528 
PROFESSOR W. TURNER ON THE PLACENTATION OF THE APES. 
length. Tile upper limb was 4 inches long, the lower limb 5 inches. The size and 
state of development of the foetus confirmed the opinion I had formed during the life 
of the monkey that she was far advanced in pregnancy. 
The umbilical cord was 4§ inches long, and passed from the belly of the foetus 
between the back of the left thigh and leg to the more anterior lobe ot the placenta. 
The cord was then cut through and the foetus removed, when the position and form of 
the placenta were seen. The placenta was divided into two distinct lobes ; the one 
attached to the anterior, the other to the posterior wall of the uterus. The posterior 
lobe was almost circular in form ; its vertical diameter being o\ inches, its transverse 
diameter 3 inches. Its upper border almost reached the summit of the fundus uteri, 
its lower border was 2^ inches from the os internum. Its foetal surface was traversed 
by shallow furrows which indicated a division into six lobelets. The anterior lobe 
was circular in form, its vertical and transverse diameters being alike 3 inches ; the 
upper border did not approximate so closely to the fundus as that of the anterior 
lobe ; the lower border was 1 inch from the os internum. The division of the anterior 
lobe into lobelets by superficial furrows was not so distinct as in the posterior lobe. 
The anterior and posterior lobes were separated from each other by intermediate 
smooth non-placental parts of the chorion, situated in relation to the lateral aspects 
of the uterus ; the smooth part to the right was 1 inch in transverse diameter at its 
narrowest, whilst the smooth part to the left had a transverse diameter of 2 inches at 
its narrowest. The summit of the chorion at the fundus uteri, where it passed 
between the upper borders of the two placental lobes, was also smooth, and the most 
depending part of the chorion, in relation to the os internum, was smooth over a 
considerable area. 
The umbilical cord joined the foetal surface of the anterior placenta two inches from 
its upper border, and If inch from its left border. The umbilical vessels then 
branched, some of the branches entered the anterior placenta, but others ran with 
a tortuous course over its foetal surface and across the intermediate smooth parts of 
the chorion, in relation both to the sides of the uterus and its fundus, to reach the pos- 
terior placenta. No vessels, however, ramified in the smooth chorion opposite the os 
internum. The ramifications of the blue injected foetal vessels were very distinct on 
the foetal surface of both placentae, and the smaller vessels of the placental chorion 
were extremely tortuous. The substance of the anterior placenta contained a larger 
proportion of blue injected vessels than did that of the posterior, whilst the posterior 
placenta had a larger proportion of red injection in it than the anterior. This 
difference in the relative proportion of the two injections is capable of the following 
explanation. In injecting the vessels of the cord, the chief pressure was on the ante- 
rior placenta, for the cord directly joined it, and its foetal vessels were therefore more 
completely filled with the blue fluid. But in injecting the uterine vessels through the 
aorta, the chief pressure had been on the posterior placenta, and therefore its maternal 
vascular spaces had been most completely filled with the red-coloured gelatine. 
