284 PROCEEDINGS OK THE MALACOLOGICAL SOCIETY. 



outwarcUj- expanded, but scarcely reflexed, diffused above into a tbin, 

 polisbed, cleai'ly defined, and restricted parietal callus wbich reaches 

 the interior sutural region just behind the upper margin of the 

 labrum ; labruni slightly reflexed below, simple above ; aperture 

 rather broadly inversely auriform ; interior of shell pale lilac, shading 

 to a darker tint of the same colour. Alt. 40-5 mm. ; diam. maj. 

 2025, min. 18 mm. Aperture: alt. 16*25, diam. 11-5 mm. 

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



Kkapfiella. princeps, n.sp. 



Shell fusiform with acute apex, moderately solid, uniformly 

 reddish chestnut ; whorls 8, the first very small, the remainder 

 regularly increasing, somewliat convex, the earlier whorls coarsely 

 spirally striate, the remainder closely and fineh' transversely 

 costulate ; suture impressed, finely crenellated by the terminations 

 of the transverse costulse ; umbilicus very narrow, partly concealed 

 by the outward expansion of the columella; columella rather 



obliquely descending, diffused above into a very thin, shining, well- 

 defined and somewhat restricted parietal callus which reaches the 

 upper margin of the labrum ; labrum thin, acute, slightly dilated 

 below; aperture inversely auriform. Alt. 41-5 ram. ; diam. maj. 

 32-25, min. 17-75 mm. Aperture: alt. 15-25, diam. 7-75 mm, 



Hab. — Mt. Nyiro, to the south of Lake Rudolph, at an altitude of 

 8,300 feet (A. Blayney Percival); also collected by Mr. Percival on 

 the Barta Steppes to the south of Mt. Nyiro, at an altitude of 

 4,000 feet. 



