Freshwater -Shells from Central Africa. 161 



Gibhus {Gonidomus) hreviculus, (PI. VI. fig. 3.) 



Testa ovata, clauso-rimata, solidiuscula, viridi-flavescens ; anfract. 

 6-7, convexiusciili, costiilis gracilibus, confertis, obliquis, arcua- 

 tis, instructi, sutura crenulata, fere horizontali sejuncti, ultimus 

 antice vix descendens ; spira brevis, convexa, ad apicem lasvem 

 obtusa ; apertura antice contracta, intus pallide liJacea, lougit. 

 totius ^ vix aequans ; perist. album, leviter incrassatum, anguste 

 reflexum, marginibus callo tenui, tuberculo obsoleto prope 

 labrum muuito, junetis. 



Longit. 14 millim., diam, 9| ; apertura 5 longa, 4i lata. 



Hah. Usagara {^Sir J. Kirk) . 



A short stumpy species, with the aperture considerably 

 receding in front, so that, viewed laterally, the labrum is very 

 oblique. 



Ennea Hanningtoni. (PI. VI. fig. 4.) 



Testa pupiformis, cylindracea, perforata, albo-straminea, polita, hie 

 illic linea obliqua olivacea picta ; spira ad apicem rotundata ; 

 aufract. 8, lente crescente«, superiores convexiusculi, tres ultimi 

 planiusculi, sutura augustissima canaKculata discreti, ultimus 

 haud ascendens, pone labrum scrobiculatus ; apertura parva, 

 rotuude subtriangularis, lougit. totius \ paulo superans ; perist. 

 album, incrassatum et reflexum, dentibus sex, albis, inaequalibus 

 munitum. 



Longit. 10 millim,, diam. 5 ; apertura 3 longa et lata. 



Hah. Usagara (Hannington and Kirk) ; Mamboia, at au 

 elevation of 4000 to 5000 'feet {Last). 



This is a smooth glossy species like E. Icevigata^ 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 Neiotoni. (PI. VI. fig. 5.) 



Testa ovata, pupiformis, haud rimata, polita, subpellucida, pallide 

 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 i adaequans ; perist. album, leviter ex- 

 pansum et reflexum ; columella intus lata. 



Longit. 11 millim. , diam. 5| ; apertura Sj longa, 3 lata. 



