— 49 — 



Hab. — Mount Nyiro, to the South of Lake Rudolph 

 (A. Blayney Percival). 



Martensia voiensis sp. n. — PI. V, fig. 3. 



Shell perforate, subdiscoidal, depressedly turbinate, yellowish, occa- 

 sionally irregularly marked with transverse streaks of ashen gra}^ wliich are 

 more apparent on the last M'horl and the base of the shell; whorls 6,regu]arly 

 increasing, the last carinate at the periphery, sculptured with moderately 

 coarse, oblique and somewhat curved, transverse, closel)^ set costulae ; suture 

 impressed, narrovidy margined above with a cream coloured, thread-like 

 ridge; baseof shell marked with growth lines and sculptured with fine, wavy, 

 revolving striae only; umbilicus somewhat narrow, partly concealed bjr the 

 reflexion of the columella; columella curved above, oblique]}- descending 

 below; labrum simple; aperture subquadrate. 



Alt. 12.5, diam. maj. 21, diam. min. 18.25 mm. 



Aperture : ait. 9, diam. 10.25 mm- 



Hab. — Voi, British East Africa (W. Feather). 



Martensia inflata sp. n. 



Shell rimate, turbinate, inflated, thin, semi-transparent, whitish-yellow; 

 whorls 6 '/=, regularly increasing, the last subangulate at the peripher)'', the 

 apical whorls spirall)^ striate the remainder sculptured' with moderately fine 

 and closely set, oblique arcuate costulae; base of shell marked with fine, 

 somewhat distant, wav}^, revolving, scratch-like striae; suture impressed; 

 umbilicus narrow, deep ; columella tinged with pale lilac, rather obliquely 

 curved, broadly,outwardly expanded above and diffused into a thin, well 

 defined, outwardh' spreading, pariétal callus wich reaches the upper margin 

 of the labrum; labrum simple, acute; aperture obliquely, broadly sublunate. 



Alt. 14, diam. maj. 18-25, diam. min. 16.5 mm. 



Aperture : ait. 9.75, diam. 8.75 mm. 



Hab. — Urguess, British East Africa (A. Blayney Percival). 



Martensia solida sp. n. — PL V, fig. 5. 



Shell perforate, turbinate, very solid, calcareous, brownish-yellow above, 

 pale straw-colour beneath, the spire encircled by a broad, indistinct, 

 pale reddish, supersutural band which increases to two, one above and one 

 below the periphery, on the last whorl ; whorls 6 V2, regularly increasing, 

 flattish, the last bluntly angled at the peripher}^, the fîrst whorl ver)"- finely, 



