70 



PLEUROTOMARIA rotundata. 



TAB. DCXL.— Jig. 1 & 2. 



Spec. Char. Turbinate^ irregularly striated ; 

 whorls 4 or 5, regularly convex ; band rather 

 broadj flat, slightly elevated, placed above the 

 most prominent part of the whorl ; base con- 

 vex ; columella solid, cylindrical, accompanied 

 by a spiral ridge ; aperture nearly orbicular. 



JJiSTiNGUiSHED from Pleiirotomaria [Helix) carinata of 

 tab. 10. and fig. 3. of the present plate by its taller spire, 

 rounder whorls, and smoother surface (see letter a), but 

 more particularly by the solid columella and its accompany- 

 ing ridge ; the band also is less raised. Fig. 2. is from a 

 younger, smoother, less elevated specimen, but it bears the 

 characteristic ridge of the species. 



These specimens are I believe from Bolland; they are all 

 I have seen of the species. 



PLEUROTOMARIA carinata. 



TAB. DCXL.— /g-. 3. 



Spec Char. Turbinate, conical, short, neatly 

 striated all over in both directions ; whorls 5 

 or 6, less convex above the band which is 

 raised, convex and moderately broad ; base 

 convex, umbilicated ; aperture rather angular. 



