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Show 176 MR. G. F. ANGAS ON NEW AUSTRALIAN SHELLS. [Mar. 6, Gen. MYSELLA, Angas. Shell small, thin, equivalve, inequilateral, quadrately cuneate, concentrically striated. Hinge with a small triangular internal cartilage- pit, close to which is a single small, diverging, subcircular, flattened cardinal tooth in one valve, and with two thin short horizontal lateral processes in the other valve. Siphonal inflection none. MYSELLA ANOMALA, n. sp. (Plate XXVI. fig. 22.) Shell somewhat triangularly ovate, compressed towards the base, rather thin, anterior side shortest, white, covered towards the edges with a pale brown epidermis, concentrically very finely and regularly ridged ; dorsal margins nearly straight, anterior side somewhat compressed and subtruncate; posterior side rounded; ventral margin scarcely convex; umbones a little tumid ; beaks small, incurved, approximate. Long. 5, alt. 4, lat. 2 lin. Hab. Shark Island, Port Jackson, in black mud, 12 fathoms (Brazier). CYTHEREA SOPHICE, n. sp. (Plate XXVI. fig. 23.) Shell small, roundly ovate, tumid, moderately solid, irregularly concentrically striated with the lines of growth, shining, white, painted with a narrow longitudinal band of irregular bright-chestnut markings on the anterior side of the valves, and a broader one of larger markings on the posterior side, leaving a white ray in the centre; umbones tinged with yellow and carnation-red; lunule distinct. Long. 6, alt. 5, lat. 4 lines. Hab. Cape Solander, Botany Bay, after an easterly gale (Brazier). The small size, rounded form, and rich colouring of the umbones lead me to consider this shell a distinct species from any of its allies. I have much pleasure in naming it after Mrs. Brazier. LUCINA (CODAKIA) QUADRATA, n. sp. (Plate XXVI. fig. 24.) Shell quadrately ovate, moderately solid, subventricose, very inequilateral, yellowish white, very finely concentrically striated throughout, the striae becoming slightly undulating and scabrous towards the base, where they are crossed on either side by broader radiating flattened ridges; dorsal margin concavely excavated anteriorly, nearly straight and rapidly descending posteriorly ; ventral margin arcuate, rounded in front; umbones acute, incurved, approximate ; dorsal area excavated. Long. 2, alt. 1-|, lat. 1 lin. Hab. Shark Island, Port Jackson. KELLIA SOLIDA, n. sp. (Plate XXVI. fig. 25.). Shell somewhat quadrately ovate, rather tumid, inequilateral, anterior side the shortest, solid, opaque, white, shining, smooth and polished at the umbones, showing irregular concentric lines towards the base; umbones small, distinct, approximate; anterior side |