7 



TREATISE ON ZOOLOGY 



EDITED BY 



SIR- RAY LANKESTER 



K.C.B., M.A., 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 PEOTOZOA 



FIRST 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, CAMBRIDGF, 



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



ASSISTANT DIRECTOR OF THE ZOOLOGICAL LABORATORIES. \M. 

 LECTURER IN ZOOLOGY, UNIVERSITY OF MANCHESTER 



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



DIRECTOR OF COLOMBO MUSEUM, CEYLON 



H. M. WOODCOCK, D.Sc. 



ASSISTANT TO THE PROFESSOR OF PROTOZOOLOGY IN THE UNIVERSITY OF LONDON 



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



LINACRE PROFESSOR OF COMPARATIVE ANATOMY, OXFORD 



AND 



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







LONDON 

 ADAM AND CHARLES BLACK 



1909 





