African Non-marine Mollusca. 493 



somcwliat similnr sculpture, has a double tooth on the 

 colunulhi. 



Giilella cnndela, sp. ii. (PI. XIV. fif;. 28.) 



Slu'll very sinall, eylindrical, perforate, smooth, <(lossy, 

 nearly transparent, pale milky olivaceous. Spire produeed, 

 sides jjarallel, apex luamiliate. Whorls G, Hrst 2 rapidly 

 increasing, remainder nearly equal ; the sculpture, which is 

 hardly visible under a microscope except on the last 3 whorls, 

 consists of faint, rather close, slightly curved and oblique, 

 transverse striie, stron^^est just i)elow the suture, which is 

 simple and rather shallow, thouirh well defined. Aperture 

 siibqnadrate ; peristome white, shining, rellexed ; columella 

 straight, rima deep; callus pronounced; dental process 

 i'our-fold : — a prominent inrunning lamella at the junction 

 of paries and outer lip ; a very large triangular tooth on the 

 outer lip, corresponding to a deep external cavity with 4 or 5 

 strong puckers behind it; a small tubercle to the left of the 

 base and a broad blunt fold deep-set on the columella. 



Long. 4'3, lat. 1"4; last whorl TO mm. 



Hab, Kenya, Taru Desert {Percival}. 



Var. ex forma miiiur. 



Similar to type, but containiufr only 5^ whorls and con- 

 siderably smaller, measuring : long. 3 3, lat. 1'2 ; last whorl 

 1*5 mm. It occurs in the same district, l)ut has not yet been 

 found in company with the type. 



This little species resembles in shape and size G. (jicen- 

 dolime and G.foveolata (Preston). In ywendolina', however, 

 there is a flouble eoluinellar tooth and 2 clear teeth on the 

 outer lip, while in foveolata there are 2 basal denticles, and 

 the tooth on the outer lip has an upper cusp, with which the 

 parietal plait interlocks. 



Gidella pisa, sp. n. (PI. XIV. fig. 21.) 



Shell very small, elongate, imperforate, rather solid, semi- 

 transparent, pale milky olivaceous. Spire produced, very 

 slightly inclined to the right, apex rounded. Whorls G, 

 nearly flat, regularly and very slowly increasing, the first 

 smooth, remainder sculptured with close, strong, straight, 

 regular, vertical rib-strife, fainter and closer on the 2nd 

 than ou the succeeding whorls; suture simple, rather deeply 



