FIG. 69. HUMAN OVUM, SAID TO BE FROM FIFTEEN TO EIGHTEEN DAYS OLD. (Compare footnote, 



page 134.) 



The chorion has been opened and spread out to show the embryo and its adnexa. A/, Body-stalk containing 

 the allantoic diverticulum. Am, Amnion surrounding the embryo. Vi> Yolk-sac. 



133 



