Family Sebdeniaceae. Sebdenia Berth. A genus widely distributed in the warmer seas of the Pacific and Indian Oceans. Sebdenia (?) sp. Toni et Forti (1923), p. 31, have identified a seaweed collected at Port Chalmers as S. (?) callymenioides. What it really is I don't know; but it is certainly not Halymenia callymenioides Harv., Trans, Irish Acad., vol. 22, p. 56, as suggested. The plant originally described by Harvey under this name was later confused by him with another species, and redescribed and figured as H. cliftoni. H. cliftoni is now Leptosomia cliftoni (Harv.) J. Ag., v. Kylin (1931), p. 19; but the original plant of Harvey was probably a true Halymenia (v. Kylin, loc. cit.). The Port Chalmers plant, whatever it may be, is, therefore, not entitled to the specific name callymenioides, as it is evidently not a Halymenia. Family Gracilariaceae. Curdiaea Harv. In Australasian Seas. Curdiaea coriacea (Harv. f. et Harv.) J. Ag. (1876), p. 401. Comparatively common along the East Coast from Stewart Island, as far north as Lyall's Bay, usually in the D'Urvillea belt. Endemic. Curdiaea crateriformis (J. Ag.) Kylin (1932), p. 61. (= Sarcocladia (?) crateriformis J. Ag. (1876), p. 697.) Hokianga and Bay of Islands, Berggren; O'Neil's Point, L. M. C.; Bay of Islands, V. W. L. (N.). Probably endemic. Curdiaea engelhartii J.Ag. (1901), p. 105. East coast of both islands, as far north as the Bay of Islands; not common. Akatore is the type locality. Australia. Curdiaea laciniata Harv. (1856), Ann. Nat. Hist., ser. 2, vol. 15, p. 333. Bay of Islands, Cook Strait, Lyall; Otago, Lindsay. I have seen no N.Z. specimens, and doubt the occurrence of this in N.Z. Quite possibly one of the other species of the genus may have been confused with it. Apparently it was not collected by Berggren. Australia, Tasmania.