152 
Mr. E. A. Smith on Land - and 
conical form, very narrow perforation, and the minute spiral 
striation upon the apical whorls, which becomes obsolete on 
the few last. The acute keel at the periphery passes up the 
spire just above the suture, but does not reach beyond the 
fourth volution. The apical whorls are considerably convex 
and probably are not carinate at the middle. The three 
specimens at hand have a dirty appearance, through the 
presence of more or less blackish earth, which appears to be, 
as it were, gummed to the surface. This may possibly be a 
characteristic feature of the species. 
Trochonanina episcopalis . (PI. V. fig. 4.) 
Testa anguste perforata, tenuis, breviter conoidea, ad peripheriam 
subangulata, vel obtuse carinata, pallide fusco-cornea, interdum 
linea angusta rufa supra angulum anfr. ultimi cincta ; anfr. 6-7, 
apicales duo lseves, politi, convexi, cseteri convexiusculi, regula- 
riter accrescentes, striis obliquis curvatis aliisque concentricis 
microscopicis sculpti, quasi subsericati, inferne ad suturam an- 
guste carinato-marginati, ultimus inferne magis politus, lineis con- 
centricis, tenuibus, confertis, minute undulatis, ornatus, lineis 
incrementi radiantibus, tenuibus, sculptus, haud descendens ; 
spira mediocriter elevata, superne submammiformis ; apertura 
oblique semilunata ; perist. tenuissimum, margine columellari ad 
rimam breviter expanso. 
Diam. maj. 17£ millim., min. 15|; alt. 12. 
Hab . Usagara. 
This species is closely related to T . Jenynsi of Pfeiffer, 
but may be distinguished by its colour, the less acute peri- 
phery, and the finer spiral striae on the upper surface. The 
typical form of T. Jenynsi is an opaque white shell with a 
brown zone above the periphery and distinctly spirally striated 
on both the upper and lower surfaces. T . episcopalis is more 
transparent, of a brownish horn- colour, and sculptured on the 
upper surface with excessively fine spiral striation. 
This species was collected by Bishop Hannington, who 
lost his life a few years ago at the hands of some of the 
natives in East Africa. 
Bulimus ( Rhachis ) usagaricus . (PL V. fig. 5.) 
Testa ovato-coniea, anguste perforata, tenuis, albida vel dilute 
flavescens, lineis spiralibus paucis fusco-nigris punctisque nigres- 
centibus sparsis picta ; anfract. 6, convexiusculi, striis incrementi 
tenuibus obliquis, aliisque spiralibus minutis, sculpti, tres api- 
cales plerumque fuscescentes, ultimus magnus, convexus ; aper- 
tura longit. totius \ sequans ; perist. tenue, margine columellari 
superne expanso et reflexo. 
Longit. 1 6| millim., diam. 10 ; apertura 8£ longa, 6 lata. 
