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
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