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Show 1867.] MR. G. F. ANGAS ON AUSTRALIAN MOLLUSCA. 931 Order PECTIN ACEiE. Fam. TRIGONIID^E. 117. TRIGONIA PECTINATA. Trigonia pectinata, Lam. Ann. du Mus. iv. p. 355, pl. 67. Trigonia lamarcki, Gray. This beautiful shell, so remarkable for the brilliant purple, silver, or orange nacre of the interior of its valves, was at one time easily obtained by the dredge on the " Sow and Pigs" bank, in Port Jackson. The wreck of a coal-laden vessel has, however, interfered with its favourite resort, and it is now more difficult to procure than formerly. Length 1 inch 2 lines. The valves both of this species and T. margaritacea, Lam. (from Bass's Straits), are manufactured into elegant brooches and ear-ornaments by the London jewellers. 118. TRIGONIA STRANGEI. Trigonia strangei, A. Adams, P. Z. S. 1852, p. 91. An extremely rare species, at once distinguished by the wart-like nodules which cover the ribs. It was dredged near the entrance to Port-Jackson Heads, in deep water, by the late Mr. Strange, whose name it bears. A few odd valves, much worn, have been washed ashore at Long Bay and on the beach at Wollongong. Length 1|inch. Fam. ARCID^E. Subfam. ARCINGS. 119. BARBATIA FASCIATA. Area fasciata, Reeve, P. Z. S. 1844; Conch. Icon. pl. 15. f. 99. A remarkably flattened species, rust-stained, and with an erect bristly epidermis at the posterior end. Found under stones and in the crevices of rocks at low water. Length 1 inch 9 lines. 120. BARBATIA (ACAR) PUSILLA. Area pusilla, Sow. P. Z. S. 1833. A small whitish species, belonging to the same group as A. divaricata. Common under stones at low water about Watson's Bay and Middle Harbour. Length 6 lines. 121. ANOMALOCARDIA TRAPEZIA. Area trapezia, Desh. Mag. de Zoologie. Area lobata, Reeve, P. Z. S. 1844 ; Conch. Icon. pl. 3. f. 19. This is the common "Mud-cockle" of the colonists. It is found abundantly half buried in the mud in most of the sheltered bays of Port Jackson, at low water, especially in Wooloomooloo and Rush-cutter's Bays, and along the Parramatta River. Length 3 inches. |