308 MALL. [Vo.. XIX. 
No. 320. 
Ovum, 70 x 50 x 40 mm.; embryo, 18 mm. 
Dr. Gibbs, Baltimore. 
The chorion is fleshy and thick, with irregular spots of villi 
covering its surface. Some of the villi are fibrous and others 
are swollen; all are deficient in syncytium. The decidua is 
not typical, being well filled with fibrin, with occasional masses 
of leucocytes. Within, the entire chorion is lined by the 
amnion, which contains no magma. The umbilical cord is 
Fic. 320a—Whole ovum. Natural size. 
thin at its attachment to the chorion, but in its middle it is 
swollen, which, upon microscopic examination, proved to be 
a vesicle filled with a hyaline stringy mass tinged with car- 
mine. Otherwise the cord is fibrous, and in its center are 
seen the remnants of its blood-vessels. They are practically 
obliterated. 
The tissues of the embryo are pretty well dissociated, the 
cord and brain being nearly solid, with occasional irregular 
spaces representing the central canal. The outlines of the 
