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Show I I Mil. (J F. ANGAS ON NEW AUSTRALIAN SHELLS. [Jail. 3, 3. COLUMBELLA (MITRELLA) BICINCTA, n. sp. (Plate I. fig. 3.) Shell fusiform, smooth, somewhat thin, of a pale brown colour throughout, with two narrow opaque white bands, irregularly articulated with orange-chestnut spots, situated above and below the margin of the sutures, the second band being in the centre of the last whorl, and with very faint longitudinal zigzag markings here and there, more distinct toward the base; whorls 8 ; sutures impressed ; spire acuminated, longer than the aperture ; aperture elongately ovate, rather short; outer lip sharp at the edge, thickened externally, and somewhat coarsely denticulated within ; inner lip shining, with a few slightly elevated nodules, the edge nearly straight and erect; channel slightly curved aud somewhat produced, transversely striated externally. Length 5 lines, breadth 2 lines. Hab. Port Jackson, dredged near Watson's Bay. -1. COLUMBELLA (MITRELLA) ATTENUATA, n. sp. (Plate I. fig. 4.) Shell acuniinately fusiform, moderately solid, smooth, shining, brown, with a pale band below the sutures; whorls 8, very slightly convex, the last grooved at the base; spire attenuated, blunt at the apex, apical whorls darker; sutures impressed ; aperture small, sub-ovate ; outer lip simple, arcuate, contracted at the base, variced behind, varix dark brown; columella nearly straight, callus slightly reflexed in front; canal short, a little recurved. Length 4 lines, breadth 1 line. Hab. Dredged near the " Sow and Pigs," Port Jackson (Brazier). An elegant little species, distinguished by its very elongated form and its simple bands of light and dark brown. 5. HYALINA (VOLVARINA) MUSTELINA, n. sp. (Plate I. fig. 5.) Shell elongately ovate, light brown, with two grey bands bordered above and below with darker brown; spire short, apex obtuse ; nucleolar whorls edged with dark brown ; base rounded; aperture somewhat narrow; columellar lip a little arcuate below, with four equidistant plaits, the upper one nearly transverse, the others passing obliquely upwards ; outer lip thickened, slightly inflexed, flatly variced behind, cream-coloured, the brown bands passing over the varix, finely dentate at the inner edge with about twenty teeth. Length 2\ lines, breadth 1 line. Hab. Dredged off the " Sow and Pigs," Port Jackson (Brazier). 6. MARGINELLA OCHRACEA, n. sp. (Plate I. fig. 6.) Shell subtriangularly ovate, rather thin, smooth, shining more or less of a pale stiaw-colour, and frequently with a faint orange effuse band next to the suture on the last whorl; whorls 4 ; spire obtusely conical, very blunt at the apex ; aperture rather narrow ; outer lip variced and thickened in the middle, the varix of a paler colour than |