A TEXT- BOOK 

 OF ZOOLOGY 



BY THE LATE 



T. JEFFERY PARKER, D.Sc., F.R.S. 



PROFESSOR OF BIOLOGY IN THE UNIVERSITY OF OTAGO, DUNEDIN, N.Z. 



AND 



WILLIAM A. HASWELL, M.A., D.Sc., F.R.S. 



EMERITUS PROFESSOR OF BIOLOGY IN T THE UNIVERSITY OF SYDNEY, N.S.W. 



IN TWO VOLUMES 

 VOL. I 



WITH ILLUSTRATIONS 



MACMILLAN AND CO., LIMITED 

 ST. MARTIN'S STREET, LONDON 



1921 



