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Show 1880.] MR. CRAVEN ON SHELLS FROM USAMBARA. 219 thin, entire, very slightly reflexed outwardly near the umbilicus umbilicus very large and deep; suture very deep; operculum normal, of a dark-brown colour. Dimensions :-Greatest diameter 12 millims., smallest diameter I0g, height from base of aperture to apex 9, diameter of aperture 5. Locality. Magila, in woods. LANISTES FARLERI, sp. nov. (Plate XXII. fig. 7.) Shell turbinate, sinistral, imperforate, globose; colour varying from olive-green to brownish black, irregularly and coarsely spirally striated and ornamented with numerous spiral bands of various colours, chiefly sienna and purple ; lines of growth very apparent and together with the spiral striae giving the shell a subgranose appearance ; whorls \\ to 5, very convex and somewhat tabulated above ; aperture semilunar ; labrum thin, simple ; columella oblique, with a faint subtruncation near its base; operculum thin, deep brownish black ; muscular scar large. Dimensions :-Greatest diameter 21 millims., smallest diameter 17, height from base of aperture to apex 25, height of aperture 16, breadth of aperture 10. Locality. Magila, exceedingly numerous in a stream of running water. I associate this shell with the name of the Rev. J. Farler, of the Universities Mission station at Magila. MELANIA FERRUGINEA, Lea, P.Z.S. 1850, p. 182; Reeve, Con. Ieon. xxi. sp. 147. Locality. Umba (between Marongo and Magila), in an almost dried up watercourse. MELANTA ZANGUEBARENSIS, Petit, Journ. d. Conch, vol. ii. p. 263, pl. vii. fig. 1. A small variety. Locality. Magila, together with Lanistes farleri; very abundant. EXPLANATION OP PLATE XXII. Fig. 1 a-e. Cyclophorus m.agilensis, p. 218. 2 a-c. Pupa usambarica, p. 218. 3 a, b. Bulimus magilensis, p. 217. 4 a-c. Helix zanguebarica, p. 217. 5 a-e. Paludina colbeaui, p. 216. 6 a-c. Helix usambarica, p. 216. 7 a-d. Lanistes farleri, p. 219. 8 a, b. Achatina mamillata, p. 215. 9 a-c. Achatina kirki, p. 218. 10 a-d. Pupa cafceicola, p. 215. |