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Show 910 MR. G. F. ANGAS ON NEW AUSTRALIAN MOLLUSCA. [Nov. 28, duced, somewhat beaked, obtusely keeled from the umbones ; lateral teeth finely serrated. Long. 7, alt. 5, lat. 3 lines. Hab. Johnson's Bay and Parramatta River, Port Jackson. This species resembles in external appearance the Mactra lateralis of Say, from South Carolina; it is, however, flatter and less sharply keeled, with the posterior dorsal slope longer and straighter, and the umbones closer together, whilst the serrated character of the lateral teeth would alone distinguish it from the American shell. LORIPES ASSIMILIS, n. s. (Pl. XLIV. fig. 8.) Shell somewhat triangularly orbicular, rather inflated, slightly superficially excavated at the anterior side, solid, whitish, concentrically very finely elevately striated throughout; margins crenate ; cartilage in an oblique groove of the hinder hinge-margin. Long. 6, alt. 6, lat. 3 | lines. Hab. New South Wales; and Hobson's Bay, Port Philip. This species differs from In icterica, Reeve, in being more solid and inflated, more strongly concentrically ridged, and in tbe absence of the diverging radiate striae of the latter. MYSIA (FELANIA) ADAMSI, n. s. (Pl. XLIV. fig. 9.) Shell depressly orbicularly elongate, white, shining, covered with a very thin transparent horny epidermis ; concentrically very finely irregularly striated, smooth and polished at the umbones; lunule very small; margins simple. Hinge with two teeth in each valve, one of which is bifid. Long. 6, alt. 6\, lat. 3| lines. Hab. Port Jackson. Dredged in deep water. MYSIA (FELANIA) JACKSONIENSIS, n. s. (Pl. XLIV. fig. 10.) Shell triangularly depressly orbicular, posterior side rounded, anteriorly somewhat obliquely produced, pale rosy flesh-colour, covered with a light-green shining epidermis; umbones produced, approximate ; concentrically finely irregularly striate, the lines of growth strongly impressed at intervals ; interior pinkish. Long. 4, alt. 4|, lat. 2 | lines. Hab. Dredged in deep water in Port Jackson. LEPTON ADAMSI, n. s. (Pl. XLIV. fig. 11.) Shell triangularly ovate, rather convex, inequilateral, milky whife, somewhat transparent, thin, shining; surface of valves finely concentrically striated, and minutely shagreened anteriorly and posteriorly, smooth in the middle; anterior side short, rounded ; posterior side ovate, widely plicate towards the margin; umbones prominent and slightly oblique; superior margin convex; the inferior margin straight. Long. 65, alt. 5, lat. 2f lines. Hab. Port Jackson. |