

MANUAL OF ZOOLOGY 



.FOR THE USE OF STUDENTS 



WITH A GENERAL INTRODUCTION ON THE 

 PRINCIPLES OF ZOOLOGY 



BY 



HENRY ALLEYNE NICHOLSON 



M.D., D.Sc., M.A., PH.D. (Goxx.), F.R.S.E., F.G.S. 



PROFESSOR OF NATURAL HISTORY AND BOTANY IN UNIVERSITY COLLEGE, TORONTO 



FORMERLY LECTURER ON NATURAL HISTORY IN THE MEDICAL SCHOOL 



OF EDINBURGH ; ETC. ETC. 



THIRD EDITION 

 REVISED AND ENLARGED 



WILLIAM BLACKWOOD AND SONS 



EDINBURGH AND LONDON 



MDCCCLXXIII 



The Right of Translation is reserved 



