AUTHOR S PREFACE. 



To Dr. I). II. Scott, F.R.S., Professor F. W. Oliver, F.R.S., 

 and Professor Zeiller of Paris, I would express my sincere 

 thanks for valuable suggestions, or other aids. Mr. C. D. 

 Sherborn has rendered me great services in connection with 

 the literature on this flora, and to him I would return my 

 thanks. I am similarly indebted to Mr. B. B. Woodward 

 for assistance in the study of the periodical literature under 

 his charge at the Natural History Museum. 



My thanks are also due to Mr. Holland, F.R.S., Director 

 of the Geological Survey of India, for particulars of the 

 specimens in the Calcutta Museum, and to Mr. W. S. Dun, 

 of the Geological Survey of New South Wales, for valuable 

 information on the subject of the Australian fossils. To 

 Mr. A. G. Hamilton, of New South Wales, I am indebted 

 for the loan of a collection of sections of petrified woods from 

 that colony for comparison with those here described. 



The Council of the Geological Society of London have 

 kindly given me permission to reproduce Text-figs. 12-15 

 from my recent paper in the Quarterly Journal, and to them 

 I would express my thanks. For many of the other text- 

 figures I have drawn largely on the illustrations published 

 by the late Dr. Ottokar Feistmantel, the source in each case 

 being duly acknowledged. 



Lastly, I have to record my thanks to Dr. Smith Woodward, 

 F.R.S., Keeper of the Geological Department, British Museum, 

 for valuable suggestions, and to the Staff of that Departmenl 

 for the kindness with which they have always facilitated 

 my work at the Museum. I would also express my thanks 

 to Miss G. M. Woodward for drawing the illustrations 

 included in this volume. 



E. A. NEWELL ARBER. 



Trinity College, Camhkidge. 

 July, 1905. 



