Fig. 8 



Fig, 9 



Figs. 8, g. — Sectional view of two earliest embryos of the armadillo. 

 The two are shown overlapping, to save space. (For description see 

 text, stages I and II.) The trophoblast {tr) and inner-cell mass (ic m), 

 ectoderm (ec), and endoderm {en) are shown. The point X is the 

 apical pole of the egg. (Modified from Patterson.) 



