'■196 MR. H. B. PRESTON ON AGNATH0U3 



margin of the labrnm : labrum thickened, expanded, reflexed and 

 considerably receding below, then scarcely reflexed, projecting 

 and somewhat inwardly bent over the aperture and finally again 

 receding o>bove ; apei'ture very broadly and compressedly, obliquely 

 sublunate. 



Alt. 11, diam. maj. 20, diam. min. 16 mm. 



Aperture : alt. 8'5, diam. 8"25 mm. 



Hah. Urguess, British East Africa (^. Blayney Percival). 



Ennea buccina, sp. n. (PL XXXII. fig. 11.) 



Shell rather large, edentulate, somewhat ovately trigonal, 

 white ; whorls 6^, the first five rather rapidly, but regularly 

 increasing, the last very large, rapidly ascending in front, slightly 

 diverging from the axis of the remainder, indistinctly, transversely, 

 arcuately plicate, the plicse becoming obsolete on the last whorl 

 which is nearly smooth ; suture lightly impressed ; umbilicus 

 appearing as a very narrow, shallow, curved, elongate depression ; 

 columella descending in a slightly oblique curve, diffused above 

 into a thin, opaque, rather ill-defined, parietal callus which 

 terminates just in front of the upper margin of the labrum ; 

 labrum white, porcellanovis, outwardly expanded and very nar- 

 rowly reflexed except near its upper margin where, though 

 thickened, this is scarcely the case, projecting in front, receding 

 below and slightly above to form a shallow curved sinus ; aperture 

 very oblique, subrectangular, with rounded base. 



Alt. 20-25, diam. maj. 15-5, diam. min. 12'75 mm. 



Aperture: alt. (nearly) 9'5, diam, 5"75 mm. 



Hah. Burunga, Mount Mikeno, Belgian Congo, at an altitude 

 of 6000 feet {Robin Kemp). 



Ennea Margarita, sp. n, (PI. XXXIY. fig. 8.) 



Shell ovate, polished, shining, whitish cream-colour; whoi-ls 6, 

 rapidly increasing, the penultimate gibbous, the last slightly 

 oblique, the earlier whorls sculptured with transverse riblets 

 which become obsolete on the later whorls except at the suture, 

 the last whorl marked with very fine, almost imperceptible, 

 scratch-like, spiral striae ; suture impressed, margined below, the 

 margin rather coarsely sculptured by the terminations of the 

 transverse riblets ; umbilicus (in the adult) quite closed, the um- 

 bilical area being represented by a shallow depression ; columella 

 slightly excavated above, obliquely descending below ; labrum 

 pure white, expanded and narrowly reflexed, the margins joined 

 by a thin, well-defined, parietal callus ; aperture subquadrate, 

 edentulate. 



Alt. 12"5, diam. maj. 7*5 mm. 



Aperture: alt. 5, diam. 3 "25 mm. 



Uab. Kigezi, extreme S.W. Uganda, at an altitude of 6000 feet 

 {Robin Kemp). 



Young specimens are somewhat narrowly, but profoundly, 

 umbilicate. _ 



