VIVIPARA. 27 



In 1863 Mr. Keeve refers the American form to Paludina 

 vivii^ai'a, Liu. 



Believing the species to be distinct from its European analogue, 

 and not finding the description of Valenciennes to apply to it, I 

 have been forced to adopt a new name, suggested by the resem- 

 blance of the shell to the F. contecta of Europe. 



Fig. 49. 



Fig. 50. 



Vivipara georgiana. 



Vivipara georgiana. 



Vivipara georgiana, Lea. — Shell scarcely rimate, elongately 

 ovate, ' ather thick, smooth, lines of growth delicate ; greeuish horn-<5olor, 



broken with darker longitudi- 

 nal streaks and a few black 



ones showing the former peri- 

 stomes, and whitish under the 



epidermis ; sometimes of a 



rich brown color, pinkish 



without the epidermis, and 



varied with four revolving 



darker bands upon the body 



whirl, two of which only are 



visible above, and numerous 



irregularly crowded, narrow 



lines of the same color ; spire 

 elevated, composed of one entire and one partially truncated whirl, apex 

 entirely removed ; remaining whirls 4^, regularly increasing, convex, the 

 last bulging, more than one-half the shell's length, rarely rimate ; aper- 

 ture subcircular, very oblique, more than half the length of the body 

 whirl, within uniformly white or dark horn-color, or plainly showing the 

 revolving bands, which do not reach the edge; peristome 

 edged with black, simple, acute, continuous, its columellar 

 margin asserted, somewhat reflexed, leaving a narrow 

 fissure, connected with the upper termination by a shining, 

 dark, raised callus. Length of axis 20, greatest breadth 

 of body whirl 21 ; length of aperture 15, breadth 14 mill. 



The operculum is thin, horny, brown, concentric with operculnmof 

 sub-central nucleus. V. georgiana. 



Fig. 51. 



