COMPARATIVE ZOOLOGY 



STRUCTURAL AND SYSTEMATIC 



FOR USE IN SCHOOLS AND COLLEGES 

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



LATE PROFESSOR OF NATURAL HISTORY IN VASSAR COLLEGE; CORRESPONDING 

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

 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.' 1 ' 1 AGASSIZ 



NEW YORK 



HARPER & BROTHERS, FRANKLIN SQUARE 

 1886 



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