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THE FROG: 



AN INTRODUCTION TO 



ANATOMY, HISTOLOGY, AND 

 EMBRYOLOGY 



BY THK LATE 



A. MILNES MARSHALL, M.D., D.Sc., M.A., F.R.S., 



FORMERLY FELLOW OF ST. JOHN'S COLLEGE, CAMBRIDGE; PROFESSOR IN THE 



VICTORIA UNIVERSITY ; BEYER PROFESSOR OF ZOOLOGY 



IN OWENS COLLEGE, MANCHESTER. 



EDITED BY 



F. W. GAMBLE, D.Sc, F.R.S. 



MASON PROFESSOR OF ZOOLOGY AND COMPAR/ 

 UNIVERSITY OF BIRMINGHAM 



ELEVENTH EDITION 



MACMILLAN AND CO., LIMITED 



ST. MARTIN'S STREET, LONDON 



1916 



