Transcriber's Note: Italic text is denoted by _underscores_ and bold text by =equal signs=. All corrections in the ERRATA section below have been made in the text. THE ORNITHOSAURIA: AN ELEMENTARY STUDY OF THE BONES OF PTERODACTYLES. Cambridge: PRINTED BY G. J. CLAY, M.A. AT THE UNIVERSITY PRESS. THE ORNITHOSAURIA: AN ELEMENTARY STUDY OF THE BONES OF PTERODACTYLES, _MADE FROM FOSSIL REMAINS FOUND IN THE CAMBRIDGE UPPER GREENSAND,_ AND ARRANGED IN THE WOODWARDIAN MUSEUM OF THE UNIVERSITY OF CAMBRIDGE BY HARRY GOVIER SEELEY, OF ST. JOHN'S COLLEGE, CAMBRIDGE. _WITH TWELVE PLATES._ "_And when the appointed end comes, they lie not dishonoured in forgetfulness_,"--Xenoph. _Memor._ Book 2, c. 1, § 83. [Illustration: Cambridge:] DEIGHTON, BELL, AND CO. LONDON: BELL AND DALDY. 1870. [_All Rights reserved._] _The expense of printing this volume has been defrayed out of the Funds of the Syndics of the University Press; and Professor Sedgwick hereby expresses his grateful thanks to them for this great favour._ PREFACE. This memoir is a portion of the Catalogue of the Woodwardian Museum which has been made at Professor Sedgwick's request and at his cost. When the Professor laid upon me his commands to prepare a Catalogue of the Museum, it was planned in three distinct works. First, a series of indexes to the specimens in the great divisions into which the Museum is arranged; secondly, a series of memoirs upon the orders and classes of animals concerning which new knowledge is given by fossils in the Museum; and, thirdly, memoirs descriptive of those species contained in the arranged collections which are at present unknown in scientific writings.