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Show 592 ON LAND-SHELLS FROM BRITISH CENTRAL AFRICA. [May 2, spiraliter undique tenuiter lirata lineisque incrementi tenuissimis sculpta ; anfractus 5, convexi, superiores duo Iceves, ultimus antice paulo descendens; apertura subcircularis, longit. totius | superans, intus rufo-fuscescens, zona nigro-purpurea picta, lineis saturate fuscis supra obscure ornata; peristoma albidum, margine dextro vix expanso, columellari subrefiexo. Diam. maj. 21 millim., min. 16, alt. 20 ; apertura 10 longa, 9 lata. Hab. Mount Chiradzulu; Nyika Range, 7000 feet, and Zomba Plateau, 5000 feet. Allied to P. \_Cyclostoma] insularis Pfeiffer from Natal, but more widely umbilicated, with more convex whorls, more numerous and finer spiral lirae, and without the second purplish-black zone upon the upper part of the body-whorl which revolves up the spire. The outer margin of the aperture also is less expanded. EXPLANATION OF THE PLATES. PLATE XXXIII. Figs. 1, 2. Ennea (Gulella) vicina, p. 580. 3, 4. „ „ varians, p. 581. 5, 6. Streptaxis johnstoni, p. 581. 7, 8. „ kirki, p. 582. 9, 10. Helicarion nyasanus, p. 582. 11, 12. „ masukuensis, p. 582. 13, 14, 15. Thapsia mixta, p. 582. 16, 17, 18. „ insimulans, p. 583. 19, 20. ,, masukuensis, p. 583. 21,22,23. „ simulata, p. 583. 24, 25. ,, nyikana, p. 584. 26, 27, 28. „ decepta, p. 584. 29, 30. Zingis johnstoni, p. 584. 31. ,, whytei, p. 584. 32, 33, 34. Martensia consociata, p. 584. 35, 36. Phasis (Trachycystis) fusco-cornea, p. 585. 37,38. „ „ fusco-olivacea, p. 585. 39. Trochozonites sharpei, p. 585. 40. Buliminus (Rhachis) chiradzuluensis, p. 586. 41,42. „ (Conulinus) nyasanus, p. 586. 43. „ „ metuloidcs, p. 587. 44. Curvella nyasana, p. 588. 45. „ whytei, p. 588. 46. Subulina chiradzuluensis, p. 588. PLATE XXXIV. Figs. 1. Achatina pant hor a, p. 589. 2,3. „ ylaucina, p. 590. 4, 5. „ johnstoni, p. 590. PLATE XXXV. Figs. 1, 2. Achatina craveni, p. 590. 3,4. „ fragilis, p. 591. 5. Pomatias nyasanus, p. 591. |