804 MR. H. B, PRESTON ON NEW GENERA AND 
URGUESSELLA ESAU, sp. n. (PI. III. fig. 26.) 
Shell allied to U. urguessensis Preston, but differing con- 
siderably from that species in its thinner texture, smaller size, 
more reddish colour, less planulate spire, subangulate last whorl, 
and much finer and shorter hairs, which are arranged in very 
oblique rows, but running at a much less acute angle to the 
suture than in U. wrguessensis; the columella is also higher and 
more angularly curved, while the aperture is roundly ovate. 
Alt. 4°75, diam. maj. 9, diam. min. 7‘25 mm. 
Aperture: alt. 3°75, diam. 3°75 mm. 
Hab. Urguess, British East Africa. (A. Blayney Percival.) 
URGUESSELLA CAPILLATA, sp. n. (PI. III. fig. 28.) 
Shell suborbicular, depressed, with almost planulate spire, thin, 
pale reddish brown; whorls 4, regularly increasing, the last 
descending in front, sculptured with corrugated, closely-set, 
obliquely arcuate, transv erse plice, bearing at intervals broad 
bristly hairs; suture impressed; base of shell slightly convex ; 
umbilicus moderately wide, deep; columella broadly outwardly 
reflexed above and diffused into a thin, ill-defined, glassy, parietal 
callus, descending in a vertical curve; aperture obliquely sub- 
lunate. 
Alt. 3°25, diam. maj. 7, diam. min. 6 mim. 
Aperture: alt. 3, diam. 2°5 mm. 
Hab. Burunga, Mount Mikeno, Belgian Congo, at an altitude 
of 6000 feet. (Robin Kemp.) 
URGUESSELLA CUTICULARIS, sp. n. (PI. ITI. fig. 27.) 
Shell thin, suborbicular, with depressed spire, covered with a 
shortly hispid, dark Neowen periostracum ; whorls 43, regularly 
increasing, marked with very oblique, arcuate, transverse plica- 
tions, the last whorl angulate at the periphery ; suture impressed ; 
base of shell rather inflated ; umbilicus rather broad, open, deep ; 
columella broadly outwardly expanded above, descending in an 
oblique curve ; labrum simple; aperture subrectangular. 
Alt. 4, diam. maj. 7, diam. min. 6 mm. 
Aperture: alt. 3°5, diam. 3 mm. 
Hab. Malasanji, 8.W. Uganda. (Robin Kemp.) 
TROCHOZONITES BUHAMBAENSIS, sp. n. (Pl. II. fig. 23.) 
Shell acutely conic, pale brown, somewhat polished ; whorls 7, 
slightly convex, the first three somewhat slowly increasing in 
breadth, smooth, the remainder rather rapidly increasing, sculp- 
tured with coarse, oblique, transverse riblets, the last whorl 
strongly carinate at the periphery ; suture impressed, very 
narrowly margined; base of shell nearly smooth; umbilicus 
narrow and very deep, partly concealed by the reflexion of the 
columella margin ; columella margin outwardly expanded above, 
