from Portuguese South-east Africa. 115 



Lon<^. 0-.2 ; hit. 3*3 ; apert., alt. 1-7, hit. 1'2 ; last whorl 

 3*5 mill. 



Type-locality. District iiurtli of Macequece (Zi. Cressy). 



Guletlu prdelotiyu, sp. n. 



Shell elongate, cyliiulrical, riuiate, somewhat caleiued in 

 the type, hut normally thin, pale olivaeeous, senii-ti'ans- 

 parent, with a silky sln-en. 8pire much produced, sides 

 almost parallel, apex rounded to a hlunt point. Wliorls 

 7^, Hattish, gradually and regularly increasing, the apical 

 smooth, remainder covered with close, regular, almost 

 straight, transverse striie, which extend into the sutures and 

 are just visil)le without a lens; suture shallow, but well- 

 deriued. Aj)erture subquadrate, only slightly rounded at 

 base; peristome white, very narrowly reHexed ; columellar 

 margin more broadly so, almost concealing the rima. Dental 

 pn)cesses three: an inconspicuous columellar fold or swelling ; 

 a small parietal |)lait, starting at the junction of the outer 

 lip and paries and only receding an extremely short distance 

 within the shell ; and a very small single denticle, corre- 

 sponding to a hardly noticeable external depression halfway 

 down the outer lip. 



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

 41 mm. 



Type-locality. Mount \'cngo, Macequece District {B. 

 Cressy). 



(iulella tristaoensis, sp. n. 



Shell small, rimate, cylindrical, rather thin, moderately 

 glossy, transparent, pale olivaceous. Spire produced, sides 

 |)arallel,apex bluntly rounded. Whorls 7, somewhat convex, 

 gradually increasing, the last exceeding half the length of 

 the shell ; the first 2 smooth and shining, remainder covered 

 with close, })romiiient, regular, nearly straight, transverse 

 striie ; suture well defined. Aperture nearly circular, outer 

 lip somewhat bowed outward immediately below the suture ; 

 columella almost straight ; peristome white, shining, re- 

 Hexed; dental processes three: a moderate-sized, almost 

 straight, parietal jdait, not reaching far within the shell ; a 

 small sharp tooth on the slight sinuosity of the outer lip 

 and a blunt fold on the columella, sinne distance within the 

 aperture. 



Long, 5'3 ; lat. 2*3; last whorl 28 mm. 



Type-locality. District north of Maeecjuecc {B. Cressy). 



