152 Mr. E. A. Smith on Land- and 



conical form, very narrow perforation, and the minute spiral 

 striation upon the apical whorls, whicli becomes obsolete on 

 the few last. The acute keel at the periphery passes up the 

 spire just above the suture, but does not reach beyond the 

 fourth volution. The apical whorls are considerably convex 

 and probably are not carinate at the middle. The three 

 specimens at liand have a dirty appearance, through the 

 presence of more or less blackish earth, which appears to be, 

 as it were, gummed to the surface. This may possibly be a 

 characteristic feature of the species. 



Trochonanina episoopalis. (PI. V. fig. 4.) 



Testa anguste perforata, tenuis, breviter conoidea, ad peripheriam 

 subangulata, vel obtuse carinata, pallida fusco-cornea, interdum 

 linea angusta rufa supra angulum anfr. ultimi cincta ; anfr. 6-7, 

 apicales duo Iseves, politi, convexi, cseteri coiivexiusculi, regula- 

 riter accrescentes, striis obliquis curvatis aliisque concentricis 

 microscopieis sculpti, quasi subsericati, inferne ad suturam an- 

 guste carinato-marginati, ultimus inferne magis politus, lineis con- 

 centricis, tenuibus, confertis, minute undulatis, ornatus, lineis 

 incrementi radiantibus, tenuibus, sculptus, baud descendens ; 

 spira mediocriter elevata, superne submammiformis ; apertura 

 oblique semilunata ; perist. tenuissimum, margine columellari ad 

 rimam breviter expanse. 



Diam. maj. 17J millim., min. 15|; alt. 12. 



Hah. Usagara. , 



This species is closely related to T. Jenynsi of Pfeiffer, 

 but may be distinguished by its colour, the less acute peri- 

 phery, and the finer spiral strise on the upper surface. The 

 typical form of T. Jenynsi is an opaque white shell with a 

 brown zone above the periphery and distinctly spirally striated 

 on both the upper and lower surfaces. T. episcojmUs is more 

 transparent, of a brownish horn-colour, and sculptured on the 

 upper surface with excessively fine spiral striation. 



This species was collected by Bishop Hannington, who 

 lost his life a few years ago at the hands of some of the 

 natives in East Africa. 



Bulimus {Rhachi's) usagaricus. (PI. V. fig. 5.) 



Testa ovato-conica, anguste perforata, tenuis, albida vel dilute 

 flavescens, lineis spiralibus paucis fusco-nigris punctisque nigres- 

 contibus sparsis picta ; anfract. 6, convexiusculi, striis incrementi 

 tenuibus obliquis, aliisque spiralibus minutis, sculpti, tres api- 

 cales plerumque fuscescentes, ultimus magnus, convexus ; aper- 

 tura longit. totius | sequans ; perist. tenue, margine columellari 

 superne expanse et reflexo. 



Longit. 16| millim,, diam. 10 ; apertura 8J longa, 6 lata. 



