SPECIES OF ZONITIDE FROM EQUATORIAL AFRICA, 809 
FALLOONELLA, gen. nov. 
Shell depressed or depressedly conoid, perforate, closely and 
almost laminiferously striate above, polished on the base, suturally 
callously margined, and carinate at the periphery. 
Genotype: /. exquisita Preston. 
FALLOONELLA EXQUISITA, sp. n. (PI. I. figs. 9, 9 a, 96.) 
Shell depressedly turbinate, suborbicular, thin, somewhat 
diaphanous and shining, chestnut-coloured ; sino 5 1, the earlier 
whorls smooth, the later whorls sculptured with moderately fine 
and very closely-set, oblique, arcuate costule; suture bearing a 
sulcate raised ridge, which appears on the last whorl asa yellowish 
raised peripheral carina; base of shell polished, shining, showing 
radiate growth-ridges and sculptured only with very fine, wavy, 
and closely-set revolving striz; umbilical area greenish olive, 
the perforation being deep and very narrow ; columella oblique, 
somewhat curved, very narrowly outwardly expanded above, and 
diffusing into a thin, minutely granular, outwardly spreading, 
well-defined callus, which reaches the upper margin of the labrum ; 
labrum simple, acute ; ; aperture obliquely and somewhat br oadly 
sublunate. 
Alt. 5, diam. maj. 9°75, diam. min. 8°75 mm, 
Aperture: alt. 4:25, diam. 4°5 mm. 
Hab. Urguess, British Kast Africa. (A. Blayney Percival.) 
FALLOONELLA EXQUISITA GUDEI, subsp. n. (PI. I. fig. 10.) 
Shell differing from typical /. exquisita Preston in having one 
whorl more, in its less depressed form, rather finer cblique 
costule on the spire, and in the sutural ridge which is also con- 
siderably finer, the perforation is rather less narrow, the columella 
is less curved and more oblique, and the aperture is rather 
narrower in proportion to its height. 
Alt. 6°75, diam. maj. 11 (nearly), diam. min. 9°75 mm. 
Aperture: alt. 5°25, diam. 5 mm. 
Hab. Larogi Hills, British Hast Africa. (A. Blayney Percival.) 
FALLOONELLA LAROGIENSIS, sp.n. (PI. I. figs. lla, 116.) 
Shell perforate, depressedly turbinate, dark livid flesh-colour 
above, covered with a chestnut periostracum ; whorls 54, flattish, 
regularly, but not rapidly, increasing, the ‘first two and a half 
spirally sulcate, the remainder sculptured with moderately coarse, 
not very resular, but wavy, oblique, transverse riblets, presenting 
through a lens a slightly corrugated appearance ; suture lightly 
impressed, bearing a somewhat coarse, thread-like, cream-coloured 
ridge, which appears as a rather sharp peripheral carina on the 
last whorl; base of shell slightly polished, whitish yellow, sculp- 
tured with distant, revolving, microscopic, scratch-like striz ; 
erforation narrow, deep; columella triangularly, outwardly ex- 
panded above, obliquely descending in a slight curve; labrum 
