^COMPARATIVE ZOOLOGY 



Structural and Systematic 



FOR USE IN SCHOOLS AND COLLEGES 



By JAMES ORTON, A.M., Ph.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 

 compare. ' ' — Agassiz 



U» national Muaeu* 



WmtSO WfAB INST'TUTfON 



LI 3BAHI.ES 



NEW YORK 

 HARPER & BROTHERS, FRANKLIN SQUARE 

 1883 



