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Show 216 MR. CRAVEN ON SHELLS FROM USAMBARA. [Mar. 16, Dimensions:-Length 5*6 millims., diameter of last whorl 2, height of aperture 1*2, breadth of aperture 1. Locality. Nossi-Be Island, in coffee-plantations. PALUDINA COLBEAUI, sp. nov. (Plate XXII. fig. 5.) Shell turbinate, perforate, opaque, dark greenish black, coarsely striated by the lines of growth; apex obtuse, spire acuminate; whorls 6, very convex, the last occupying about two thirds of the entire shell, the upper ones tabulated; interior of shell of a pale neutral tint; labrum thin, simple, of a brown colour; columella arcuate and somewhat reflexed over the umbilicus ; basal margin of the aperture slightly effuse and angular; umbilicus small but well defined; suture simple. Operculum corneous, black, pyriform and concentrical; nucleus subcentral. Dimensions:-Length 11 millims., diameter of last whorl 6, height of aperture 5*5, breadth of aperture 4. Locality. Nossi-Be Island, in a sluggish stream running through coffee-plantations. I name this species after m y friend M . Jules Colbeau, of the Societe Malacologique de Belgique. 3. O n a Collection of Land and Freshwater Shells made during a short Expedition to the Usambara Country in Eastern Africa, with Descriptions of seven n e w Species. B y A L F R E D E . C R A V E N , F.R.G.S., F.L.S., F.G.S., F.Z.S., &c. [Eeceived March 1, 1880.] (Plate XXII.) HELIX MOZAMBICENSIS, Pfr. P. Z. S. 1855, p. 91, pl. 31. fig. 9. Very plentiful at Pangani, Marongo, and Magila. HELIX USAMBARICA, sp. nov. (Plate XXII. fig. 6.) Shell depressedly turbinate, umbilicate; apex obtuse, spire depressed ; whorls 6, gradually increasing ; the upper ones rather convex and the last very convexedly rounded and not descending; the two apical whorls smooth, the next three obliquely and the last flexuously lirate ; epidermis very glossy, of a rich brown above, and of a paler brown beneath ; shell beneath epidermis nearly white ; interior of shell of a pale purplish white; aperture semilunar, as broad as high ; labrum thickened and slightly reflexed ; columella somewhat straightened obliquely; suture deep and well marked; umbilicus very deep and large. The young shells are very thin, glossy and transparent. |