tieio Shells from British East Africa. 473 



whorls 4^,, the first three and a half ^e.^■ulally increasing, the 

 last large^ the apical whorls smooth, the later whorls beauti- 

 fully sculptured with fine, glassy, regularly distant, arcuate 

 costulai ; suture well impressed ; columella almost vertically 

 descending, stained with pale reddish chestnut, a moderately 

 thick well-defined parietal callus joining it with the lip above ; 

 labrum simple, acute, receding above and below ; aperture 

 elongately inversely auriform. 



Alt. (j'6, diam. maj. o'5 nmi. 



Aperture: alt. 3'5, diam. 1*75 mm. 



Hah. Mount Kenia, at an altitude of 9000-10,000 feet, 

 British East Africa. 



Kenia, subgeu. nov. 



Shell subulate, transversely striate, with oblique truncate 

 columella, the later whorls, and especially the last, much 

 elongated ; aperture receding at base. 



Type of subgenus, Kenia suturalis. 



Kenia sutwalis, sp. n. (Fig. 28.) 



Shell subulate, thin, semitransparent, polished, shining, 

 yellowish olive ; whorls 7, the last two flattish and more 

 elongate in pro})ortion to the remainder, the upper whorls 

 sculptured with oblique transverse striae, which become less 

 marked on the later whorls ; suture impressed, ornamented 

 with a narrow, cream-coloured, sublateral, marginal band on 

 which the terminations of the transverse striaj are very 

 apparent ; columella descending in a very pronounced curve, 

 obliquely truncate below, diffused outwards and above into a 

 thin whitish callus which reaches the upper margin of the 

 labrum ; labrum simple, acute, receding below ; aperture 

 inversely auriform. 



Alt. 29'5, diam. maj. 8'5, diam. min. 8 mm. 



Aperture : alt. 8' 5, diam. 4*5 mm. 



Hah. Mount Kenia, at an altitude of 0000-10,000 feet, 

 British East Africa. 



Suhulina doJiertt/i^, Smith, from Uganda, specimens of 

 which also occurred on Mount Kenia at from 6000-8000 feet, 

 may perhaps also be included in the present subgenus. 



Kenia iredalei, sp. n. (Fig. 29.) 

 Shell subulate, whitish, covered with a golden-brown 

 * J. Conch. X. p. 319. 



