African yoti-marine Mollusca. ')(>.'5 



Strepiostelefalluoni, .sp. n. (IM. XIV. iv^. 3.) 



Shell of moderate size, siil)fusil"onii, riniate, tliiii, silky, 

 translucent, pale milky olivaceous. Spire produced, sides 

 coJiic until tlu; (Uli wliorl, thence almost parallel to the base ; 

 «pex acute. Whorls 1), rather Hat, the first -I increasin<^ 

 very slowly in length and breadth, the next two much more 

 rapidly, thus imparting to the sj)ire its irregular appearance, 

 the last 3 about equal in size ; the first 2^ microscopically 

 punctatel}' malleate, remainder scul|)tured with extremely 

 faint, close, regular, nearly straight, slightly oblique, trans- 

 verse striie, which are chiefly visible in the sutures and 

 become further apart on each succeeding whorl ; suture 

 nearly horizontal, ercnulate, well defined. Aperture sub- 

 rhombic, flattened at base ; peristome thickened, infinitesi- 

 mal ly reflexed ; outer lip hardly curved outward, sharply 

 angulate forward in profile and then receding to the base ; 

 columella nearly straight and vertical, margin thickened 

 and rellexed, so as to form a clear rima; callus very 

 pronounced, with a small, inset, mid-parietal tubercle or 

 fold, which recedes about '5 mm. within the shell. 



Long. 8 1, lat. 2*5; apert., alt. 2-1, hit. 1-2; last whorl 

 3*5 mm. 



Hab. Kexya, Near Nairobi {Rev. W. M. Falloon). ]Mau 

 Escarpment (Doherlij) . 



A remarkable shell, entirely distinct in its combination of 

 shape and dentition from others of the genus. 



Slreploslt/e /cciiijana, sp. n. (PI. XIV. fig. 4.) 



Shell comparatively large, aeicular, rimate, thin, smooth, 

 rather glossy, somewhat bleached in the ty])e, but normally 

 nearly transpjirent and pale olivaceous. S[nre produced, 

 sides nearly regular, apex acute. Whorls 9, almost Hat, 

 regularly increasing, the first 3 densely, but most faintly, 

 niicroscopically punctate, remainder scul[)tured with very 

 close and faint, nearly straight and vertical striio, strongest 

 just below the suture, which is only moderately oblique, 

 simple and shallow. Aperture acuminate-ovate, rounded at 

 base; peristome thickened, very slightly reflexed; outer lip 

 a little curved outward, slightly angulate forward in profile 

 and then receding equally slightly to the base ; columella 

 concave, margin thickened and triangularly reflexed, forming 

 a small rima; callus and dentition none. 



Long. 10-4-, lat. 2-9 ; apert., alt. 2-0, lat. 1-2; last whorl 

 4'U mm. 



34* 



