COMPARATIVE ZOOLOGY 



STRUCTURAL AND SYSTEMATIC 



FOR USE IN SCHOOLS AND COLLEGES 



BY JAMES ORTON, A.M., Pu.D. 



LATE PROFESSOR OF NATURAL HISTORY IN VA3SAR COLLEGE; CORRESPONDING MEMBER 



OF THE ACADEMY OF NATURAL SCIENCES, PHILADELPHIA, AND OF THE 



LYCEUM OF NATURAL HISTORY, NEW YORK; AUTHOR 



OF "THE ANDES AND THE AMAZON," ETC. 



REVISED EDITION 



" The education of a naturalist now consists chiefly in learning how to 

 compare. ' ' AG ASSIZ . 



NEW YORK 

 HARPER & BROTHERS, FRANKLIN SQUARE 



1889 



