-48 - 



marked with ver)'- coarse, transverse, arcuate growtli pli cas; suture well 

 impressed; umbilicus moderatel}' narrow, verj^ deep; columella descending 

 obliquel)', outwardl}' reflesed above; labrum acute; aperture very broadl}- 

 sublunate. 



Alt. 12, diam.-maj. i6, diam.-min. 13 mm. 



Aperture : ait. 6-5, diam. 7 mm. 



Hab. — Nakurii, British East Africa (Robin Kemp). 



Martensia levistriata sp. n. — PL V, fig. 2. 



Shell perforate, rather depressedlj' conic, shining, light reddish chestuut 

 encircled by a narro"n", white, supersutural ridge vv-hich appears as a whitish 

 keel on the last whorl; whorls 6, scarcely inflated, the first whorl atid a half 

 minutel)', spirall)^ striate, the remainder sculptured with very fine, closety 

 set, somewhat arcuate, oblique, transverse striae; suture impressed, 

 margined above with the white ridge above mentioned ; base of shell sculp- 

 tured with rather close^ wavy, spiral striae; umbilicus moderately narrow, 

 deep; columella outwardly espanded above, descending in a somewhat 

 oblique curve, a thin, well defined, pariétal callus joining it with the lip 

 above ; labrum thin, acute; aperture obliqueh- sublunate. 



Alt. 12, diam. maj. 19, diam. min. 16.5 mm. 



Aperture : ait. 7.5, diam. 8.5 mm. 



Hab. — Between Mt. Kenia and Eusso Nyiro, British East 

 Africa (Robin Kemp) . • 



Martensia nyiroensis sp. n. — PI. V, fig. i. 



Shell depressedly, turbinate moderately thin, polished, yellowish-white, 

 painted on the upper whorls with a light red, narrow, supersutural band and 

 on the last whorl with two rather broad, spiral bands of the same coloiu", one 

 just above and one immediatel)' below the peripher)'' ; whorls 6 ',,, the first 

 three somewhat exserted, the remainder sloping, not ver}^ convex, sculptured 

 with fine, closel}' set, oblique, arcuate, transverse striae; suture impres- 

 sed ; base of shell marked with lines of growth and sculptured with fine, 

 wav)' somewhat closely set, revolving striae ; umbilicus moderatelj- narrow, 

 deep, partially covered by the outward expansion of the columella; colu- 

 mella ontwardl}'' expanded, descending rather obliquely, angled below ; 

 labrum simple, receding basall)' ; aperture broadh' sublunate. 



Alt. 13, diam. maj. 20, diam. min. 18.25 nim. 



Aperture : ait. 9, diam. 9.25 mm. 



