16 PALUDINA GENICULA. 



elevated, diminishing rapidly: apex obtuse: lines 

 of growth fine and distinctly marked: surface 

 polished: aperture more than half the length of 

 the shell. The opercle has the lines of accre- 

 tion concentric. 



Color of the shell greenish; aperture bluish. 



OBSERVATIONS. 



A single shell of this species was found by 

 Mr. Conrad in Flint river, Georgia . This unique 

 specimen is now in the cabinet of Mr. Poulson. 



Reference to Plate 5. 



Figures 1 and 2 are views of the upper and lower sur- 

 faces of the shell, of which a represents the opercle. The 

 latter, it will be observed, had been broken, and was sub- 

 sequently repaired by the animal. 



