200 MALL. [VoL. XIX. 
lined with the amnion. The head of the embryo is atrophic, 
the body being shaped like a grain of wheat. The extremities 
are more rudimentary on the right side than on the left. 
The sections of the embryo show the cord distended, the 
brain almost completely destroyed and the mesoderm of the 
top of the head converted into a mass of mucoid tissue. The 
head end of the chorda is greatly hypertrophied, being con- 
verted into a mucoid tumor. On either side of this tumor 
there are two large cartilages, normal in structure. Farther 
headwards, buried deep in the mesoderm, there are two addt- 
tional pearl-like bodies, which, on account of their appearance 
as well as by their being encircled by an oval zone of pigmented 
Fic. 135b, c, d—Three views of the embryo. Natural size. 
cells, identifies them as the lenses of the eyes. These bodies 
have within them lens fibers, making them look much like the 
lenses of amphibians. 
The front end of the head is necrotic. The heart is con- 
voluted, its outline obscure and it is distended and filled with 
a mass of blood cells. The outline of all of the abdominal 
organs and of the peritoneal cavity can be determined, 
although the tissues are considerably obscured by the great 
quantity of round cells within them. 
The entire wall of the chorion is very thin, and it is lined 
throughout with a delicate amnion. The villi have all dis- 
appeared and in their place there are islands of necrotic syn- 
cytium covered with a hyaline layer of fibrin. The whole 
chorion is infiltrated with leucocytes, which form small 
abscesses at points. 
