470 l\Ii'. II. B. Preston on 



clescenfliiiQ", outwardly reflexed roiinrl tlie narrow perforation ; 

 aperture inversely auriform. 



Alt. 10, diam. maj. 5 mm. 



Aperture: alt. 5, diam. 2-5 mm. 



Hab. Between Rumruti and Mount Kenia, British East 

 Africa, 



Cerastus vohilis, sp. n. (Fig. 20.) 



Shell acuminately ovate, scarcely rimate, somewhat solid, 

 dark flesh-coloured, shading to a paler hue on the last whorl ; 

 whorls 6, raj)idly increasing, the apical wliorls smooth, 

 the remainder decussately sculptured with fine, spiral and 

 transverse stria3, the upper whorls also being rather coarsely 

 obliquely transversely striate, and the last coarsely malleated; 

 suture impressed, slightly creiiellate; columella rather verti- 

 cally descending, outwardly expanded above, a faint polished 

 callus joining it with the margin of the labrum ; labrutn 

 thickened, outwardly expanded, reflexed, tinged witli pale 

 reddish brown ; aperture inversel}^ auriform; interior of shell 

 rich reddish brown. 



Alt. 30, diam. maj. 21, diam. min. 17-5 mm. 



Aperture: alt. 13-5, diam. 8-5 mm. 



Hah. Mount Kenia, at an altitude of 6000-SOOO feet, 

 British East Africa. 



Jumi'nia desiderata, sp. n. (Fig. 21.) 



Shell small, turbinate, with very obtuse apex, reddish 

 brown ; whorls 5^, rather slowly increasing, moderately 

 convex, the last ascending in front; suture well impressed ; 

 umbilicus broad, somewhat deep, partly concealed by the 

 reflexion of the columellar margin; columella descending 

 very obliquely, bearing rather interiorly a single plait; 

 labrum whitish, sinuous, reflexed, projecting inwardly at a 

 point some little distance below its junction with the parietal 

 wall, which bears a weak, very oblique lamella; aperture 

 irregularly quadrate. 



Alt. 3, diam. maj. 2 mm. 



Aperture : alt. "75, diam. '5 mm. 



Hab. Mount Kenia, at an altitude of 9000-10,000 feet, 

 Briiish East Africa. 



Fauxuhis duplicatus, sp. n. (Fig. 22.) 



Shell small, sinistral, cylindrically ovate, rimate, brown ; 

 whorjs 5, the first four regularly increasing, the last ascending 



