Freshioater- Shells from Central Africa. 161 



Gibbits {Gonidomiis) hreviculus. (PI. VI. fig. 3.) 



Testa ovata, claiiso-rimata, solidiuscula, viridi-flavcscens ; anfract. 

 6-7, convexiusculi, costulis gracilibus, confortis, obliqiiis, arcua- 

 tis, instructi, siitura erenulata, fere horizontali sejuncti, ultiimis 

 antice vix descendens ; spira brcvis, convexa, ad apicem la?vem 

 obtusa ; apertura antico contracta, intus pallide lilacea, lougit. 

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

 reflcxum, marginibus callo tenui, tuberculo obsolete prope 

 labrum munito, junctis. 



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



Ilah. 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, eylindracea, perforata, albo-straminea, polita, hio 

 iLlic iinea obliqua olivacea picta ; spira ad apicem rotundata ; 

 anfraf^t. S, lente crescentes, superiores couvexiiisculi, tros ultimi 

 plaiiiusculi, sutura angustissima canaliculata discreti, ultimus 

 baud ascendens, pone labrum scrobiculatus ; apertura parva, 

 rotunde subtriangularis, longit. totius \ paulo superans ; perist. 

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

 munitum. 



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



Hah. Usagara {Hannington and Kirk) ; Mamboia, at an 

 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 upj)er 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. (PI. VI. fig. 5.) 



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

 cornea, hie illic linca olivacea picta ; anfract. 8, parum convexi, 

 supra anguste margiiiati, oblique striatuli, striis pone labrum 

 validis, ultimus antice subascendens ; apertura quinquedentata, 

 mediocris, longit. totius i adoequans ; perist. album, leviter ex- 

 pansum et reiiexura ; columella intus lata. 



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



