A TEXT-BOOK 

 OF ZOOLOGY 



BY 





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 



PROFESSOR OF BIOLOGY IX THE UNIVERSITY OF SYDNEY, N.S.XV. 



IN TWO VOLUMES 

 VOL. I 



WITH ILLUSTRATIONS 



MACMILLAN AND CO., LIMITED 

 ST. MARTIN'S STREET, LONDON 



1910 



