A CONTRIBUTION TO THE 



EMBRYOLOGY AND PHYLOGENY 



OF THE 



PYCNOGONIDS 



A DISSERTATION 



PRESENTED \ > THE BOARD OF UNIVERSITY STUDIES FOR THE: 

 DEGREE OF DOCTOR OF PHILOSOPHY. 



T. H. MORGAN, 



Bruce Fellow, Johns Hopkim University. 



Reprinted from Studies from the Biological Laboratory. Vol. V. Mo. 1. 



BALTIMORE: 



PRESS OF ISAAC FRIEDENWALD ). 



1891. 



