UNIO 683 
nacre is purplish in front and green iridescent behind. Dr. Lea 
has placed larger specimens with this from the Little Uchee 
River, Alabama, that seems to be different. 
Unio stncuLaris B. H. Wright. 
Shell rather elongated. subrhomboid or subelliptical, some- 
what inflated, a little narrower and rounded in front; inequi- 
lateral: base line straight or slightly incurved in the middle, 
full behind the middle; posterior ridge full, double, ending be- 
hind in a wide, square biangulation ; surface rough, with strong 
growth lines; epidermis olive in young shells, reddish-brown 
in adult specimens; pseudocardinals stumpy, ragged; laterals 
straight; anterior scars impressed; posterior scars shallow; 
nacre coppery or purplish. 
Length 66, height 33, diam. 22 mm. 
Type locality, Spring Creek, Decatur County, Georgia. 
Unio singularis B. H. Wricut, Naut., XIII, 1899, p. 75. 
The above was accidentally omitted from the Synopsis. It 
is something like U/. strigosus, but is much more inflated. I 
am doubtful as to its validity, but hardly feel like uniting it 
with anything else. 
Unio LAZARUS Lea. 
Shell elongated, decidedly arcuate, compressed, subsolid, 
inequilateral ; beaks slightly elevated, their sculpture consisting 
of strong ridges, which follow the growth lines; posterior 
ridge low, rounded or faintly biangulate ; dorsal ‘slope oblique- 
ly subtruncated; posterior end rounded or feebly biangulate ; 
surface covered with irregular growth lines; epidermis green- 
ish and shining in young shells, dark burnt-brown and rough 
in old ones; pseudocardinals imperfectly developed; laterals 
short, remote, not strong: anterior scars rough; posterior 
scars faint: nacre purplish in young shells, almost chocolate- 
colored in old specimens. 
Length 53, height 22, diam. 11 mm. 
Type locality, Abbeville district, South Carolina. 
