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Show 1877.] MR. G. F. ANGAS ON N E W MARINE SHELLS. 39 shining, white ; whorls 4, convex ; the last large, rounded at the periphery; aperture circular, peritreme continuous, slightly thickened on the columellar margin. Alt. 1 line, breadth 1 line. Hab. Found in shell sand, Botany Bay, N e w South Wales. This little shell differs from Crossea, A. Ad., in the absence of the basal tooth so characteristic of that genus. It will not agree with Putilla, A. Ad., as in the latter genus the peritreme is not continuous ; nor can it be referred either to Microthyca, A. Ad., or Umbonella, A. Ad. I place it provisionally amongst the Trochidee. ETHALIA BRAZIERI, sp. nov. (Plate V. fig. 17.) Shell depressedly orbicular, white, shining, semitransparent, smooth, with numerous fine concentric impressed lines both above and below the sutures and at the base of the last whorl; whorls 3£, rapidly increasing ; suture impressed, with a narrow opaque band; last whorl rounded at the periphery; base slightly excavated ; aperture subcircular ; outer lip thin, arcuate; columella with a moderate callus expanded over the umbilical region. Diam. 2 lines, alt. 1 line. Hab. Shell sand, " Sow and Pigs" reef, Port Jackson (Brazier). MYONIA SINUATA, n. sp. (Plate V. fig. 18.) Shell elongately turreted, thin, semipellucid, white, transversely striated with narrow, equidistant, opaque diaphanous lines, and crossed on the last whorl with extremely delicate longitudinal striae; whorls 8, convex ; sutures channelled ; aperture ovate, angled above, rounded below ; columella arcuate, a little flattened and reflected over the body-whorl; outer lip deeply sinuous above, forming a sharp angle at its junction with the last whorl, rounded and effuse below. Alt. 3i lines, diam. 1^ line. Hab. Dredged on the " Sow and Pigs" bank, Port Jackson (Brazier). Although in this shell the slight plait or twist on the columella is not discernible, it otherwise resembles a Myonia ; and I have therefore placed it in that genus, which belongs to the Acteonidee, rather than with Monoptygma or Menestho. The sinuous outer lip is a remarkable feature in this species. TORNATINA HOFMANI, n. sp. (Plate V. fig. 19.) Shell cylindrical, white, very finely striated by the lines of growth, with a few distant irregular transverse striae discernible towards the lip on the body-whorl; whorls 5£, the upper ones slightly convex, and channelled at the sutures, the last a little shouldered above and very slightly concave in the middle ; apex sharp ; aperture narrow above, dilated below, and rounded at the base ; outer lip thin, arched when viewed laterally, and slightly contracted in the middle ; columella somewhat thickened below, with a small blunt flexuous pro- |