21^8 MR. G. F. ANGAS ON AUSTRALIAN MOLLUSCA. [Feb. 14, 



D. rumphii, Cuvier, Ann. du Museum, v. p. 437, pi. 29. f. 1 ; 

 Rang, Hist. Nat. des Aplysiens, pi. 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, pi. 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, pi. 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 \\ inch. 

 Port Jackson. 



I have the shells of three other species of Aplysiidoi from Port 

 Jackson, none of which appear to have been described ; but not know- 

 iiig the animals, I hesitate to publish them. 



Subfam. Ope rcu latino. 



268. Operculatxjm indicum. 



TJtnbrella indica. Lam., Chemn. Conch, v. p. 10, pi. 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. DoRiDiD.^. 



269. *DoRis variabilis, Angas, Journ. de Conch. 1864, p. 44, 

 pi. 4. f. 1. 



