PAL.EONTOGRAPHICAL society. VOL. LXXI THE WEALDEN AND PURBECK FISHES. Part III. Pages i— viii, 105—148; Plates XXI—XXVI. Title-page and Index. THE PLIOCENE MOLLUSCA. Part IV. Pages i — xii, 463—483. Title-page and Index to Vol. I. THE PALEOZOIC ASTEROZOA. Part IV. Pages 169—196. THE CAMBRrAN TRILOBITES. Part V. Pages 89—120; Plates XI- XIV. Issued for 1917. (jftfiJoKnia ^fcaf/emu oJ cfcieneed RECEIVED BY PURCHASE 2. I go 9- Digitized by the Internet Archive in 2011 with funding from California Academy of Sciences Library http://www.archive.org/details/monographofbriti04spen PALEONTOGMPHICAL SOCIETY. VOLUME LXXI. CONTAINING 1. THE WEALDEN AND PURBECK FISHES. Part III. By Dr. A. S. Woodward. Six Plates. 2. THE PLIOCENE MOLLUSCA. Part IV. By Mr. F. W. Harmer. Title-page and Index to Vol. I. 3. THE PALAEOZOIC ASTEROZOA. Part IV. By Dr. W. K. Spencer. Twenty-six Text-figures. 4. THE CAMBRIAN TRILOBITES. Part V. By Mr. P. Lake. Four Plates. ISSUED FOR 1917. ^ •> LONDON: PRINTED FOR THE PAL^EONTOGRAPHICAL SOCIETY. AGENTS FOR THE SOCIETY DULAU AND CO., LTD., 34-36, MARGARET STREET, W. 1. APRIL, 1919. THE PAL^EONTOGRAPHICAL SOCIETY was established in the year L847, for the purpose of figuring and describing British Fossils. Each person subscribing One Guinea is considered a Member of the Society, and is entitled to lite Volume issued for the Year to which the Subscription relates. The price of the Volume to Non-subscribers is Twenty-five Shillings net. Subscriptions are considered to be due on the 1st of January in each year. The Annual Volumes are now issued in two forms of Binding : 1st, with all the Monographs stitched together and enclosed in one cover ; 2nd, with each of the Monographs in a paper cover, and the whole of the separate parts enclosed in an envelope. Members wishing to obtain the Volume arranged in the latter form are requested to communicate with the Secretary. Most of the back volumes are in stock. Monographs or parts of Monographs already published can be obtained, apart from the annual volumes, from Messrs. Dulau and Co., Ltd., 34-36, Margaret Street, London, W. 1, who will forward a complete price list on application. Members desirous of forwarding the objects of the Society can be provided with plates and circulars for distribution on application to the Secretary, Dr. A. Smith Woodward, British Museum (Nat. Hist.), South Kensington, London, S.W. 7. The following Monographs are in course of preparation and publication : The Cambrian Trilobites, by Mr. Philip Lake. The Palaeozoic Asterozoa, by Dr. W. K. Spencer. The Ordovician and Silurian Mollusca, by Dr. Wheelton Hind. The British Bellerophontacea, by Dr. F. R. Cowper Reed. The Pliocene Mollusca, by Mr. F. W. Harmer. The Pleistocene Mammalia, by Prof. S. H. Reynolds s Owing to scarcity of paper, the Council has decided to omit from the present volume the usual lists of members and publications. Full particulars can be. obtained from the Secretary. Members deceased during 1917: Dr. C. T. Clough, Sir Charles Holcroft, E. J. Power, Esq., and Miss A. F. Yule. New member: Dr. Wyatt Wingrave, ANNUAL REPORT OF THE COUNCIL FOR THE YEAR ENDING 31st DECEMBER, 1916. BEAD AND ADOPTED AT THE ANNUAL GENERAL MEETING, HELD AT THE APARTMENTS OF THE GEOLOGICAL SOCIETY, BURLINGTON HOUSE 30th MARCH, 1917. Dr. HENRY WOODWARD, F.R.S., President, IN THE CHAIR. The Council in presenting its Seventieth Annual Report, regrets that, owing to the various difficulties of existing circumstances, its publications still remain in arrear. Palseontological research continues to make progress, and there is no lack of offers of Monographs to the Society ; but authors are hindered by many draw- backs, and the increased cost of publication necessarily reduces the amount of the annual issue. The volume for 1915, which was ready for distribution in October, 1916, contains another instalment of Mr. W. K. Spencer's Monograph of "Palaeozoic Asterozoa," with four plates, and the first part of a Monograph of " Wealden and Purbeck Fishes," by Dr. A. Smith Woodward, with ten plates. The volume for 1916 is planned to contain instalments of the Monographs of "Pliocene Mollusca," " Paleeozoic Asterozoa," " Cambrian Trilobites," " British Graptolites," and " Wealden and Purbeck Fishes," altogether with twenty-six plates. The delay in the publications again increased the balance at the bank, and the Council resolved, from patriotic motives, to invest £400 in Exchequer Bonds, 1920, bearing interest at 6 per cent. Among members who have died during the year, the Council desires especially to refer to Mr. C. T. Clough, Mr. Bedford McNeill, Mr. Clement Reid, and Miss A. F. Yule. These were all valued supporters of the Society, and Mr. Clement Reid had not only served on the Council but had also contributed an index to the Monograph of the " Devonian Fauna " by the Rev. G. F. Whidborne. To replace the losses sustained, the Council would welcome the help and personal influence of the membei's in making the work and needs of the Society more widely known among those who are interested in the study of fossils. It would also appreciate the more sympathetic co-operation of the various Field Clubs and Natural History Societies. The thanks of the Society are due to the Council of the Geological Society for permission both to store the stock of back volumes, and to hold the Council Meetings and Annual General Meeting in their apartments. In conclusion, it is proposed that the retiring members of the Council be Dr. Kitchin, Mr. Oke, and Dr. Strahan ; that the new members be Mr. H. A. Allen, Mr. E. Heron- Allen, Rev. H. N. Hutchinson, and Dr. C. T. Trechmann ; that the President be Dr. Henry Woodward ; the Treasurer, Mr. Robert S. Herries ; and the Secretary, Dr. A. Smith Woodward. Annexed is the Balance-sheet. 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T. Newton, Esq., F.R.S. tantil. H. A. Allen, Esq., F.G.S. John Hopkinson, Esq., F.L.S., F.G.S. C. W. Andrews, Esq., D.Sc, F.R.S. Rev. H. N. Hutchinson, M.A., F.G.S. G. Barrow, Esq., F.G.S. Miss M. S. Johnston. Miss M. C. Crosfield. C. T. Trechmann, Esq., D.Sc, F.G.S. H. Dewey, Esq., F.G.S. S. Hazzledine Warren, Esq., F.G.S. Walcot Gibson, Esq., D.Sc, F.G.S. Prof. W. W. Watts, LL.D., F.R.S. Herbert L.