African Xon-t)i<irine Midlusca. r>07 



and very ^raduiilly iIlcrcasiIl<,^ the fust I. closely, but very 

 faintly, inicrroscopically piimlatc, rciiiaiiidcr sculptured witli 

 close, very faint tliouj;!! rather bro.id, curved, somewhat 

 ol)li(iue, transverse stria.'; suture moderately oblicjue, sub- 

 crenulate, well defined. Aperture subrhombic, peristome 

 simple, thin ; outer lip but little curved, hardly arched for- 

 ward and then recedin;^ f^^radually to the base; columella 

 strai«^ht and erect, marji^in narrowly rcHexed, forming a 

 minute rima ; callus and dentition none. 



Long. 11-7, lat. 2-7; apert., alt. 2-2, lat. 1-2 ; last whorl 

 40 mm. 



Hab. Kenya, Urguess (Percivul). 



The long straight-sided spire and faint, yet coarse, 

 sculpture distinguish this species from any of its neighbours; 

 it has tiatter whorls than ^. crenulata (Smith). 



Streptustele c/avulus, sp. n. (PI. XIV. fig. 17.) 



Shell of moderate size, acicular, subrimate, thin, smooth, 

 shining, bleached in the type, but normally transparent 

 and pale olivaceous-vitreous. Spire produced, sides almost 

 straight, apex narrowly rounded. Whorls 9, flattened, 

 regularly and gradually increasing, the last showing a faint 

 trace of basal angulation, the first 2 smoothly, dcnselv, 

 microscopically punctate, remainder sculptui'cd with ex- 

 tremely faint, regular, almost straight and vertical stria^, 

 which, under a lens, are only a|)parent in tlie stitnres on tlie 

 4th and 5th whorls, and gradually bcconie more visible on 

 the later ones ; suture slightly oblique, crenulate, shallow. 

 Aperture sub-piriform, rounded at base ; peristonu^ thin, 

 simple ; outer lip curved a litle outwards, receding in 

 profile gradually to the base ; columella straight, a little 

 inclined inwards, margin very narrowly reficxed ; callus and 

 dentition none. 



Long. 8-5, lat. 2-3 ; apert., alt. 2-0, lat. 0-8 ; last whorl 

 3 5 mm. 



Hah. Kenya, Larogi Hills ( Perciral). 



The type is somewhat bleached and immature, l)ut quite 

 distinct by reason of its flattened whorls ; it diflers clearly 

 in sculpture from S. hast a. 



Sirejjlostele crassicrcitulata, sp. n. (PI. XI\'. fig. 18.) 



Shell of moderate size, acicular, subrimate, thin, smooth, 

 shining, transparent, pale olivaceous-vitreous. Spire pro- 

 duced, sides very slightly convex at tlie 7th whorl, apex 

 acute. \N horls 10, rather flat, very gradually increasing. 



