30 VIVIPAKA. 



thickened above. Green, white or bluish 

 within. 



Length 17, diam. 14 mill. 



Alabama, Tennessee. 



This shell does not appear to resemble 

 closely any of the other species, although it 

 might perhaps be a much eroded decisa. It is 

 certainly not referable to the genus Lithasia, 

 as Mr. W. G. Binney has supposed. The V. de- 

 cajntata, Anth., appears to be tlie same species. 



19. VIVIPARA DECAMPI, Currier. 



Plate 14, figs. 1, 2. 



Shell ovate-oblong, imperforate, thick, with 

 coarse wrinkles and longitudinal striae, decus- 

 sated by delicate revolving striae; spire 

 elevated, truncated ; remaining whorls three, 

 those of the spire somewhat flattened, the last 

 more convex, with a scarcely perceptible me- 

 dian angle. Aperture ovate, narrow. Green- 

 ish olive, with dark broad bands when young, 

 uniformly dark olive when old, bluish within. 

 (56) 



