LECTURES 



ON THE 



COMPARATIVE ANATOMY AND niYSIOLOGY 



OF THE 



INVERTEBRATE ANIMALS, 



DELIVERED AT THE ROYAL COLLEGE OF SURGEONS. 



BY RICHARD OWEN, F.R.S. 



nUNTERIAN FROFESSOE TO THE COLLEGE. 



SECOND EDITION. 



ZX.XUSTRATED BY NUMEROUS VTOODCUTS. 



LONDON: 



LONGMAN, BROWN, GREEN, AND LONGMANS. 



^^1855. 



