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Show 116 MR. G. F. ANGAS ON NEW AUSTRALIAN SHELLS. [Jan. 24, and extending inwards are concentric waved bands of olive-brown darker at the margin ; lateral areas not raised, divided from the dorsal areas by radiating nodulous ribs, transversely rugosely costate ; dorsal areas finely longitudinally ridged ; mantle brown, variegated with ash-colour and clothed with very minute chaff-like scales. Length 8 lines. Port Jackson (Coll. Angas). 30. TONICIA CARPENTERT, n. s. (Pl. XIII. fig. 30.) Shell ovate, elevately convex, carinated, ashy white, ornamented at the hinder edges of the valves with pale spots, the spaces between which are very dark olive melting into confused bands of a paler hue, which extend nearly across the valves; valves rostrate, undulately concentrically subimbricately sculptured throughout; the lateral areas not raised, but separated from the dorsal areas by an elevated rib; posterior valve strongly gibbous, the umbo almost terminal; mantle-margin brown. Length 9 lines. Port Jackson (Coll. Angas). 31. LEUCOTINA ESTHER, n. s. (Pl. XIII. fig. 31.) Shell ovate, rather solid, scarcely rimate, whitish; whorls five, transversely grooved and crossed with very fine longitudinal lines; aperture oblong-ovate, half the length of the shell ; columella white, straight, parietal fold hardly visible. Length 2\ lines, breadth 1\ line. Port Jackson, deep water (Coll. Angas). 32. CHELIDONURA ADAMSI, n. s. (Pl. XIII. fig. 32.) Head furnished in front with a short silky fringe; mantle terminating behind in two long bifurcate filaments ; foot elevated on each side, embracing the head and mantle, rounded both in front and behind ; colour velvet-black, with a white crescent on the hinder part of the mantle ; the head and the outer edge of the foot are bordered with a line of brilliant blue ; a line of the same colour, bifurcated in front, extends down the back ; and the posterior filaments are ornamented in the middle with a similar line; parallel with these blue lines, and at a short distance from them, are lines of a gold-colour; and spots of the same appear above the white crescent on the back, and at the bifurcation of the posterior filaments. Shell internal, very small, thin, flat, with the right border terminating in a point. Length 2 inches. Found in a rock-pool at low water at Vaucluse Bay, Port Jackson. This species may be identical with the individual alluded to by Quoy as having been met with at the Mauritius among numerous specimens of his Bulla hirundinina, but which was not described by him. I have named it in honour of m y friend Mr. Arthur Adams, the founder of the genus Chelidonura. |