790 MR. H. B. PRESTON ON NEW GENERA AND 
periphery; sculptured with extremely fine, closely-set, wavy, 
microscopic, spiral strie, which appear to be rather coarser in the 
subsutural region ; suture impressed, narrowly margined below ; 
perforation narrow, internally slightly angled and sculptured with 
somewhat distant and coarse, spiral lire crossed by radiate growth- 
puckerings ; columella descending in a curve, very slightly out- 
wardly retlexed above; labrum simple; aperture obliquely and 
compressedly sublunate. 
Alt. 3°25, diam. maj. 6, diam. min. 5:25 mm. 
Aperture: alt. 2, diam. 2-5 mm. 
Hab. Between Entebbe and Masaka, 8.W. Uganda. (Robin 
Kemp.) 
The internal sculpture of the umbilicus somewhat resembles 
the pattern of a spider’s web, hence the trivial name. 
GUDEELLA BARTAENSIS, sp.n. (PI. IIL. fig. 6.) 
Shell very depressedly turbinate, pale brownish yellow ; 
whorls 43, regularly increasing, sculptured throughout with very 
fine, closely-set, wavy, spiral striz ; suture impressed, very nar- 
rowly margined ; umbilicus narrow, deep; columella outwardly 
veflexed above, very slightiy obliquely descending; labrum 
simple; aperture sublunate. 
Alt. 3°5 (nearly), diam. maj. 6°25, diam. min. 5:25 mm. 
Aperture: alt. 3, diam. 2:75 mm. 
Hab. Barta Steppes, British East Africa, (A, Blayney 
Percival.) 
GUDEELLA KAMPALAENSIS, sp. n. (PI. IIL. fig. 10.) 
Shell differing from G. bartaénsis Preston in its smaller size, 
much more narrowly margined suture, and in being microscopically 
spirally striate throughout; the aperture is also more obliquely 
and compressedly sublunate. 
Alt. 3, diam, maj. 5°25, diam. min. 5 (nearly) mm. 
Aperture: alt. 2°25, diam. 2°25 mm. 
Hab. Kampala on Lake Victoria Nyanza, 8.W. Uganda; also 
found at Entebbe and Jinga in the same district. (Robin Kemp.) 
GUDEELLA URGUESSENSIS, sp. n. (PI. ITI. fig. 17.) 
Shell closely allied to G. bartuénsis Preston, but rather broader, 
with wider umbilicus and much more oblique columella; the 
aperture is considerably broader, though no higher, and the 
microscopic spiral sculpture is much finer than is the case in that 
species. 
Alt. 3°75, diam. maj. 6°75, diam. min. 6 mm. 
Aperture : alt. 2°25, diam. 2:75 mm. 
Hab. Urguess, British East Africa, (A. Blayney Percival.) 
GUDEELLA CONSUETA, sp. n. (Pl. III. fig. 18.) 
Shell thin, depressedly turbinate, polished, shining, pale reddish 
brown ; whorls 44, regularly increasing, the last subangulate at 
