558 
PROFESSOR W. TURNER ON THE PLACENTATION OF THE APES. 
Fig. 2. Vertical section through the non-placental part of the chorion, the decidua 
vera, and the muscular wall of the same uterus, the section being made 
near the os internum. X 300. 
am. The cells of the amnion, partly shown in profile and partly with 
them flat surfaces. 
eh. The chorion. Two ridge-like elevations of which may be seen 
fitting into furrows of the decidua vera. 
ee. Columnar epithelium covering the decidua vera. 
se. The sub-epithelial cell-tissue of the decidua, the darkly-shaded 
spots in which represent sections through divided blood-vessels. 
s. A space in the sub-epithelial tissue. 
mm. Layer of muscularis mucosae. 
sm. Submucous areolar coat. 
m. Muscular coat of the uterus, divided into two layers and exhibiting 
sections through divided blood vessels. (Page 530.) 
Fig. 3. Vertical section through the decidua vera of the human uterus at the fifth 
O O 
month. X 20. 
e. The compact cellular layer which represents in its position the epi- 
thelium ; in it are the depressions of tubular glands. 
se. The more superficial part of the spongy layer immediately subjacent 
to the compact cellular layer. 
sp. The deeper and more characteristically spongy part of the spongy 
layer. (Page 543.) 
Fig. 4. Vertical section through a portion of the same human decidua vera. X 300. 
e. The stratified cells of the compact layer, representing in their super- 
ficial position the epithelium. 
se. The subjacent spongy layer in which are situated rows of fusiform 
cells, which have a general resemblance to the cells of non-striped 
muscle. 
s. A space in this tissue. (Page 544.) 
PLATE 49. 
Fig. 5. A vertical section through the uterine wall and placenta of Macacus cyno - 
molgus. Natural size. 
cli. The placental chorion and umbilical cord. 
u. The muscular wall of the uterus. 
s. The spongy layer of the decidua serotina. 
c. The compact layer of the decidua serotina. From the placental 
surface of the chorion the stems of the villi may be seen to pass 
