Freshwater- Shells from Central Africa. 157 



In the single specimen from the above locality the strise 

 upon the upper whorls are strongly marked near the suture 

 above, and become weaker towards the lower part. On the 

 last volution, however, the striee are equally strongly incised 

 all over the surface, being especially distinct near the outer 

 lip. There is a slight depression below the suture in this 

 whorl, but it may only be an individual peculiarity. 



In three specimens collected by Sir J. Kirk in Usagara, 

 which are smaller than the type, the strise are still stronger 

 and continue from suture to suture. They also differ in having 

 the whorls slightly more convex and in being imperforate ; but 

 this may be due to their immaturity. Notwithstanding these 

 differences, on placing them side by side they all appear to 

 belong to the same species. 



Bulimus [Hapalus) associatus. (PI. V. fig. 14.) 



Testa elongata, augusta, vix perforata, nitida, albida, vel cerea ; 

 anfract. 6, convexi, lente accrescentes, striis fortibus, regularibua, 

 coufertis, subhorizontalibus, leviter curvatis, sculpti, sutura paulo 

 obliqua discreti, ultimus parvus ; apertura parva, longit. totius 

 I adaequans ; labrum tenue, leviter arcuatum ; columella leviter 

 contorta, expansa et reflexa, callo tenui labro juncta. 



Longit. 7| millim., diam. 3| ; apertura 3 longa, 1| lata. 



Hah. Maraboia, at an elevation of 4000 to 5000 feet. 



This species has the sculpture very like that of Hapalus 

 disparilisj but is quite distinct on account of its very diffe- 

 rent form. 



Stenogyra [SuhuUna) suhcarinifera. (PI. V. fig. 15.) 



Testa elongata, superne acuminata, imperforata, nitida, olivaceo- 

 fusca ; anfract. 7, primus intortus, sequentes duo convexi, costis 

 oblique curvatis subdistantibus ornati, cajteri convexi, costis 

 tenuioribus, valde confertis, instructi, sutura leviter obliqua, pro- 

 funda, discreti, ultimus oblongus, circa medium linea elevata 

 indistincta cinctus ; spira producta, ad apicem obtusa ; apertura 

 irregulariter pyriformis, longit. totius | subaequans ; labrum 

 tenue, antice angustissime expansum ; columella albida, in medio 

 arcuata, inferne oblique truncata, infra truncaturam sinuata, 



Longit. 16 millim., diam. 7^ ; apertura 6^ longa, 4 lata. 



Var. major. Testa pallidior, anfr. 8, secundo ct tertio costis quam iu 

 forma typica magis numerosis. 



Longit. 18 millim., diam. 8| ; apertura 7 longa, 4^ lata. 



Hah. On the plains within 50 miles of Mamboia; also at 

 ,an elevation of 4000 to 5000 feet {Last). 



The columella is not so suddenly truncate as in typical 

 Ann. (& Mag. N. Hist. Ser. 6. Vol. vi. 12 



