(memoirs of the Museum of Comparative Zodlogy 
AT HARVARD COLLEGE. 
Vou. XL. No. 9. 
STUDIES FROM THE NEWPORT MARINE LABORATORY. 
COMMUNICATED BY ALEXANDER AGASSIZ. 
Xaver 
THE DEVELOPMENT OF OSSEKOUS FISHES. 
is 
THE .PRE-EMBRYONIC STAGES OF DEVELOPMENT. 
PART SECOND.—THE HISTORY OF THE EGG: CLEAVAGE, FORMATION OF THE 
PERIBLAST, AND DEVELOPMENT OF THE GERM RING. 
BY 
ALEXANDER AGASSIZ anv C. O. WHITMAN. 
WITH ELEVEN PLATES. 
CAMBRIDGE, U.S. A.: 
Printed for the Museum. 
Apri, 1915. 
