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Show 618 MR. CRAVEN ON SHELLS FROM SOUTH AFRICA, [Nov. 30, position of the apex, and the sculpture. In A. coffer the radiate are much more developed, and the apex is recurved so as to overhang the margin, and is about one quarter of the length of the shell from the extremity, whereas in A. transvaalensis it is only a little recurved to one side and is much nearer the centre. CORBICULA OLIPHANTENSIS, sp. nov. (Plate LVII. fig. 12.) Shell subcircularly trigonal, solid, subequilateral, marked with rather fine concentric strias ; epidermis of a greenish yellow colour ; interior of shell nearly white, in young specimens of a beautiful pinkish orange towards the umbones; umbones rather prominent; lateral teeth lamellar, finely serrated, produced; hinge-teeth three on each valve, equidistant. Breadth 12 millims., length 10^, thickness 7\. Locality. Oliphant's River, Transvaal; very plentiful. This shell resembles 0. africana, Krauss, in the dentition of the valves, but differs from that species in its smaller size, finer striae, much paler-coloured epidermis, and different-coloured interior. UNIO CAFFER, Krauss, Siidafr. Moll. p. 18, pl. 1. fig. 14; Reeve, Conch. Icon. pl. 41. sp. 226. A very marked variety of this species occurred to me in the Riet Spruit, near Wynberg, in the Orange Free State, differing from the type in its larger size, much more acuminated posterior, rather rounded basal margin, and thicker hinge-teeth. Breadth 78k millims., length 39, thickness 25. 2. Description of three new Species of Land-Shells from Cape Colony and Natal. Bv A L F R E D E. C R A V E N , F.Z.S., F.L.S., F.R.G.S., &c. [Eeceived October 8, 1SS0.] (Plate LVII.) PUPA (VERTIGO) SINISTRORSA, sp. nov. (Plate LVII. fig. 8.) Shell sinistral, subperforate, ovately conical, of a horny-brown colour, paler near the apex, rather glossy, faintly striated* by the lines of growth; whorls 5J, very convex,'gradually increasing, the last two equal in diameter ; suture deep and well defined ; apertnre nearly circular, armed with four internal teeth, viz. one large tooth situated on the paries near its centre, another smaller tooth on the columella far within the aperture, another at the base of the outer hp, and a very small one at its centre ; labium outwardly reflexed; extremities of peristome connected by a thin callosity. Length 3 to 3f millims., greatest diameter 2, diameter of aperture 1. Locality. Cape Recif, entrance of Algoa Bay : Klein Seties Bosch, near Beautort, Cape Colony. Not very abundant. |
