Freshwater- Shells from Central Africa . 161 
Gibbus ( Gonidomus ) breviculus . (PI. VI. fig. 3.) 
Testa ovata, clauso-rimata, solidiuscula, viridi-flavescens ; anfract. 
6-7, convexiusculi, costulis graeilibus, confertis, obliquis, arcua- 
tis, instructi, sutura crenulata, fere horizontali sejuncti, ultimus 
antice vix descendens ; spira brevis, convexa, ad apicem laevem 
obtusa ; apertura antice contracta, intus pallide lilacea, longit. 
totius vix aequans ; perist. album, leviter incrassatum, anguste 
reflexum, marginibus callo tenui, tuberculo obsoleto prope 
labrum munito, junctis. 
Longit. 14 millim., diam. 9| ; apertura 5 longa, 4T lata. 
Hab. Usagara (Sir J. KirJc ) . 
A short stumpy species, with the aperture considerably 
receding in front, so that, viewed laterally, the labrum is very 
oblique. 
Ennea Hanningtoni . (PL VI. fig. 4.) 
Testa pupiformis, cylindracea, perforata, albo-straminea, polita, hie 
illic linea obliqua olivacea picta ; spira ad apicem rotundata ; 
anfract. 8, lente crescentes, superiores convexiusculi, tres ultimi 
planiusculi, sutura angustissima canaliculata discreti, ultimus 
haud ascendens, pone labrum scrobiculatus ; apertura parva, 
rotunde subtriangularis, longit. totius | paulo superans ; perist. 
album, incrassatum et reflexum, dentibus sex, albis, inaequalibus 
munitum. 
Longit. 10 millim., diam. 5 ; apertura 3 longa et lata. 
Hab . Usagara (Hanning ton and Kirk) ; Mamboia, at an 
elevation of 4000 to 5000 feet {Last). 
This is a smooth glossy species like E. laevigata , Dohrn, 
but rather more slender and with different teeth in the mouth. 
There are three small ones on the outer lip, a fourth of the 
same size at the lower part of the columella, a large, very 
prominent one at the upper part, and a large lamellar one 
close to the termination of the labrum. The teeth on the 
outer lip and at the lower part of the columella are indicated 
externally by slight indentations. 
Ennea Newtoni . (PL VI. fig. 5.) 
Testa ovata, pupiformis, haud rimata, polita, subpellucida, pallido 
cornea, hie illic linea olivacea picta ; anfract. 8, parum convexi, 
supra anguste marginati, oblique striatuli, striis pone labrum 
validis, ultimus antice subascendens ; apertura quinquedentata, 
mediocris, longit. totius adaequans ; perist. album, leviter ex- 
pansum et reflexum ; columella intus lata. 
Longit. 11 millim., diam. 5 § ; apertura 3| longa, 3 lata. 
