79 
of nerves in the placenta, 
more distinctly ; the broken off portions of nerves are shown 
projecting beyond the edges of the outline of the figure. 
Fig. 4. A transverse section of the placenta magnified ten 
diameters, showing its structure : the nerves are so readily 
distinguished by their course from the blood vessels, as to 
require no explanation. 
Fig. 5 and 6 . A single floculus of the tissue separated, and 
magnified ten diameters, exposing the terminal branch of the 
umbilical artery (and its accompanying nerves), where it 
ends in pencilli of infinitely small ramifications. 
A. The pencilli. 
B. Surface of the chorion. 
Fig. 7. The mode in which the arteries of the umbilical 
chord begin to ramify on the chorion, and dip down into the 
substances of the placenta, magnified two diameters ; the 
nervous filaments are distinctly seen. 
Plate III. 
Fig. 1. A portion of the uterine surface of the chorion of 
the tapir ; natural size. 
Fig. 2. A very small portion of the same, magnified fifty 
diameters. 
Fig. 3. Lateral view of a section of the same ; magnified 
fifty diameters. 
Fig. 4 . A very small portion of the foetal surface ; mag- 
nified fifty diameters. 
