A TREATISE 



ON 



COMPARATIVE EMBEYOLOGY 



BY 



FRANCIS M. BALFOUR, LL.D., F.R.S., 



I'ELLOW AND LECTUBER OF TRINITY COLLEGE, CAMBRIDGE. 



IN TWO VOLUMES. 



VOL. II. 



MACMILLAN AND CO. 



1881 



[The Right of Translation is reserved. 



