African you-iiiarnic Molluscn. .'» 1 ;"> 



strai<;lit, tnjicrin*;^ very {gradually to the roimdcd a|)cx. 

 Wliorls 7, not very convex, n-j^'iilurly and slowly increasing;, 

 practically smooth except for a few vertical j^rowtli-liues and 

 several extremely faint, close, rather irregular, incised spiral 

 striaj, which are almost invisible on the type, but arc just 

 noticeable under a inicroscoj)e on all the whorls ol: a less 

 mature shell ; suture simple, a little impressed. A|icrture 

 snbovatc ; peristome thin, simple ; columella erect, sli|^litly 

 thickened u[)warils, margin most narrowl}' rcflexed at the 

 base, forming a minute rimation ; callus pronounced ; 

 dentition none. 



Long. -IS, lat. r3 ; last whorl 1*8 ram. 



Ila/j. Kknya, Mt. Kenya. 7000-9000 ft. {Kemp) ; between 

 the Igeiubi Hills and Xyeri {Percival). 



Streptostele {Graptostele) jod, sp. n. 



Differs from the foregoing mainly in having more convex 

 whorls and deeper suture; the incised spiral sculpture also 

 is closer and stronger after the 2nd whorl and the last 

 2 whorls show a little faint, close, vertical striation. The 

 shell contains 7 whorls and measures : — long. -l-'G, lat. 1'5 ; 

 last whorl TO mm. 



Hub. Kenya, Rumruti [Kemp). 



Genus Vakicostele, Pilsbry, 1919. 



Comparatively large, nearly smooth shells, differing from 

 Streptostele^ s. s., in the peristome remaining simple and acute 

 at all stages of growth, without thickening, rctlexion, or 

 expansion. 



I agree with Pilsbry that Subidina roccatii, Pollonera, 

 belongs to this genus. 



Vuricostele rutslntruensis, Pilsbry, 1919. 

 I attribute to this species a shell collected by Kemp on 

 the shore of L. Mutanda, in the extreme south-west corner 

 of Uganda, less than 20 miles from Rutshuru. It agrees 

 well with the description of rutshuruensis and is commen- 

 surate with the second example whose measurements are 

 given by Pilsbry; its ai)ex, however, is noticeably broader in 

 proportion than that of Pilsbry's enlarged figure, tlunigh 1 

 cannot say whether this is due to slight inaccuracy in drawing 

 or to individual vaiiation in the shell. 



Vuricostele lesstnsis, Pilsbry, 1919. 

 Here, again, shells collected in Uganda by Kemp at Kigezi 

 and by Dumnier at Abiri appear inse|iaralile from another 



