— 52 — 



.margin of the labrum is of a dull brown earth-colour and the umbilicus is 

 more open. 



Alt. 18.25, diam. niaj. 11. 5, diam. min. 9 mm. 



Aperture : ait. 7.5, diam. 4.5 mm. 



Hab. — Masaka, Uganda, together with the tvpical form 

 (Robin Kemp). 



Cerastus partulaeformis sp. n. — PI. IV, fig. 2. 



Shell ovately fusiform, white shading to cream-colour on the latter half 

 of the last whor], whorls 6, regularly increasing, sligthly polished, the upper 

 whorls marked with rather coarse, oblique, transverse growth striae, the last 

 malleated and sculptured with irregular, scratch-like, spiral striae in 

 addition to the growth lines which are much coarsened; suture impressed; 

 umbilicus narrow, deep, half coucealed b)^ the broad expansion of the 

 columella lip; columella descending in a slightl}' angular curve, tinged 

 with dark chestuut-purple above and diffused into a well defined, cream- 

 coloured callus which reaches the upper margin of the labrum; labrum white, 

 rather broadl}^ expanded especially below, narrowly reflexed, rather coarsel}^ 

 roughened in texture; aperture inversel)^ auriform; interior of shell whitish, 

 granular, tinged with an ill defined band of lilac-chestnut just within the 

 aperture and across the pariétal walI. 



Alt. 18.25, diam, maj. 12, diam. min. 8.5 mm. 



Aperture : ait. 8, diam. 4 mm. 



Hab. -^ Lake Kivu (Robin Kemp). 



An extraordinary shell which together with the preceding 

 species recalls the genus Partula from the Western Islands of 

 the Pacific Océan. 



Leucochiloides consanguineussp. n. — PI. IV, fig. 5. 



Shell differing from L. gaziensis, Preston (') in its smaller size, 

 narrower form, much more inflated whorls and consequentl}^ still more 

 deeply impressed suture. 



Alt. 3.5, diam. maj. 1.5 mm. 



Aperture : ait. 075, diam. 0.25 mm. 



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



(■J Froc. zool. Soc, London, 1912, p. t88, pi. XXX[, fig. 19. 



