Dr. Clarke's Account , &c. 
368 
EXPLANATION OF THE PLATES. 
(Tab. XIX.) 
A view of the foetal surface of the placenta, with the arteries 
and vein injected. 
a. The funis umbilicalis ; the vein is exhibited to shew its 
increased size. 
bbb. The shaggy vessels of the chorion, forming the foetal 
portion of the placenta. 
c. The cavity, or cyst, in which the tumour (vide Tab. XX.) 
lay. 
(Tab. XX.) 
An external view of the tumour, contained in the cyst formed 
in the substance of the placenta, as seen in Tab. XIX. 
a. A branch of the umbilical artery entering the tumour. 
b. The vein returning the blood from the tumour to the um- 
bilical vein. 
c. A square portion of the capsule which contained the tu- 
mour, turned down to shew the internal structure. 
d . The substance of the tumour, seen through the opening 
left by dissecting off the capsule. 
