VIVIPARA. 



31 



Length 35, diam. 22 mill. 



Alabama. 



Mr. Binney remarks tliat (Monog., p. 115) 

 " All but the one drawn in Fig. 227 (my fig. 

 1) could not be distinguished from Melania 

 without the presence of the operculum, thus 

 furnishing another example of the impossibihty 

 of ascertaining from the shell alone the gene- 

 ric position of some species." I examined the 

 specimens, and could not see any resemblance 

 to Melania. I think their appearance deci- 

 dedly Viviparish. 



20. VIVIPARA LIMA, Antliony. 



Plate 13, figs. 8, 9, 10. 



Shell ovate, rather thin, dark green, whorls 

 6, flattened, angulate at the middle and bear- 

 ing coarse irregular, distant, revolving striae 

 and angles, sutures distinctly impressed, aper- 

 ture narrow, nearly half the entire length of 

 the shell, umbilicus generally covered. Light 

 olive colored, bluish within. 

 (57) 



