A 



TEEATISE ON ZOOLOGY 



, EDITED BY 



SiR/RAY, LANKESTER 



K.C.B., MA., LL.D., F.R.S. 



HONORARY FELLOW OF EXETER COLLEGE, OXFORD; CORRESPONDENT OF THE INSTITUTE 



OF FRANCE; LATE DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS 



OF THE BRITISH MUSEUM 



PART I 



INTRODUCTION AND PROTOZOA 



FIEST FASCICLE 



BY 



S. J. HICKSON, F.R.S. 



PROFESSOR OF ZOOLOGY, VICTORIA UNIVERSITY OF MANCHESTER 



J. J. LISTER, F.R.S. 



FELLOW OF ST. JOHN'S COLLEGE, CAMBRIDGE 



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



ASSISTANT DIRECTOR OF THE ZOOLOGICAL LABORATORIES, AND 

 LECTURER IN ZOOLOGY, UNIVERSITY OF MANTIIEsTF.il 



A. WILLEY, M.A., D.Sc., F.R.S. 



DIRECTOR OF COI.OMHO MUSEUM, CEYLON 



H. M. WOODCOCK, D.Sc. 



ASSISTANT TO THE PROFESSOR OF PROTOZOOLOGY IN THE UNIVERSITY OK LONDON 



THE LATE W. F. R. WELDON, F.R.S. 



LI NACRE PROFESSOR OF COMPARATIVE ANATOMY, OXFORD 

 AND 



E. RAY LANKESTER, K.C.B., F.R.S. 



LONDON 

 ADAM AND CHAKLES BLACK 



1909 



