SPECIES OF ZONITIDE FROM EQUATORIAL AFRICA, 793 
Alt. 5°25, diam. maj. 7°75, diam. min. 6°5 mm. 
Aperture: alt. 4:25, diam. 3°75 mm. 
Hab. Barunga, Mount Mikeno, Belgian Congo, at an altitude 
of 6000 feet. (Robin Kemp.) 
GUDEHLLA IRIDESCENS, sp. n. (PI. III. fig. 15.) 
Shell allied to @. inclinans Preston, but rather larger, though 
having the same number of whorls and with coarser spiral 
Sculpture, the sutural margin is broader and the columella 
descends vertically above, and is then angled and very oblique 
below, the aperture consequently being broader than in G. in- 
clinans; when placed under the microscope the surface of the 
shell appears to be highly iridescent. 
Alt. 4:25, diam. maj. 7°75, diam. min. 6°20 mm, 
Aperture: alt. 3°25, diam. 3°5 mm. 
Hab. Mount Mikeno, Belgian Congo. (Robin Kemp.) 
GUDEELLA MARSABITENSIS, sp. n. (PI. III. fig. 22.) 
Shell somewhat depressedly orbicular, thin, semi-transparent, 
pale reddish brown ; whorls 5, regularly increasing, the last sub- 
angulate above, sculptured with very fine, wavy, closely-set, spiral 
striz ; suture impressed, margined below, the margin rather more 
coarsely spirally striate than the remainder of the surface and 
having the spiral striz crossed by very oblique, scratch-like lines ; 
base of shell moderately convex, sculptured with exceedingly fine, 
microscopic, wavy, spiral stri# and coarser, somewhat distant, 
revolving lines; umbilicus rather wide, deep; columella margin 
outwardly expanded above, curved, obliquely descending below ; 
labrum simple ; aperture obliquely sublunate. 
Alt. 3°5, diam. maj. 6°75, diam. min. 6 mm. 
Aperture: alt. 2°75, diam. 3 mm. 
Hab. Northern slopes of Mount Marsabit, British East Africa, 
at an altitude of 4600 feet. (A. Blayney Percival.) 
GUDEELLA MASAKAENSIS, sp.n. (Pl. III. fig. 16.) 
Shell very depressedly turbinate, olivaceous brown, polished, 
shining; whorls 4, regularly increasing, sculptured with very 
fine, wavy, closely-set, microscopic, spiral striz ; suture impressed, 
margined below, the sculpture on the margins, as also on the base 
of the shell, being slightly coarser than on the remainder of the 
upper surface; umbilicus narrow, not deep; columella margin 
outwardly reflexed above, descending in a very oblique curve, 
extending into a very thin, but well-defined, parietal callus which 
enters the mouth of the shell just behind the upper margin of 
the labrum ; labrum simple, receding below ; aperture obliquely, 
broadly, and rather compressedly sublunate. 
Alt, 2°5, diam. maj. 5, diam. min. 4°25 mm. 
Aperture: alt. 1:75, diam. 2 mm. 
Hab. Between Entebbe and Masaka, S.W. Uganda. (Robin 
Kemp.) 
