1899.1 FROM BRITISH CENTRAL AFRICA. 585 



ultimus ad peripheriam acute angulatus et carinatus ; apertura 

 oblique angulato-lunata ; peristoma tenue, margine columellari 

 supra late expanse et rejiexo. 

 Diam. maj. 12 millim., min. 10, alt. 7. 

 Hah. Masuku Plateau, 6000-7000 feet. 



More widely unbilicated than M. mozambicensis, less sharply- 

 keeled, much more delicately sculptured above, &c. The lower 

 surface is more glossy than the upper, which has a silky 

 appearance in nicely washed specimens. 



21. Martensia mozambicensis Pfeiffer. 



Helix mozambicensis, Pfr. Proc. Zool. Soc. 1855, p. 91, pi. xxxi. 

 fig. 9; Martens, Weichth. Deutsch-Ost-Afrikas, p. 46, as Martensia 

 (synonymy and references). 



Hah. Masuku Plateau, 6000-7000 feet ; Zomba Plateau, 5000 

 feet ; Nyika Eange, 7000 feet ; Mount Chiradzulu. 



Widely distributed in East Central Africa, and varying in height 

 of spire, strength of sculpture, convexity of whorls, &c. 



22. Phasis (Trachtctstis) ftjsco-cornea, sp. nov. (Plate 

 XXXIII. figs. 35, 36.) 



Testa depressa, orbicularis, mediocriter umbilicata, tenuis, pallide 

 fusco-cornea, epidermide conspicue pilosa induta; spira fere 

 plana, apice vix elato ; anfractus 4|, convexiusculi, sutura pro- 

 funda sejuiicti, sublente accrescentes, rugose striati et punctati, 

 ultimus antice leviter descendens, ad peripheriam obtuse sub- 

 angulatus ; apertura obliqua, late lunata ; peristoma tenue, 

 margine columellari ad insertionem dilatato et leviter rejlexo. 



Diam. maj. 9 millim., min. 7^, alt. 5, 



Hab. Zomba Plateau, 5000 feet. 



The hairs of the periostracum are rather long, and when rubbed 

 off the surface has a rough pitted appearance. 



23. Phasis (Trachtctstis) fusco-olitaoea, sp. nov. (Plate 

 XXXIII. figs. 37, 38.) 



Testa P. f usco-corneae similis, sed minor, fusco-olivacea, angustiu3 

 umbilicata ; anfractibus 4g, minus convexis, sutura minus pro- 

 fundus sejunctis, ultimo vix descendente. 

 Diam. maj. 7 millim., min. 6, alt. 3|. 



Hah. Masuku Plateau, 6000-7000 feet; Nyika Plateau, 7000 feet. 

 When the hairy periostracum is rubbed off, the surface above 

 and below exhibits lines of growth and spiral striation. 



24. Trochozonites sharpei, sp. nov. (Plate XXXIII. 

 fig. 39.) 



Testa elate conica, ad peripheriam carinata, anguste perforata, 

 tenuis, nitida, Jlavescenti-cornea, lineis incrementi tenuibus 

 obliquis sculpta ; spira producta, subconcava, ad apicem obtusa ; 

 anfractus 7g, lente accrescentes, apicales perconvexi, cceteri sensim 

 tnimis rotundati, supra suturam filo-carinati, ultimus in medio 



