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Show 922 MR. G. F. ANGAS O N AUSTRALIAN MOLLUSCA. [NOV. 28, 63. CHIONE (MARCIA) LAEVIGATA. Venus leevigata, Sow. Thes. Conch, p. 103, pl. 159. f. 156-158. Flatter and less beaked than the preceding species, painted with two or three zigzag rays from the umbones, and wanting the characteristic grooving of the posterior dorsal slope. Dredged in mud in Port Jackson and Port Phillip (Hobson's Bay). Length 1^ inch. 64. CALLISTA DISRUPTA. Cytherea disrupta, Sow. Thes. Conch, p. 117, pl. 163. f. 208, 209. A transversely ovate shell, with the dorsal margin arched; smooth, or very finely concentrically striated, yellowish, and painted with purplish-brown zigzag bands and flames. Dredged at Watson's Bay &c. Length 1^ inch. Found also at Moreton Bay, on the banks off Stradbroke Island. 65. CALLISTA RUTILA. Cytherea rutila, Sow. Thes. Conch, p. 116, pl. 163. f. 205. More rounded and larger than the preceding species, smooth, and painted with irregular interrupted bands of chestnut, and tinged with rose-colour round the posterior side and ventral margin. Dredged at Watson's Bay, and found on the beach at Cabbage-tree Cove, outside the north head of Port Jackson. Length 1 inch 9 lines. I have received specimens from the east coast of Tasmania 2 inches 3 lines across. 66. TIVELA UNDULOSA, var. Venus undulosa, Lam. Anim. sans Vert. vi. p. 370. V. variabilis, Sow. P. Z. S. 1835 ; Thes. Conch. Venus, pl. 158. f. 142-146. This species varies considerably in shape and markings. At Swan River, where it is very abundant, the shells are richly rayed and marked with angular and undulating brown lines; occasionally they are white. The Port Jackson specimens, which are of rare occurrence, are smaller, more trigonal, painted sparingly with narrow fulminating lines, and clothed with a thick, silky, fibrous epidermis. Dredged at Watson's Bay. Length 1 inch. 67. *SUNETTA ADELINE. Sunetta adelinee., Angas, antea, p. 909, Pl. XLIV. f. 5. A pretty little species, less tumid than Meroe hians oi Reeve (from Cochin China), with the lunule pinched outwards and projecting. Length 8 lines. Dredged in deep water near Port-Jackson Heads. 68. CIRCE UNDATINA. Cytherea undatina, Lam.; Sow. Thes. Conch. Circe, pl. 138. f. 22-26. A fine species, more ventricose than C. scripta, Linn., and elegantly painted with broad rays, blotches, bands, and zigzag lines of |