CAMBRIDGE BIOLOGICAL SERIES FOSSIL PLANTS CAMBRIDGE UNIVERSITY PRESS C. F. CLAY, +Manager+ =London=: FETTER LANE, E.C. =Edinburgh=: 100 PRINCES STREET [Illustration] =London=: H. K. LEWIS AND CO. +Ltd.+, 136, GOWER STREET, W.C. =London=: WILLIAM WESLEY AND SON, 28, ESSEX STREET, STRAND =New York=: G. P. PUTNAM’S SONS =Bombay, Calcutta and Madras=: MACMILLAN AND CO., +Ltd.+ =Toronto=: J. M. DENT AND SONS, +Ltd.+ =Tokyo=: THE MARUZEN-KABUSHIKI-KAISHA _All rights reserved_ [Illustration: CHARLES RENÉ ZEILLER Membre de l’Institut Inspecteur général des Mines Professeur à l’École Natˡᵉ Supérieure des Mines (1847–1915)] FOSSIL PLANTS A TEXT-BOOK FOR STUDENTS OF BOTANY AND GEOLOGY BY A. C. SEWARD M.A., F.R.S., +Hon. Sc.D. Dublin+ PROFESSOR OF BOTANY IN THE UNIVERSITY; MASTER OF DOWNING COLLEGE AND HONORARY FELLOW OF EMMANUEL COLLEGE, CAMBRIDGE WITH 253 ILLUSTRATIONS VOLUME III PTERIDOSPERMEAE, CYCADOFILICES, CORDAITALES, CYCADOPHYTA CAMBRIDGE: AT THE UNIVERSITY PRESS 1917 TO THE MEMORY OF MY FRIEND CHARLES RENÉ ZEILLER ILLUSTRIOUS AS A MAN OF SCIENCE AND A NOBLE-HEARTED GENTLEMAN WHOM TO KNOW WAS TO REVERE PREFACE