682 UNIO 
epidermis tawny or reddish-brown, with a slight bronzy hue, 
shining ; pseudocardinals stumpy, double in each valve; right 
valve with one curved lateral ; left valve with two; muscle scars 
distinct ; nacre salmon or coppery-tinted, thicker in front. 
Length 45, height 23, diam. 14 mm. 
Type locality, Mountain stream, North Carolina. 
Umo spadiceus Ura, Pro Ac. N. Ser Phila, 10857, p60, 
AceNy Sear Phila V >) 1862, 94.55, plat: te. 201 Ops nr 
1862, p. 12, pl. 1, fig. 201.—SIMPSON, Syn., 1900, p. 732. 
Margaron (Unio) spadiceus Lea, Syn., 1870, p. 48. 
A small form, the tvpe of which seems to be adult. It has 
a rather solid shell, slightly produced on the base behind the 
middle, with a half metallic, tawny-brown or reddish-brown, 
shining epidermis and salmon nacre. 
UnIo stricosus Lea. 
Shell elongated, somewhat arcuate, compressed, solid, in- 
equilateral ; basal and dorsal lines nearly parallel; anterior end 
rounded ; posterior end feebly subtruncated above, almost even- 
ly rounded below ; posterior ridge widely rounded, showing the 
faintest trace of biangulation; beaks evidently not raised or 
full; surface with delicate but well-marked growth lines; epi- 
dermis greenish and shining on the disk, darker and duller 
on the border of the shell; pseudocardinals feebly developed, 
low, two in the left valve and one in the right ; laterals remote, 
not strong; muscle scars well marked; nacre dull purplish- 
greenish, iridescent behind, thicker in front. 
Length 55, height 24, diam. 13 mm. 
Type locality. Chattahoochee River, Columbus, Georgia. 
Also Southeast Alabama ? 
Unio strigosus Lea, Pr. Am. Phil. Soc., 1, 1840, p. 287; Tr- 
Am: Phil Soe! VIL, 1843; -p. 168 pl. este on Ober: 
1842, p. 36, pl. rx, fig. 9 —CHENU, Ill. Conch., 1858, pl. xxx, 
figs. 6, 6a, 6b.—Srtmpson, Syn., 1900, p. 732. 
Margaron (Unica) strigosus Les, Syn., 1852, p. 36; 1870, p. 57. 
A curious form, approaching U. lazarus, but more solid 
and smoother. Its teeth are but imperfectly developed; the 
