Errata 674 Index 675 Plates 685 THE RAY SOCIETY. INSTITUTED MDCCCXLIV. [Illustration] LONDON. MDCCCLIV. A MONOGRAPH ON THE SUB-CLASS CIRRIPEDIA, WITH FIGURES OF ALL THE SPECIES. BY CHARLES DARWIN, F.R.S., F.G.S. THE BALANIDÆ, (OR SESSILE CIRRIPEDES); THE VERRUCIDÆ, ETC., ETC., ETC. LONDON: PRINTED FOR THE RAY SOCIETY. MDCCCLIV. Reprinted with the permission of the Ray Society JOHNSON REPRINT CORPORATION 111 Fifth Avenue, New York, N. Y. 10003 JOHNSON REPRINT COMPANY LTD. Berkeley Square House, London, W. 1 First reprinting, 1968, Johnson Reprint Corporation Printed in the United States of America TO PROFESSOR H. MILNE EDWARDS, DEAN OF THE FACULTY OF SCIENCES OF PARIS; PROFESSOR AT THE MUSEUM OF NATURAL HISTORY; MEMBER OF THE INSTITUTE OF FRANCE; FOREIGN MEMBER OF THE ROYAL SOCIETY OF LONDON, OF THE ACADEMIES OF BERLIN, STOCKHOLM, ST. PETERSBURG, VIENNA, KONIGSBERG, MOSCOW, BRUSSELS, HAARLEM, BOSTON, PHILADELPHIA, ETC. THIS WORK IS DEDICATED, WITH THE MOST SINCERE RESPECT, AS THE ONLY, THOUGH VERY INADEQUATE ACKNOWLEDGMENT WHICH THE AUTHOR CAN MAKE OF HIS GREAT AND CONTINUED OBLIGATIONS TO THE 'HISTOIRE NATURELLE DES CRUSTACÉS,' AND TO THE OTHER MEMOIRS AND WORKS ON NATURAL HISTORY PUBLISHED BY THIS ILLUSTRIOUS NATURALIST. PREFACE. Having so lately, in my volumes on the Recent and Fossil Lepadidæ, expressed as strongly as I could, and with the utmost sincerity, the obligations under which I lie to very many naturalists, I will not here repeat my thanks, and will only say that the assistance formerly rendered me from so many quarters has been most kindly continued without intermission. The references under the Habitats, in which I may remark the names of Mr. Cuming and of Mr. Stutchbury, and of the British Museum, so often recur, show my deep obligations to these gentlemen and to Dr. Gray, and indeed to most of the British and several Foreign[1] collectors of recent and fossil shells. At the period when the Introduction to this volume was printed, I stated that I did not know whether the Palæontographical Society would publish the few British fossil Balanidæ; the Council has now honoured me by determining on this publication, so that these species will hereafter be more fully illustrated than they could be in the present volume. I cannot conclude this short preface, without again tendering my most grateful thanks to the Council of the Ray Society for the publication of my two volumes, and for the very kind manner in which they have acceded to all my requests. DOWN, KENT; _July, 1854_.