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Show 228 MR. G. F. ANGAS ON AUSTRALIAN MOLLUSCA. [Feb. 14, D. rumphii, Cuvier, Ann. du Museum, v. p. 437, pl. 29. f. 1 ; Rang, Hist. Nat. des Aplysiens, pl. 1. D. callosa, Lam. Anim. sans Vert. prem. edit. f. 62. This common species is widely distributed throughout the Indian and Pacific Oceans. The animal is of a blackish olive-colour, from 7 to 10 inches long, and emits a purple fluid when molested ; the shell internal, flattened, triangular, callous at the apex, and covered with a brown horny epidermis. Height 2 inches, breadth 1 inch 9 lines. Found on sandy mud at low water, especially in the bays of Paramatta River. 266. APLYSIA TIGRINA. Aplysia tigrina, Rang, Hist. Nat. des Aplysiens, pl. 11. Animal olive, mottled with black. Shell internal, thin, horn-colour, oblong, produced, and curved at the apex. Length 1 inch 3 lines, breadth 10 lines. Middle Harbour and Coodgee Bay. 267. SYPHONOTA KERAUDRENI. Aplysia keraudreni, Rang, Hist. Nat. des Aplysiens, pl. 13. A fine, large species ; the animal clouded with olive and grey. Shell yellowish brown, faintly concentrically striated, rather flat, oval, and triangular at the apex. Length 2 inches, breadth 1^ inch. Port Jackson. I have the shells of three other species of Aplysiida; from Port Jackson, none of which appear to have been described ; but not knowing the animals, I hesitate to publish them. Subfam. OPERCULATINJE. 268. OPERCULATUM INDICUM. Umbrella indica, Lam., Chemn. Conch, v. p. 10, pl. 169. f. 1645, 1646. This species, which ranges throughout the Indo-Pacific province, occurring in the Philippines, Mauritius, and other places, is to be met with at very low spring tides amongst the rocks at Cabbage-tree Cove, outside the North Head of Port Jackson, also at Botany Bay. The animal is very large, and of a greenish-yellow colour, having the shell external. Length of a specimen taken in Botany Bay 4 inches. Order NUDIBRANCHIATA. The following species of Naked-gilled Gasteropoda have already been found in Port Jackson and its vicinity :- Fam. DoRiDiDiE. 269. *DORIS VARIABILIS, Angas, Journ. de Conch. 1864 n 44 pl. 4. f. 1. ' *' ' |