No. 1.] ORIGIN OF HUMAN MONSTERS. 335 
embryo are macerated, but on account of the distended me- 
dulla which encroaches upon the mouth I think it likely that 
the tissues were dissociated before they became macerated. 
No. 346. 
Embryo, C. R., 13 mm. 
Professor Minot. 
A piece of hemorrhagic chorion, which may have been 50 
mm. in diameter, is attached to the embryo. Its tissues are 
macerated, but they are well enough preserved to show that 
much mucus and pus are between some of the villi. The 
Fic. 346.—Embryo attached to the ovum. X 2 times. 
structures of the chorion, amnion and cord appear normal, 
but the umbilical vesicle is filled with a necrotic mass. 
The embryo is dissociated and macerated. The central 
nervous system is dilated and the heart is distended with 
blood, some of which infiltrates the surrounding tissues. 
