— 50 — 



spirally striate and minutely grauular, the remainder sculptured with fine, 

 closely set, very oblique, soinewhat arcuate, trausverse costulae; base of 

 shell marked with growth lines and moderatel)' fine, spiral, wavy, scratch- 

 like striae; suture impressed, verj narrowlj' margined above with an 

 indistinct, spiral, whitish ridge-like callus; umbilicus narrow, deep, partly 

 concealed by the outward expansion of the columella; columella descending 

 in a ver}^ oblique curve. 



Alt. 16.26, diam. maj. 22.5. diam. min. 21 mm. 



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

 (A. Blayney Percival). 



A very remarkable species of which, unfortunatel)', only a single spéci- 

 men was collected and which is so much broken at the mouth as to make it 

 impossible to describe the labial and apertural characters ; it is possible that 

 in perfect spécimens the umbilicus may be almost sealed b}' the outwai'd 

 expansion of the columella and probabl}' the aperture is broadl}^ sublunate in 

 shape; the size, colou'ring and great solidity of the shell however easity 

 separate it from auy other member of the group as yet described. 



Ena kivuensis sp. n. — PI. VI, fîg. i. 



Shell differing from Glmidina boivini MoREL f), chiefly in the columella, 

 which is shorter and more oblique, in the labrum which is slightly more 

 dilated below and bent inwards over the aperture above, and in the aperture 

 which is much shorter and broader and is not angled at the base of the 

 columella. 



Alt. 22.5, diam. maj. 10.25^ diam. min. 8.75 mm. 



Aperture : ait. 8, diam. 5 mm. 



Hab. — Kisengi, Lake Kivu (Robin Kemp). 



Cerastus kivuensis sp. n. — PI. IV, fig. i. 



Shell rimate, ovately fusiform, moderatel}' tliin, pale brown, slightl}' 

 polished; whorls 6, marked with regular, oblique, transverse costulae and 

 sculptured with fine, transverse and spiral striae theus presenting a somewhat 

 finely decussate appearance ; suture narrowly margined below; perforation 

 narrow^ deep, partly concealed by the outward expansion of the columella; 



(') MoRELET, sér. Leriche, p. 72. 



