PLATE VII. 
Fig. 7. Tangential Section through the Blastocyst Wall, showing cyto-trophoblast and 
plasmodi-trophoblast. x 320 d. pi., plasmodium ; nuc. 1 , cell with large single nucleus ; 
nuc?, cell with two nuclei. 
The cellular layer shows great irregularity in the size of the nuclei ; many cells show 
two, others three, some multiple nuclei. 
Fig. 8. Section of the Amnio-Embryonic Vesicle, x 320 d. 
The drawing represents the walls of the vesicle restored by the superposition of three 
successive sections. The mesoblast is slightly indicated, and the vesicle is seen to be 
attached more closely and firmly at one point. 
Fig. 9. Section of the Entodermic Vesicle, x 320 d. 
Some of the surrounding mesoblast cells and threads are represented. 
