THE MARINE ALGAE OF LORD HOWE ISLAND. By A. H. S. Lucas, M.A., B.Sc. [Read 26th June, 1935.] This account of the sea-weeds of Lord Howe Island is based on observations and collections made by Mrs. F. Perrin and myself druing a stay on the island in the winter of 1933, from 22nd May to 7th July. We were greatly helped by the practical assistance of Mr. Gower Wilson, a leading resident of the island. Mr. Wilson has an intimate knowledge of the shores, reefs and waters, and by aid of his motor launch and rowing boat we were able to make landings on the reef which protects the lagoon, to reach the plants growing in the lagoon itself, and to visit the more distant beaches. He also provided ample space and means for storing and mounting our gatherings. Further material was available in a large collection made by Mr. J. H. Maiden in 1898, preserved in the Herbarium of the Botanic Gardens, Sydney, and in extensive collections made by Mr. R. Baxter, another resident, which came into my hands by the courtesy of Dr. Charles Anderson, Director of the Australian Museum, and of Dr. Darnell Smith, the late Curator of the Sydney Botanic Gardens. Mr. F. A. McNeill and Mr. A. Livingstone added a few more specimens, which they obtained during their explorations of the marine fauna of the island. For the large number of specimens gathered and the rapidity and skill with which they were treated I wish to acknowledge my great indebtedness to the whole-hearted and untiring energy of my colleague, Mrs. Perrin. The Algae of Lord Howe Island. Chlorophtceak Ulva Lactuca L». Caulerpa fastigiata Mont. Enter omorpfia Howensis, n. sp. C. taxifoUa (Vahl) Ag. Chaetomorpha aerea (Dillw. ) Kuetz. C. thujoides J. Ag. Cladophora Goweri, n. sp. (C Brownii Endl. ) Spongocladia vaucheriiformis Aresch. C. racemosa Forsk. Dictyosphaeria favulosa (Mert. ) Dene. C. peltata Lamour. Cladophoropsis Howensis, n. sp. Chlorodestnis major Zan. Valonia Forbesii Harv. Codium Lucasii Setchell. V. confervoides Harv. C spongiosum Harv. V. pachynema (Harv.) von Martens. C. bulbopilum Setch. Acetabularia calyculus Quoy & Gaimard. C. indicum Setch. Bryopsis plumosa (Huds. ) Ag. C. cuneatum Setch. & Gardn. Chlorophyceae. Ulva L. Ulva Lactuca L. Growing in winter (June, July) abundantly on the floor of the lagoon on coral boulders, at the depth of 1 or 2 fathoms. Gower Wilson said that in summer plants of 4 or more inches diameter appear on the rocks bordering the
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