48 
duced; margin oblique and rectilinear; truncated at 
the extremity; basal margin hardly arcuated. 
* 
OBSERVATIONS. 
This shell attains a length of four or more inches, 
and is distinguished by its subcylindrical form. I 
found it in the Santee canal, South Carolina. 
PALUDINA GENICULA. 
Pare VIIL—Fig. 3. 
DESCRIPTION. 
Shell suboval; spire slightly elevated; volutions 4, 
scalariform; shoulders angulated; apex eroded; 
aperture rather more than half the length of the 
shell; epidermis green olive; within bluish. 
‘OBSERVATIONS. 
A species which isreadily distinguished from those 
nearest allied to it by the angulated whorls. I found 
a single specimen in Flint river, Georgia. 
PALUDINA MAGNIFICA. 
Pirate VIII.—Fig. 4. 
DESCRIPTION. 
Shell obovate, ventricose, with two spiral bands of 

