162 MALL. [VoL. XIX. 
Fic. 37b.—Section through the head, umbilical vesicle and chorion. The 
pharynx and first aortic arches are cut across in the head. XX I0 
times. 
Fic. 37¢.—Section through the umbilical cord, vesicle and the chorion. 
>< 10 times. 
Fic. 37d.—Section through the attachment of the umbilical cord and 
vesicle to the chorion. > Io times. 
