LECTURES 



ON THE 



ELEMENTS OF COMPARATIVE ANATOMY. 



BY 



THOMAS HENRY HUXLEY, F.R.S., 



PROFESSOR OF NATURAL HISTORY, ROYAL SCHOOL OF JUNES ; AND PROFESSOR OF COMPARATIVE ANATOMY AST) 

 PHYSIOLOGY TO THE ROYAL COLLEGE OF SURGEONS OF ENGLAND. 



ON THE CLASSIFICATLON OF ANIMALS 



AND 



ON THE VERTEBRATE SKULL. 



LONDON: 

 JOHN CHURCHILL AND SONS, NEW BURLINGTON STREET. 



MDCCCLXIV. 



