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Show 1877-] MR. G. F. ANGAS ON NEW MARINE SHELLS. 37 suture being crossed with delicate crescent-shaped descending striae; spire sharp ; aperture elongately ovate; outer lip simple, a little contracted below ; posterior sinus moderate ; canal short, scarcely recurved. Length 1 inch, breadth 4 lines. Hab. Coasts of New South Wales. This species is allied to D. harpularia, Des Moul., from South Australia, but differs from it in having transverse ribs on the lower whorl, and being nodulous at the summits of the longitudinal plicae. The aperture also differs in form. There are specimens of this shell in the British Museum, from New Zealand, which have the ribs and nodulous sculpture more prominent than in the type. There are also 2 examples of a variety of a uniform dull yellow colour. MANGELIA JACKSONENSIS, n. sp. (Plate V. fig. 10.) Shell elongately fusiformly turreted, solid, pale fulvous yellow ; whorls 7, angulated and flattened at the upper part, longitudinally somewhat prominently ribbed, the ribs slightly nodulous at the angle of the whorl, the interstices crossed with narrow grooved lines in pairs, which are interrupted by the longitudinal ribs ; aperture elongately ovate ; outer lip thin, simple; base of columella sometimes tinged with brown ; posterior sinus very shallow. Length 7, breadth 2 lines. Hab. Dredged off Port-Jackson Heads in 25 fathoms (Brazier). MANGELIA FLAVESCENS, n. sp. (Plate V. fig. 11.) Shell ovately fusiformly turreted, solid, pale buff, sometimes tinged with yellowish orange on the ribs ; whorls 6£, conspicuously angled below the sutures and longitudinally distantly stoutly ribbed, the ribs sharply nodulous at the angle, the lower half of the last whorl finely transversely ridged; aperture elongately ovate, outer lip flattened inwards ; posterior sinus moderate, slanting upwards. Alt. 2\ lines, diam. \\ line. Hab. Port Jackson (Brazier). In one specimen the ribs are suffused with orange at the angle. CLATHURELLA BRENCHLEYI, n. sp. (Plate V. fig. 12.) Shell fusiformly turreted, moderately solid, light brown inclining to ash-colour towards the apex ; whorls 8, slightly angulated at the upper part, and somewhat compressed next the sutures, longitudinally more or less prominently ribbed, the ribs crossed with regular elevated ridges, which are less distinct below the sutures, from which descend very fine and close-set crescent-shaped striae as far as the angle of the whorl, crossing the concentric lines; spire sharp, apex dark brown or purple ; aperture elongately ovate, brown within ; outer lip denticulated at the edge, crenate within, and margined with white; posterior sinus broad and shallow; canal short, wide, and recurved. Length 9, breadth 3 lines. Hab Port Stephens, N e w South Wales (Brazier). |