African yoit-ninn'ne Mollit.sca. 1!)7 



remote from that of dissctniiiata in the extreme south-west 

 of Uj(au(l:i, ami hirger series may ultimately i)rovc the two 

 forms to be spcciticully distinct. 



Piipilla fontaua (Kriiuss) and Exnea iredalei, Preston. 



E. iredaU'i, of which I luive examined paratypes, appears 

 to have been founded on a large bleached example of 

 P.funtana. It represents almost the largest form of tlic 

 latter, and may l)e attributable to one of the so-called 

 "species" evolved therefrom by Bourguij;nat ; however, 

 nearly every variation of size and dentition may be met with 

 together in some parts of South Africa, and 1 agree with 

 Pilsbry (Manual, \\)2\) in placing all the North and South 

 African forms of thafontana group under one name. 



A smaller example of this species was collected by Percival 

 between the Laikipia Plateau and Eusso Nyiro. 



Section Paucidentixa, von Martens. 

 Gulella {Pancidentina) dupuisi, sp. n. (PI. XIV. fig. 39.) 



Shell of fair size, cylindric-ovate, rimate, thin, smooth, 

 glossy, transparent, pale olivaceous. Spire produced^ •!■ 

 apical whorls eonvcxly coniC; remainder nearly parallel, apex 

 rounded. ^Vhorls 7, rather convex, slowly increasing, smooth 

 except for extremely faint transverse stria?, which are only 

 visible with a strong lens just below the sutuie of the later 

 whorls, where they form a faint beading, and for a short 

 distance behind the outer lip ; suture filiform, not crennlate. 

 Aperture triangular, with equal sides and rounded angles ; 

 peristome white, very slightly thickened and expanded, 

 outer lip clearly angulate in profile, in contrast with the 

 nearly straight striation ; columellar margin stiongly inclined 

 to the left; rima dee|); callus none ; dentition consisting 

 of a short sharp denticle on the right centre of the paries; 

 a smaller one, without any external depression, at the angle 

 of the outer lip ; and a broad fiat plate, extending from the 

 left of the base along two-thirds of the inner columellar 

 margin, with a small swelling or tubeiclc at each end. 



Long. b'O, lat. a-y ; apert., alt. 2-2, hit. 18; last whorl 

 3*7 mm. 



Hab. Belgian Congo, Nsendwc {Vupuis). 



A considerable series of this species shows very little 

 variation ; the length ranges from 8*5 down to 7'1 mm. and 

 the dentition is practically constant except in one example. 



