BRACHYPODELLA, S. STR. 75 



Pfeiffer's description and one of his figures are given above 

 (fig. 14). Menke states that the ribs are lamellar, distant and 

 white. Paetel locates the species at Puerto Cabello, but I do 

 not know who identified his specimens. I have identified as 

 leucoplcnra a series of five shells collected by F. Cocking at 

 Caraccas, two of which are figured on pi. 15, figs. 9, 10, 14-16. 

 The shell is slender, 12.6 x 2 mm., narrowly truncate, with 

 14% whorls. The ribs are thin, somewhat lamellar, widely, 

 irregularly spaced, white or pale, and stand on a pale red- 

 brown ground. They become close on the neck, which has the 

 very strong, serrate basal keel and peripheral inflation com- 

 mon to the group. The whorls are less convex than in B. 

 trinitaria, and the peristome is thinner and narrower than in 

 B. morini, in which, moreover, the ribs are a little closer and 

 the last whorl tapers more downwards. The axis is markedly 

 sinuous. This form, whether it be the true leucopleura or 

 not, is apparently distinct from B. hanleyana by its more 

 slender figure and wide-spaced riblets. 



27. B. TRINITARIA (Pfeiffer). PI. 5, figs. 37, 38, 39. 



Shell cylindric below, the upper half regularly tapering to 

 a narrow truncation or entire apex; thin, brownish corneous. 

 Surface hardly glossy, sculptured with oblique, wide-spaced, 

 pale riblets, the intervals three or four times their width. 

 Whorls very numerous and very convex, the last strongly 

 keeled below, projecting in a descending neck, which bulges 

 conspicuously at the periphery. Aperture slightly oblique, 

 tetragonal-rounded, angular at the outer and basal margins; 

 peristome broadly expanded, the upper and columellar mar- 

 gins white and reflexed, basal and outer margins brownish. 

 Axis very slender, encircled by a small, thin, spiral lamella. 



Length 9.3, diam. 2 mm., whorls 12 remaining. 



Length 13, diam. 2.1 mm., whorls 15 remaining. 



Length 14-15.5, diam. 2.5 mm., whorls 16-17 remaining 

 (Pfr., types). 



Length 16.5, diam. 2.1 mm., whorls 21 remaining. 



Length 17.5, diam. 2.2 mm., whorls 24i/ 2 (entire). 



Trinidad : northern portion, Laventille Hills, near Port-of- 

 Spain, on the sides of limestone rocks (Guppy). 



