48 



tluced; 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. 



Plate VIII.— F^^g". 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 is readily distinguished from those 

 nearest allied to it by the angulated whorls. I found 

 a single specimen in Flint river, Georgia. 



PALUDINA MAGNIFICA. 



Plate YlU.—Fig. 4. 



DESCRIPTION. 



Shell obovate, ventricose, with two spiral bands of 



