DEVONIAN FLOKAS 



A STUDY OF THE ORIGIN OF CORMOPHYTA 



BY 



E. A. NEWELL ARBER, M.A., Sc.D. 



TRINITY COLLEGE, CAMBRIDGE 

 UXIVERSITY DEMONSTRATOR IN PALAEOBOTANY 



WITH A PREFACE BY 

 D. H. SCOTT, M.A., LL.D., Ph.D., F.R.S. 



WITH A FRONTISPIECE AND FORTY-SEVEN 

 FIGURES IN THE TEXT 



NEW YORK 



DOTANICAL 



GARDEN 



CAMBRIDGE 



AT THE UNIVERSITY PRESS 



1921 



