the following contribution to vertebrate 



embryology is dedicated to the memory of the late 



Professor Francis Maitland Balfour 



by his devoted tupil, the author. 



On the Fate of the Blastopore, the Relations of the 



Primitive Streak, and the Formation of the 



Posterior End of the Embryo in Chelonia, 



together with Remarks on the 



Nature of Meroblastic Ova 



in Vertebrates. 



(Contributions to the Embryology of Beptilia, V.) 



By 



K. IVIitSukuri, Ph. D., Riéakuhakushi, 

 Professor of Zoology, College of Science, Imperial University, Tokyo, Japan. 



With Plates [.—XL 



CONTENTS. 



