawny or tawny-brown, usually 
showing dark rest marks, scarcely rayed, shining; pseudocar- 
dinals subcompressed to solid, rough; laterals long, curved; 
muscle scars large, impressed; nacre white, often silvery, a 
little thicker in front. 
Length 103, height 57, diam. 34 mm. 
Length 87, height 45, diam. 26 mm. 
North Carolina to Georgia. 
Type locality, Savannah River, Augusta, Ga. 
Unio icterinus Conrap, New F. W. Shells, 1834, p. 41, pl. v1, 
fig. 5; Monog., IV, 1836, p. 39, pl. xviul, fig. 2—CHENU, 
Bib. Conch., 1st ser., III, 1845, p. 20, pl. 1, fig. 5—S1IMPson, 
Syn., 1900, p. 727. 
Unio fuliginosus Lea, Pr. Am. Phil. Soc., V, 1845, p. 164; Tr. 
Mii, Pht 0G, <as.0 FOS nih, 705) PLavil, oS: 7193 .Obs:,. TV, 
1848, p. 52, pl. vu, fig. 19. 
Margaron (Unio) fuliginosus Lea, Syn., 18 
53: 
Unie cvratus es, Pre Ac) N: Scie Phila.,. VII, 1863, -p. 193; 
Peace Nese: iil Nek sEGOO, py 23. pl. Vil, fg. .21 > Obs:, 
MI 1867; p27, pl. :Vil, fis: 27. 
Margaron (Unio) curatus Lea, Syn., 1870, p. 46. 
Cen dats. bese rs Acs Ne pei. Philax; X11; 1868, p. 161; 
jhe Ac Ne sen Phila) VI._.1868, p: 200, pl. xinv,. fie. 3; Obs., 
MIE 1809, p50; ple xiv, fie. .3: 
Margaron (Unio) datus LeA, Syn., 1870, p. 45. 
Unio vatus Parer, Conch. Sam., III, 1890, p. 172. 
Unio cuspidatus Lea, Pr. Ac. N. Sci.- Phila., II, 1872, p. 159; 
eee Serer iva, Ne orem. 43. pl) xiv, fis. 40; 
Obs., XITI, 1874, p. 47, pl. xiv, fig. 40. 
Unio curcaius ex, Pr. Ac: N. Set, Phila., IJ, 1872, p. 159; 
fi Seo NS sce Phila, Vill tea, p38, pl. x11, fig. 35; 
Obs. XT, 16745 -p. 42, pl. xi he. 35. 
Unio subsquamosus Lea, Pr. Ac. N. Sci. Phila., II, 1872, p. 
iGo, fh AG oN. pcis Pilla Vy ile 7A, p: 47, pl. Xvi, fig.-455 
Obs., XIII, 1874, p. 51, pl. xvi, fig. 45. 
52, p. 33; 1670np- 
