ON 



THE PRINCIPLES OF CLASSIFICATION 



THE ANIMAL KINGDOM; 



ON 



THE STRUCTURE OF 



THE HALCYONOID POLYPI; 



ON 



THE MORPHOLOGY OF 



THE MEDUSA 



BY LOUIS AGASSIZ, 



PROFESSOR OF ZOOLOGY AND GEOLOGY IN THE LAWRENCE SCIENTIFIC 



SCHOOL, HARVARD UNIVERSITY. 



From Proceedings of the Third Meeting of the American Association for the 

 Advancement of Science, held at Charleston, March, 1850. 



CHARLESTON, S. C. 



STEAM-POWER PRESS OF WALKER AND JAMES. 



1850 



