/IDemolrs of tbc fIDuseum of Comparative ZooIoqs 



AT HARVARD COLLEGE. 

 Vol. XL. No. 9.., 



STUDIES FROM THE NEWPORT MARINE LABORATORY 



Communicated by Alexander Agassiz. 



XVI. 

 THE DEVELOPMENT OF OSSEOUS FISHES. 



II. 



THE PRE-EMBRYONIC STAGES OF DEVELOPMENT. 



PART SECOND. — THE HI8TORY OF THE EGG: CLEAVAGE, FORMATION OF THE 

 PERIBLAST, AND DEVELOPMENT OF THE GERM RING. 



BY 



ALEXANDER AGASSIZ and C. O. WHITMAN. 



WITH ELEVEN PLATES. 



CAMBRIDGE, U.S.A.: 



|)ciiUeC) for tbe /Duseum. 



April, 1915. 



