*r 



TREATISE ON ZOOLOGY 



EDITED BY 



E. RAY LANKESTER 



M.A., LL.D., F.R.S. 



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



OF FRANCE I DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS 



OF THE BRITISH MUSEUM 



PART I 



INTKODUCTION AND PEOTOZOA 



SECOND FASCICLE 



BY 



J. B. FARMER, D.Sc., F.R.S. 



PROFESSOR OF BOTANY, ROYAL COLLEGE OF SCIENCE, LONDON 



J. J. LISTER, M.A., F.R.S. 



FELLOW OF ST. JOHN'S COLLEGE, CAMBRIDGE 



E. A. MINCHIN, M.A. 



PROFESSOR OF ZOOLOGY, UNIVERSITY COLLEGE, LONDON 

 AND 



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



PROFESSOR OF ZOOLOGY, OWENS COLLEGE, MANCHESTER 



LONDON 



ADAM & CHAKLES BLACK 

 1903 



