SPECIES OF ZONITIDA FROM EQUATORIAL AFRICA. 805 
vertically descending ; labrum acute, simple; aperture irregularly 
subrectangular. 
Alt. 7, diam. maj. 6°25, diam. min. 5°25 mm, 
Aperture: alt. 2°75, diam. 2°25 mm. 
Hab. Buhamba, near Lake Kivu, Belgian Congo. (Robin 
Kemp.) 
TROCHOZONITES EXPATRIATA, sp. n. (PI. II. fig. 21.) 
Shell conical, with obtuse apex and very slightly constrieted 
sides, very thin, reddish brown, glossy ; whorls 6, the last two 
rather convex, the last acutely carinate at the periphery, sculp- 
tured with course, oblique growth-ridges ; suture faintly incised, 
narrowly eallously margined above ; base of shell nearly planulate ; 
umbilicus very narrow, almost entirely concealed by the outward 
expansion of the columella; columella margin descending in a 
very slight and very oblique curve; labrum sunple; aperture 
subrectangular. 
Alt. 6, diam. maj. 6°5, diam. min. 6 mm. 
Aperture: alt. 1-5, diam. 3 mm. 
Hab. Burunga, Mount Mikeno, Belgian Congo, at an altitude 
of 6000 feet. (Robin Kemp.) 
In form much resembling the species of the genus inhabiting 
West Africa. 
TROCHOZONITES KEMPI, sp. nu. (PI. II. fig. 22.) 
Shell moderately small, conic, with very laterally compressed 
spire, in dead condition yellowish grey, somewhat iridescent, 
polished, shining; whorls 64, the first three and a half convex, 
the remainder flattened, sloping, the last acutely carinate at the 
periphery, sculptured with closely-set, oblique, transverse strive ; 
suture linear, very narrowly margined above; base of shell 
slightly convex; umbilicus narrow, deep; columella somewhat 
outwardly expanded, obliquely descending; labrum simple ; 
aperture curvedly subrectangular. 
Alt. 5:25, diam. maj. 6°75, diam. min. 6°5 mm. 
Aperture: alt. 2, diam. 3 mm. 
Hab. Buhamba, near Lake Kivu, Belgian Congo. (Robin 
Kemp.) 
TROCHOZONITES SUTURALIS, sp.n. (PI. II. fig. 24.) 
Shell rimate, turritely turbinate, somewhat laterally compressed 
below, thin, olivaceous; whorls 61, regularly increasing, smooth 
but for very oblique, transverse growth-lines ; suture impressed, 
bearing, especially on the lower part of the shell, an erect, soine- 
what callously thickened ridge, which appears as a carina on the 
last whorl; perforation very narrow, almost concealed by the 
exceedingly narrow outward reflexion of the columella ; columella 
thickened, outwardly reflexed and vertically descending above, 
obliquely descending below, very slightly inwardly bulging in the 
