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Show 1899.] FROM BRITISH CENTRAL AFRICA. 583 scopicis sculpta; spira parum elata, subconvexe conoidea; anfractus 5|, lente accrescentes, convexiusculi, infra suturam anguste marginati ; apertura oblique lunata, margine columellari superne breviter dilatato et refiexo. Diam. mag. 7 | millim., min. 6|, alt. 4. Hab. Mount Chiradzulu. Flatter than T. hanningtoni, columella more oblique and reflexion different. 13. THAPSIA INSIMULANS, sp. nov. (Plate XXXIII. figs. 16, 17, 18.) Testa minima, fusco-cornea, nitida, depressa, orbicularis,perforata, lineis incrementi tenuibus striisque spiralibus minutis sculpta spira brevissime conoidea, ad apicem obtusa ; anfractus 4|, lente accrescentes, convexiusculi, anguste marginati, ultimus infra spiraliter disiinctius striatus; peristoma tenue, margine columellari leviter expanso, vix refiexo. Diam. mag. 5 millim., min. 4|, alt. 3. Hab. Mount Chiradzulu. Quite distinct from T. hanningtoni and T. depressior Smith l from Mamboia. 14. THAPSIA MASUKUENSIS, sp. nov. (Plate XXXIII. figs. 19, 20.) Testa angustissime semiobtecte perforata, depressa, orbicularis^ tenuis, polita, fusco-cornea ; spira breviter conoidea ad apicem obtusa ; anfractus ok, convexi, lente crescentes, anguste marginati apertura obliqua, lunata ; peristoma tenue, margine columellari ad insertionem incrassato, albo, expanso, peculiariter refiexo, umbilicum semiobtegente. Diam. mag. 9 millim., min. 7§, alt. 5|. Hab. Masuku Plateau, 6000-7000 feet. The sculpture consists of faint lines of growth which are finely plicate near the suture, and very minute, almost imperceptible spiral striation. 15. THAPSIA SIMULATA, sp. nov. (Plate XXXIII. figs. 21, 22, 23.) Testa depressa, orbicularis, anguste umbilicata, solidiuscula, nitida, supra fuscescens, infra pallida ; spira brevissime conoidea, ad apicem obtusa ; anfractus 5, convexi, infra suturam impresse marginati, sublente crescentes, lineis incrementi obliquis arcuatis leviter striati, ultimus ad peripheriam rotundatus; apertura oblique lunata; peristoma tenue, margine columellari ad insertionem late dilatato et refiexo. Diam. maj. 11| millim., min. 10, alt. 7. Hab. Mount Chiradzulu. More solid and more depressed than T. nyikana, with a wider umbilicus, and smaller aperture and body-whorl. Ann. Mag. Nat. Hist. 1890, vol. vi. p. 151. 38* |