DETAILS OF EARLY EMBRYO. 



mes 



x 



Figs. 72 A E. Transverse sections and details of the blastoderm shown in fig. 72. The sections pass anteriorward from 

 the region of the caudal folds, shown in section A, as far as the "neck" region of the embryo, section E. 



<l. Beginning, of .egmentol duct. " Mejoderro 



ect. Ectoderm at the point where thi. becomes conlimiou. with the V- Yolk lying free in the pit only. 



meKxiemi in the l,il fold, ol the embryo. *. Urogeniul .!.. 



cut. Entoclrim. 



