228 BOTHRIOPUPA. 



Key to Species. 



a. Parietal wall having an angular lamella joined to the 



parietal. B. geminidens, no. 1. 



a 1 . Parietal wall having a small angular lamella remote from 



the parietal. B. tenuidens, no. 2. 



a 2 . Parietal wall bearing a simple parietal lamella only. 



&. Without palatal plicae. B. leucodon, no. 6. 



ft 1 . One or two palatal plieas present. 



c. Four-toothed, having parietal and columellar 

 lamellae and two palatal plicae. 



d. Teeth large. B. tenuidens, no. 2. 



d 1 . Teeth small. B. breviconus, no. 3, 



c 1 . Three-toothed, no upper palatal plica present. 



d. Outlines of spire strongly convex; 



Florida. B. variolosa, no. 4. 



d 1 . Outlines less convex, spire more conic; 



Demerara to Venezuela. 



B. conoidea, no. 5. 



1. BOTHRIOPUPA GEMINIDENS n. sp. PL 28, figs. 12, 13, 14. 



The shell is oblong-conic, perforate and shortly rimate, 

 pale corneous, thin and fragile, composed of 414 whorls, 

 which are strongly convex. The surface is seen under the 

 microscope to be minutely granulose, and in life is daubed 

 with dirt (as in fig. 13). The aperture is squarish with the 

 angles rounded, slightly oblique. Peristome rather broadly 

 expanded on the columellar and basal margins, narrowly on 

 the outer margin. Angular lamella runs from the termina- 

 tion of the outer lip to the parietal lamella, joining the latter 

 near its anterior end. Parietal lamella higher than the an- 

 gular, somewhat curved (in a basal view, fig. 14). Columellar 

 lamella horizontally entering, from slightly to distinctly 

 leaning downward. The palatal plicae stand near the margin, 

 the lower being pliciform and larger than the upper, which is 

 tuberculiform. Length 1.5, diam. above aperture 0.95 mm. 



Venezuela: Cariaquita (S. Brown). Type and paratypes 

 105200 A. N. S. P. 



This species has a typically Gastrocoptid angulo-parietal 



