Ti^RR'.vSTIlIAL AXI> KLirVlATIL)': SHELLS. U)l 



somewhat strong, radiate growth-lines; liase of sliell sliglitly 

 concave ; labruin receding below, the margins joined by a thin 

 callus; aperture subcircular. 



Alt. nearly ';"), diani. ni;ij. nearly 2, diaui. min. 1*5 mm. 



Aperture : alt. -'25, diam. "25 mm. 



Hah. Gazi, British East Africa {lioh'in Kemp). 



Segmextina eussoensis, sp. n. (PI. XXXII. figs, 6, 6 a, 6 h.) 



Shell depressedly orbicular, with concave spire and almost 

 planulate base, ]iale yellowish wax-colour, polished, somewhat 

 shining ; whorls 4:^, rapidly increasing, the last large and rounded, 

 angled above and bluntly carinate at the peiiphery, below which 

 the base of the shell is nearly flat ; suture rather lightly impressed, 

 margined below; umbilicus wide, shallow; labrum thin, rapidly 

 receding l)elow ; aperture depressedly and angularly sublunate. 



Alt. 1'5, diam. maj. 5-25, diam. min. 4-75 mm. 



Aperture: alt. 1'25, diam. I mm. 



Hah. Chanler Falls, Eusso Nyiro, British East Africa {Robin 

 Kemj)). 



Sesmextixa kempi, sp. n. (PI. XXXII. figs. 7, 7 a, 7 b.) 



Shell small, .suborbicular, planulate above and below, with 

 concave spire, white, polished, shining ; whorls 4, the first three 

 small, regularly increasing, the last very large, rounded above, 

 sharply angular below, indistinctly sculptured with microscopic, 

 silky, ti-ansverse striae ; suture impressed, irregular ; umbilicus 

 moderately narrow, and deep ; columella obliquely descending, 

 angled below, extending above into a parietal callus which joins 

 the upper or sutural margin of the last whorl well within the 

 shell ; labrum acute, receding below ; aperture triangular. 



Alt. 1, diam. maj. 3*75, diam. min. 2-25 mm. 



Hah. Kigezi, extreme S.W. Uganda, at an altitude of 6000 ft, 

 (Robin Kemp). 



Vivipara rubiounda, v. Martens, var. kisumiexsis, var. n. 

 (PL XXXJI. fig. 9.) 



Shell diftering from the typical form in its larger size, darker 

 colour, and in being proportionately higher and narrower, the 

 aperture is also more ovate and the peristome edged with black, 



Alt. 28, diam. maj. 15"75, diam, min. 12 mm. 



Aperture : alt. 10, diam. 7 mm. 



Hah. Kisumi, Lake Victoria Nyanza, British East Africa 

 (Robin Kemp). 



Assimaxia aurifera, sp. n. (PI. XXXI. fig. 9.) 



Shell turbinate, pei'forate, thin, semitransparent, dai-k brownish 

 liorn-colour, minutely and densely freckled with golden 3'ellow ; 

 whorls 5|, regularly increasing, shouldered above, convex, very 

 minutely s})irally striate ; suture well impressed ; unibilicus 

 moderately wide, deep ; columella very oblicpie, obtuse-angled, 



