4Gt 



Mr. n. B. Preston on 



with rather coarse, very oblique, transverse strife ; suture 

 somewhat deeply impressed; labruni sinuous, white, scarcely 

 reflexed, the margins not joined, though it is continued for 

 some distance along the parietal wall ; aperture almost irre- 

 gularly triangular, furnished with two oblique parietal 

 lamellae, of which the lower is the coarser, a short lamella on 

 the outer lip, a coarse basal denticle, and a coarse oblique 

 lamella on the columella. 



Alt. 1-5, diam. maj. 1 mm. 



Hab. Between Rumruti and Mount Kenia, British East 

 Africa. 



Ennea keniana, sp. n. (Fig. 3.) 



Shell small, ovately cylindrical, white, somewhat polished ; 

 whorls 8, the first five rather rapidly increasing, sculptured 

 with obsolete, oblique, transverse striae, which become more 

 accentuated on the last whorl behind the labrum, the last 

 whorl tri-strangulate j suture impressed ; umbilical area exca- 

 vated, depressed, and finally narrowing to a shallow chink ; 

 labrum white, continuous ; columella descending rather 

 obliquely ; aperture irregularly rectangular, armed with an 

 almost vertical paiietal plait, which bifurcates above where 

 it reaches the margin of the peristome, a denticle and below 

 this a lamella on the outer lip, a rather coarse basal erect 

 lamella and an inwardly curved lamella on the columella. 



Alt. 3"5, diam. maj. 1'5 mm. 



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



Ilab. Mount Kenia, at an altitude of 6000-8000 feet, 

 British East Africa ; a single specimen was also taken in the 

 lower country between Rumruti and Mount Kenia. 



Ennea optata, sp. n. (Fig. 4.) 



Shell cylindrically ovate, moderately solid, whitish, polished, 

 shining ; whorls 7^, flat, the earlier whorls rather rapidly 

 increasing, the later very slowly increasing, marked with 

 transverse arcuate strios, which become finer on the later 

 whorls, and very fine wavy spiral striae^ the last whorl bi- 

 strangulate behind the labrum; suture linear; umbilical 

 area shallowly excavated, but without regular perforation ; 

 labrum white, thickened, reflexed ; aperture irregularly sub- 

 quadrate, armed with a rather crookedly curved parietal 

 lamella on the right side, a somewhat coarse lamella situate 

 between two denticles on the inner margin of the outer lip, a 

 basal tooth-like lamella and a broad bifurcate lamella on the 

 columella. 



