COMPARATIVE ZOOLOGY 



STRUCTURAL AND SYSTEMATIC 



FOR USK IN 



Scbools anD Colleger 



BY 



JAMES ORTON, A.M., Pn.D. 



LA.V* PBOFK8BOK OF NATUBAL HISTORY I YAS8AB OOLI.KOE, CORRESPONDING 



1IEMUKK OK TllK ACAI1KMY OF NATURAL 8OIENOK8, PillLADKLPIilA 



AND OK TUB LYCEUM OF NATURAL HISTORY, N. i., JCTO. 



NEW EDITION. REVISED BY 



CHARLES WRIGHT DODGE, M.S. 



PROFESSOR OF BIOLOGY IN THB UNIVERSITY OF UOOH 



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

 to compare." AGASSIZ 



NEW YORK : CINCINNATI : CHICAGO 



AMERICAN BOOK COMPANY 



