African X(m-nhtr{>ie Molhtsra. 4'JL 



Obviously uvar akin to /*. ((;/ii(iitiriiih\ I'ilsbrv, from the 

 Ituri Forest, lU-I^ian Coii<(o. Tliu hist-iKiiiicd, however, is 

 typically a larger form, .'VO mm. in length, witli a|)|)arently 

 more distant stri:e, while the palatal fold terminates in a 

 conspicnous denticle on the enter lip, a featnre entirely 

 laekin}; in the new species, in which, moreover, the parietal 

 hunella is sitnated nearer the centre of the paries and none 

 of th(! dentition is of snlHcient proniineiiee to be noticeable 

 in the photographic fiji^nre. 



Genus Gulki.la, IMeiller, lb5(5. 

 Gidelhi hitzeensis, sp. n. 



Shell comparatively large, rimate, elongate-oval, thin, 

 smooth, glossy, transparent, pale olivaceous. Spin; pro- 

 duced, sides slightly ami regularly convex, apex rounded. 

 Whorls f), tlattish, regularly increasing, protoconch sparsely 

 microscopically malleate, and all but the apical whorl 

 sculptured with extremely faint, oblique, transverse strife ; 

 suture simple, shallow. Aperture nearly triangular, narrowly 

 rounded at base; peristome white, shining, broadly rcHexed ; 

 columella long and straight, rima long and shallow ; callus 

 faint ; dentition as follows : — a large lamella, incurved on 

 the right and hooked to the left, at the junction of paries 

 and outer lip (in the type there is no other parietal process, 

 but a mid-parietal denticle is present in the generality 

 of specimens) ; a large scjuare tooth, showing slight trace of 

 bitidity, arising from a small external cavity, halfway down 

 the outer lip, with a small sharp denticle above, midway 

 between it and the paries; a minute mid-basal denticle and 

 two large, narrow, horizontal columellar teeth, the lower of 

 which enters deeply with a slight curve, the uj)per straight 

 and only shortly entering. 



Long'. Il-;3, fat. G-.'2 ; apert., alt. I'O, hit. 3-7 ; last whorl 

 ()"8 mm. 



This species forms one of a group with G. cavidens (Mts ) 

 and acutidena (lUtg.), the three being distinguishable as 

 follows : — 



G. cavidens: the upper columellar denticle is very small 

 and situate on the t xtrcme edge of the inner margin of the 

 columella ; the lower C'dunu'llar tooth or fold is rather 

 dec|)ly entering from the edge inwards and slightly down- 

 wards, curved into a hollow on its upj)cr side ; the lower 

 tooth on the outer lip is nearly S(piare ; the shell exaniined 

 measures 13"0x(j(j mm. 



