VIVIPARA. . 25 
12. VIVIPARA .NOLANI, Tryon. 
Plate 12, figs. 10, 11. 
Ovate, imperforate, thick, spire short conic 
or truncated; whorls 5, separated’ by a very 
deep suture making a rounded shoulder on 
each, aperture subpyriform, the inner lip very 
thick. Dark olivaceous, bluish or white 
within. 
Length 33, diam. 24 mill. 
Coosa River, Alabama. 
Hitherto confounded with V. ponderosa, 
this species is readily distinguished in all 
stages of growth by its narrower and more 
sloping whorls and deep sutures. 
13. VIVIPARA OBESA, Lewis. 
Plate 13, fig. 6. 
Obesely-ovate, very ventricose; whorls 5, 
convex, spire short-conic, sutures well im- 
pressed, aperture ovate. Dark olivaceous, 
bluish-white within the aperture. 
(1) 
