eni 



Fig 60 ' -- 



Fig64 



som me50. 



ent 



Fig 61. 



y.s. 



Fig62. ^^-.^ ; .,.-' 



Fig65. y.s. 



Figs. 60, 61 and 62. — 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. 



e., 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. 



