634 UNIO 
angle; beaks rather high, their sculpture not seen; posterior 
ridge well developed, subangular, ending below the median 
line in a point; surface nearly smooth; epidermis dark green 
or blackish with capillary rays, shining; posterior slope some- 
what wrinkled; pseudocardinals compressed, solid, single in 
the right valve and double in the left; laterals short, slightly 
curved; anterior muscle scars very deep; posterior scars well 
marked; nacre pink, iridescent. 
Length 57, height 30, diam. 22 mm. 
Type locality, small creek near Palatka, Florida. 
Umo ferrissi Marsyu, Naut., V. 1891, p. 30.—Simpson Pr. 
U.S. Nat. Mus., XV, 1892, p. 423, pl. LxvI, figs. 1, 2;—Syn., 
IQOO, p. 719. 
Allied to U. buckleyi and dorei, but I cannot unite it with 
either. Unlike U. buckleyi it has the posterior ridge strong 
and the dorsal slope wrinkled, and on the other hand it is 
much less inflated than U. dorei and is differently colored. It 
seems to be one of the nondescripts of the puzzling buckleyi 
group, which can neither be properly separated from other 
allied forms nor united with them. 
Unto borer B. H. Wright. 
Shell subrhomboid, the upper and lower outlines being some- 
what rounded, solid, inflated, inequilateral; beaks full and 
high, their sculpture not seen; posterior ridge high, angled 
above, slightly double below, ending in a feeble, narrow bian- 
gulation below the median line: dorsal slope obliquely trun- 
cated, meeting the dorsal line at an angle; anterior end sub- 
truncate, angled above: surface nearly smooth; epidermis red- 
dish-brown, ravless, shining; left valve with two compressed 
pseudocardinals and two curved laterals; right valve with two 
pseudocardinals, the upper smaller, and one lateral; muscle 
scars impressed, nacre brilliant salmon, iridescent behind. 
Length 66, height 41, diam. 29 mm. 
Type locality, Lake Monroe, Florida. 
Unio dorei B. H. Wricut, Pr. Ac. N. Sci. Phila., 1888, p. 115, 
Stmrsoan, Syn., 1900, p. 719. 
ploauetioeen 
