204 MALL. [Vou. XIX. 
Fic. 304b.—Section of the whole ovum encircled by the decidua. XX Io 
times. 
Fic. 304c—Section of the villi and surrounding tissue. XX 65 times. 
D, decidua; S, syncytium; V7, villus; Ch, chorion; M, mucoid sub- 
stance rich in leucocytes. 
