A 



MANUAL OF ZOOLOGY 



FOR THE USE OF STUDENTS 



WITH A GENERAL INTRODUCTION ON THE 

 PRINCIPLES OF ZOOLOGY 



BY 



HENRY ALLEYNE NICHOLSON 



ss 



M.D., D.Sc., PH.D. (GoTT.), F.R.S.E., F.L.S., F.G.S. 



PROFESSOR OF NATURAL HISTORY IN THE 

 UNIVERSITY OF ST ANDREWS 



SIXTH EDITION 

 REVISED AND ENLARGED 



LIBEAJ 



UNI'\ [TY < 



WILLIAM BLACKWOOD AND SONS 



EDINBURGH AND LONDON 



MDCCCLXXX 



