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Show 20 MR. G. F. ANGAS ON NEW AUSTRALIAN SHELLS. [J pressed ; aperture ovate ; outer lip thin ; columella nearly straight, white, with a narrow dark brown band behind. Length 8 lines, breadth 4 lines. Hab. Sinclair's Range, King George's Sound. This pretty species belongs to the same natural group as B. angasiana, Pf., B. baconi, Benson, and B. mastersi, Cox, all from the S.W. region of the Australian continent. 29. CORBULA VENUSTA, n. sp. (Plate I. fig. 29.) Shell triangularly ovate, solid, rather ventricose, inequivalve, irregularly rugosely plicately concentrically striated, the strise finer and more even towards the umboes, white, beneath a thin yellowish epidermis, with a short carnelion-coloured ray at the anterior side of the umbones ; umbones tumid, approximating ; umbonal ridge strong and angulate; anterior side rounded; posterior side narrowed and sub-truncate. Length 6 lines, alt. 4, lat. 3 lines. Hab. Dredged on the "Sow and Pigs" bank, Port Jackson. The only other species of the genus distinguished by the red umbonal ray is, as far as I am aware, C. marmorata, Hinds, which is a very much smaller shell, quite smooth, and comes from the west coast of Veragua. 30. NE_ERA (LEPTOMYA) PURA, n. sp. (Plate I. fig. 30.) Shell thin, semitransparent, white, subovate, rather convex, equilateral, equivalve, ornamented with rather distant concentric raised lines ; umbones tumid, rather prominent, approximating; anterior side rounded, posterior side obliquely truncate ; ventral margin arcuate, slightly sinuate posteriorly ; umbonal ridge distinctly angulate. Length 6 lines, alt. 5, lat. 3 lines. Hab. Lane Cove, Port Jackson, New S. Wales; in sandy mud (Brazier). 31. MACTRA (SPISULA) FLUVIATILIS, n. sp. (Plate I. fig. 31.) Shell elongately ovate, rather compressedly convex, inequilateral, irregularly concentrically very finely ridged, covered with a rusty-brown epidermis; umbones small, submedian; anterior extremity rounded ; posterior extremity somewhat produced and acuminately oval ; ventral margin arcuate. Length 6 lines, alt. 4, lat. 2f lines. Hab. Dredged in brackish water, in 2 fathoms, Hawkesbury River, New S.Wales (Brazier). 32. CRASSATELLA FULVIDA, n. sp. (Plate I. fig. 32.) Shell subtriangularly ovate, inequilateral, rather compressed, yellowish, faintly streaked and mottled with pale orange, concentrically strongly ribbed, the interstices rather wider than the ribs; umbones pointed, rather small, approximate, tinged with orange-red ; dorsal margin laterally rather concave; ventral margin strongly arcuate |