TEXT-BOOK OF ZOOLOGY 



FOE JUIsriOE STUDENTS. 



BY 



HENRY ALLEYNE NICHOLSON, 



M. D., D. Sc, Ph. D. (G5tt.), P. L. S., F. G. S., 



EEGina PBOFKSSOB 01' NATDEAL HISTOKY IN THE ONIVBRSITT OF AGEBDEEN. 



FOURTH EDITIOIS, 

 EEVISED AND ENLARGED. 



NEW YORK: 

 D. APPLETON AND COMPANY, 



1, 8, AM) 5 BOND STREET. 



1888. 



