6 



RadclifFe College Monographs 



No. 8 



The Primitive Streak 



AND 



NOTOCHORDAL CaNAL IN ChELONIA 



BY 



GERTRUDE CROTTY DAVENPORT, B. S. 



PREPARED UNDER THE DIRECTION OF 



EDWARD LAURENS MARK, Ph.D., LL.D. 



HKRSEY PROFESSOR OF ANATOMY IN 

 HARVARD UNIVERSITY 



WITH ELEVEN PLATES 



BOSTON, U.S.A. 



PUBLISHED BY GINN & COMPANY 



1896 



