256 MALL. [Vor. XIX. 
From Mr. Lankford, Baltimore. 
A large portion of the chorion is covered with well formed 
and apparently normal villi; a portion is hemorrhagic and 
another is fibrous, appearing as though it had protruded 
through the os. Sections through this portion show that the 
villi are atrophic and have undergone fibrous degeneration. 
The chorion is thickened and the decidua is infiltrated with 
leucocytes. 
The inside of the chorion is lined with epithelial cells, which 
are continuous with those over the cord; it appears as if the 
amnion had become completely blended with the chorion. 
The cord is also fibrous, with some spots which have under- 
gone mucoid degeneration. It contains three large blood- 
vessels,—a vein and two arteries. The body at the end of 
the cord is simply its continuation, with the umbilical vein 
running throughout it lengthwise. 
No. 261. 
Chorion, 120 x 70 x 70 mm.; embryo, about 90 mm. long. 
Dr. W. M. Lewis, Baltimore. 
Fic. 261a.—External view of specimen. Three-fifths natural size. 
