Freshwater- Shells from Central Africa. 157 



In the single specimen from tlic above locality the striaj 

 upon the upper whorls are strongly marked near the suture 

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

 last volution, however, the strite are equally strongly incised 

 all over the surface, being especially distinct near the outer 

 lij). There is a slight depression below the suture in this 

 whorl, but it may only be an individual peculiarity. 



In tliree specimens collected by iSir J. Kirk in Usagara, 

 which are smaller than the type, the striae 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 jdacing them side by side they all appear to 

 belong to the same species. 



Bulimus [Ilapalus) associatus. (PL V. fig. 14.) 



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

 anfract. 6, couvexi, lente accrescentes, etriis fortibus, regularibus, 

 confertis, subhorizontalibus, leviter curvatis, sculpti, sutura paulo 

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

 I ada^quans ; labrum tenuo, leviter arcuatum ; columella leviter 

 contorta, expansa et reflexa, caUo tenui labro juncta. 



Longit. 74 millira., diam. 3.j ; apertura '6 louga, 1| lata. 



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



This species has the sculpture very like that of Hapalus 

 disparilis, but is quite distinct on account of its very diffe- 

 rent form. 



Stenogyra [Siibulina) subcarinifera. (PI. V. fig. 15.) 



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

 fusca ; anfract. 7, primus intortus, sccjuentes duo convcxi, costia 

 oblique curvatis subdistantibus ornati, carter! convcxi, costia 

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

 funda, discreti, ultimus oblotigus, circa medium linea elevata 

 indistiucta cinctus ; spira producta, ad apicem obtusa ; apertura 

 irregulariter pyriformis, longit. totius | subaequans ; labrum 

 tenuc, antice angustissimo expansnm ; columella albida, in medio 

 arcuata, inferne oblique truncata, infra truncaturam sinuata. 



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



Var. major. Testa pallidior, anfr. 8, secundo et tei'tio costis quam iu 

 forma typica magis numerosis. 



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



Hab. 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 



