— 51 — 



columella broacDy, outwardly expaaded above, almost vertically descend- 

 ing, diffused above into a laint callus which scarcely reaches the upper 

 margin of the labrum; labrura }'ello\snsh-flesh colour, somewhat dilated, 

 expanded and reflexed; apertui'e somewhat shortly inversai}' aurifonn. 



Alt. 23, diam-maj. 13^ diam. min. 11 mm. 



Apeiture : ait. 10, diam. 5.75 mm. 



Hab. — Near Lake Kivu (Robin Kemp). 



Cerastus Kempi sp. n. — PI. IV, fig. 3. 



Shell ovatel}' fusifonn, yellowish-olive in colour, painted internally 

 with an infrasutural, spiral band of deep purple which shows through the 

 test more faintly on the lower whorls as the shell thickens, and a verj^ broad, 

 internai, circum-umbilical band of the same colour which also shows dully 

 through the test; whorls 6, the first fîve regularly increasing, the last 

 rather large, polished, shining, marked with minute, scratch-like, hori- 

 zontal striae and oblique, transverse plicae, the latter being more noticeable 

 in the infrasutural région and becoming obsolète on the last whorl, the last 

 whorl is also much malleated, the malleation becoming much coarsertowards 

 the labrum; suture impressed, slightl}^ irregularly crenulate and narrowly 

 margined below; umbilicus narrow, deep, almost entirel}^ concealed by the 

 outward réflexion of the columella; columella descending in acurve, the inner 

 zone stained with deep purple, the médian zone white, the onter zone stained 

 with }^ellowish-flesh colour, almost laminiferous, reflexed; labrum white, 

 with outer margin flesh-coloured, expanded and reflexed, laminiferous and 

 somewhat roughened, projecting in front and again above, receding below 

 and above between the projecting portions; aperture irregularl}^ ovate, 

 rather oblique; interior of shell and pariétal wall painted round with a 

 broad band of purple. 



Alt. 17, diam. maj. 10.25, diam min. 8 mm. 



Aperture : ait 6.75, diam. 4.25 mm. 



Hab. — Burunga, Mount Mikeno, Belgian Congo, at an 

 altitude of 6,000 feet (Robin Kemp). 



In some spécimens the whole of the apical whorls are painted a 

 dark purple, while in others the entire labrum is suffused with 

 reddish-purple. 



Cerastus Kempi var. masakaensis var. n. 



Shell ditfering from the typical form in being of a pale straw-colour and- 

 in lacking the purple colour bands both suturai and otherwise, the outer 



