memoirs of t^& iPuseum of Comjjaratibe ^oologs 



AT HARVARD COLLEGE. 

 Vol. IX. No. 2. 





SELECTIONS 



FROM 



EMBRYOLOGICAL MONOGRAPHS. 



COMPILED BY 



ALEXANDER AGASSIZ, 

 WALTER FAXON, and E. L. MARK. 



II.-ECHINODERMATA. 



By, ALEXANDER AGASSIZ. 



WITH FIFTEEN PLATES. 



^^!<i( 



CAMBRIDGE: • 



Pn'nteti for tfjc fHuacum. 

 July, 1883. 



