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Show 1899.1 FROM BRITISH CENTRAL AFRICA. 585 ultimus ad peripheriam acute angulatus et carinatus ; apertura oblique angulato-lunata; peristoma tenue, margine columellari supra late expanso et refiexo. Diam. maj. 12 millim., min. 10, alt. 7. Hab. 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, pl. xxxi. fig. 9; Martens, Weichth. Deutsch-Ost-Afrikas, p. 46, as Martensia (synonymy and references). Hab. Masuku Plateau, 6000-7000 feet; Zomba Plateau, 5000 feet;_ Nyika Range, 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 (TRACHYCYSTIS) FUSCO-CORNEA, sp. nov. (Plate XXXIII. figs. 35, 36.) Testa depressa, orbicularis, mediocriter umbilicata, tenuis, pallide fusco-cornea, epidermide conspicue pilosa incluta; spira fere plana, apice vix elato ; anfractus 4|, convexiusculi, sutura profunda sejuncti, 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 refiexo. 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 (TRACHYCYSTIS) FUSCO-OLIVACEA, sp. noy. (Plate XXXIII. figs. 37, 38.) Testa P. fusco-corneae similis, sed minor, fusco-olivacea, ctngustius umbilicata ; anfractibus 4-J, minus convexis, sutura minus profundus sejunctis, ultimo vix descendente. Diam. maj. 7 millim., min. 6, alt. 3|. Hab. Masuku Plateau, 6000-7000 feet; Nyika Plateau, 7000 feet. W h e n 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, fiavescenti-cornea, lineis incrementi tenuibus obliquis sculpta ; spira producta, subconcava, ad apicem obtusa ; anfractus l\, lente accrescentes, apicales perconvexi, cceteri sensim minus rotundati, supra suturam filo-carinati, ultimus in medio |