32 VIVIPARA. 



Length 31, diam. 19 mill. 



South Carolina. 



This is a very distinct species, and can 

 scarcely be confounded with any other. Its 

 conical form, flattened whorls, and revolving 

 angles, as well as its peculiar color, are its 

 most prominent characters. There is a re- 

 markable uniformity of appearance in the spe- 

 cimens that I have examined. 



21. VIVIPARA COARCTATA, Lea. 



Plate 15, fig. 1. , 

 Plate 13, fig. 7 ( Vivipara exilis, Anth.) 



Shell ovate, moderately thick, whorls 7, 

 convex, sutures well impressed, spire elevated, 

 narrow, aperture narrowly ovate, small, the 

 lip-extremities connected by a deposit on the 

 columella which nearly covers the umbilicus. 

 Surface marked by slight growth-lines, the 

 periphery sometimes very slightly angulated. 



Length 30, diam. 18 mill. 



Mississippi, Louisiana, Alabama ? 

 (58) 



