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Show 1880.] MR. CRAVEN ON SHELLS FROM SOUTH AFRICA. 619 ENNEA NATALENSIS, sp. nov. (Plate LVII. fig. 7.) Shell elliptically conical, subperforate, semitransparent, pale yellowish green, rather glossy, finely and indistinctly obliquely costulated, excepting near the suture ; the base of last whorl regularly lirate ; suture moderately distinct, coarsely crenulated between the last three whorls ; whorls 8J, scarcely convex, very gradually increasing till the last one, which occupies about two fifths of the entire shell, apex very obtuse; aperture angularly semioval; paries furnished with a thin, short, curved lamella, placed near the outer lip, but not contiguous to it; outer lip armed with a small tooth near the centre; columella furnished with two small teeth, one near the centre and one near the base; peristome somewhat expanded and reflexed. Length 9 millims., greatest diameter 5, diameter of aperture 2\. Locality. Two specimens fouud near the lighthouse at the entrance of Durham Harbour, Port Natal. CtfCLOTUS ALABASTRIS, sp. nov. (Plate LVII. fig. 9.) Shell depressed, discoid, widely umbilicate, semitransparent, of a pure white colour, rather glossy, vitreous, faintly obliquely striated ; spire but little raised; apex moniliform, raised suddenly above the penultimate whorl; umbilicus very large, perspective, exposing all the whorls; whorls 4 \, very convex, the last descending considerably; suture deep and well defined ; aperture obliquely circular ; peristome simple, continuous. Greatest diameter 5*7 millims., least diameter 4*8, diameter of aperture 1*6, height from base of aperture to apex 3. Locality. Cape Recif, entrance of Algoa Bay. HELIX GLOBOSUS, Miill. (Verm. ii. p. 68. no. 264). I must also mention having found a fully developed sinistral specimen of this species in company with immense numbers of the normal dextral form on Robben Island in Table Bay, Cape Colony. EXPLANATION OF PLATE LVIL Fig. 1. Achatina smithii, p. 617. 2. a, b. Helix symmetrica, p. 614. '!. a, b. Vitrina transvaalensis, p. 615. 4. a, b. vandenbroeckii, p. 615. 5. a-c. Ennea, crassilabris, p. 616. 6. a-c. infans, p. 616. 7. a-c. natalensis, p. 619. 8. a-c. Pupa sinistrorsa, p. 618. 9. a, b. Cyclotus alabastris, p. 619. 10. a, b. Physa lirata, p. 617. 11. a, b. Ancylus transvaalensis, p. 617. 12. a-d, Corbicula oliphantensis 618. 41* |