DETAII,S OF EARLY EMBRYO. 



89 



• *v** 



Figs. 72 A-E.— Transverse sections and details of the blastoderm shown in fig. 72. The seclions pass anleriorward from 

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



(i. Btginmngsofsegmenulducl. "'«»■ Mesoderm. 

 ect. Ectoderm at the point where this becomes continuous with the II- Yolt lymg tree in the gut cavily. 



mesoderm in the tail (olds of the embryo. r. Urogenital anlage. 



ent. Entoderm. 



