Memoirs MCZ 4009

riDemolrs of tbe /iDuseum of Comparative Zoology AT HARVARD COLLEGE Vol XL STUDIES FROM THE No NEWPORT MARINE LABORATORY Communicated by Alex.\nder Agassiz XVI THE DEVELOPMENT OF OSSEOUS FISHES II THE PRE-EMBRYONIC STAGES OF DEVELOPMENT PART SECOND — THE HLSTORY 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.: prlnte& foe tbe /Duseum April, 1915 PREFATORY NOTE The Agassiz, study of young fishes was one of the early zoological interests of and he had published a number late Prof C O Whitman joined of papers the staff of the ' previous to 1883 when Museum of Comparative During a part of the years 1883-1886, Professor Mr the Zoology Whitman worked upon the some pelagic fishes both at the Newport Laboratory and at the Museum, and some of the results of his studies were published in collaboration with Mr Agassiz in the Proceedings of the American Academy and in the of development Memoirs of the Though Museum.' the eleven plates for another part of the to cleavage, formation of periblast Memoirs and the development to be ' ' devoted germ ring" were was evidently not of the printed so long ago as October, 1885, the accompanying text written The plates, and tion, this however, seem of sufficient importance to warrant their publica- has been made possible through the kind interest of Prof R M Strong of the University of Mississippi, formerly of the University of Chicago Professor Strong carried out a thorough search manuscripts for any records upon the embryology of written a brief introduction who most To Professor among fishes, Whitman's and has most-kindly Professor Strong and to Mrs- C O Wliitman, willingly aided him, sincere acknowledgements are tendered Samuel Henshaw ' of The development some osseous fishes of flounders