Fig60. 



Fig 6 1. 



Fig 64 



somme^o. 



y.s 



Fig.62. ^^^.^ : .,.-' 



Fig65. ~^^s'"' 



Figs. 60, 61 and 6-2.— Diagrams of Transverse Sections of Blastoderm 



to illustrate Extension and Splitting of Mesoderm, 



ect., ectoderm ; ent., entoderm ; raeso., mesoderm ; som.meso., somatic mesoblast ; c, coelome. 



Figs. 63 and 64. — Diagrams of Transverse Sections to illustrate the 



Separation of the Embryo from the rest of the Blastoderm. 



6., embryo ; l.f., lateral fold of amnion ; c, coelome ; p.g., primitive gut ; y.s., yolk sac. 



Fig. 65. — Diagram of Longitudinal Section to illustrate the 



Separation of the Embryo. 



e., embryo ; h.f., head fold of amnion ; t.f., tail fold of amnion ; y.s., yolk sac. 



