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 IN THE UNIVERSITY OF SYDNEY, N.S.W. 



IN TWO /VOLUMES 

 VOL. I 



WITH ILLUSTRATIONS 



MACMILLAN AND CO., LIMITED 

 ST. MARTIN'S STREET, LONDON 



