DIAGXOSES 



m SPECIES OF TERRESTRIAL A\D FLIVIATILE SHELLS 



FRO.M 



BRITISH EAST AFKICA AXD UGANDA 



H. B. PRESTON, F. Z. S. 



(Wilh Plaie XVn.) 



Streptostele exasperata, sp. n. — PL XA'II, fig. ii. 



Shell subulately fusiform, moderately solid, shining, wax-coloured; whorls 

 lo-ii, flattish, the earlier whorls nearly smooth, the remainder sculptured 

 -with regular, closely set, somewhat fine, transverse costulae; suture impress- 

 ed; columella thickened, whitish, outwardly expanded, almost Terticalh' 

 descending ; labrum thickened, scarcely reflexed, shghtly recedmg above ; 

 aperture van* irregularly subquadrate. 



Alt. II, diam. maj. 3 mm. 



Aperture : ait. 2.25, diam. i mm. 



Hab. — Mount Kenia at an altitude of from 6-9000 ft (Robin 

 Kemp ' . 



Streptostele polymorpha, sp. n. — PI. XVII, lig. 14. 



Shell rimate, subulately fusifonu, cream coloured; whorls S ' ,, flattish, 

 the first two and a half smooth, the remainder sculptmed with rather coarse 

 and slightlr distant, tiansverse costulae; suture impressed; umbihcus naiTow, 

 concealed in front by the outward expansion of the columella; columella 



