No. 1.] OKIGIN OF HUMAN MONSTERS. 271 
Fic. 278b.—Outline of the main wall of the chorion, C, showing the 
strands of mesoderm, M, that cross the ccelom, in which there is a 
small epithelial mass, E, possibly the remains of the embryo. xX 18 
times. 
Fic. 278c.—High power drawing of the epithelial mass, strands of meso- 
derm and chorion. > 50 times. 
Fic. 278d.—The epithelial mass. X 500 times. 
