36 LIOPLAX. 
4, LIOPLAX COOSAENSIS, Lea. 
Plate 15, figure 2. 
Shell subglobose, turbiform, smooth, whorls 
five, very convex, spire short, sutures deeply 
impressed, aperture moderate, nearly round, 
narrowly umbilicated. Very pale green, 
whitish within. 
Length 16, diam. 15 mill. 
Coosa River, Alabama. 
The form of this species is remarkably dis- 
tinct from that of either of its congeners. It | 
is rare, for no specimens have been obtained 
since the original lot, over twenty-five years 
ago. The top of the whorls is almost tabular, 
and it is somewhat doubtful whether the spe- 
cies is not distorted from its normal growth 
and forcibly compressed in its axis. Thus, it 
might in such case even prove to be identical 
with one of the two species immediately pre- 
ceding this. In this case, as in many others, 
conchology needs more light! Who will illu- 
minate ? 
(62) 
