574 
PROF. W. TURNER ON THE PLACENTATION OE THE LEMURS. 
villous, and the surface of the mucosa in the region of the left Fallopian tube, with which 
it was in apposition, was not only folded, but subdivided into multitudes of crypts. That 
the chorion had also been prolonged into the non-gravid horn is evident from the pre- 
sence of crypts on the surface of a part of its mucosa. 
The amnion and allantois were so much injured that it was not possible to ascertain 
their relations to the chorion. The umbilical cord was 2 inches long, and contained 
two umbilical arteries and one vein, the latter of which bifurcated as it approached the 
placenta. The foetus was well developed, and measured 5 inches from the tip of the 
nose to the root of the tail. The tail was 3% inches long. The surface of the body 
was covered with hair, and the nails were distinct. The incisor, canine, and premolar 
teeth were erupted, but the molars were concealed by the gum. The foetus was a male. 
Gravid Uterus of Lemur rufipes. 
The gravid uteri of the four specimens of this Lemur varied somewhat in size and in 
the development of the embryos. In the smallest specimen, which I shall name A, the 
uterus was distinctly two-horned. A single foetus occupied the left uterine cornu. The 
length of this horn with the body of the uterus was 3^ inches, and the fundus uteri, 
which was formed entirely by the left cornu, reached l-^ inch beyond the place of 
attachment of the left Fallopian tube ; the breadth of this horn was inch. The 
right cornu was only inch long and ^ inch broad. The other three specimens, which 
I shall name B, C, D, each contained a single foetus ; in B and C it was on the left side, 
and in D on the right. In all the uterus was very unsymmetrical in form, owing to the 
much greater development of the cornu of the side containing the foetus over the oppo- 
site horn. The fundus of the uterus was formed by the gravid horn, which in B 
projected inch beyond the place of attachment of the corresponding Fallopian 
tube, in C 1| inch, and in D only § inch. In B the left cornu and corpus uteri 
together measured 4 inches in length, and in C 4^ inches ; in D the right cornu and 
corpus uteri were together 3f inches long. In all three the non-gravid cornu 
appeared as a short diverticulum from the side of the corpus uteri, with which it freely 
communicated, a short septal fold, as in Propithecus, marking the plane of separation 
between the two horns. In the four specimens the ovaries were about as large as peas. 
In A, C, and D the corpus luteum was in the ovary corresponding to the gravid cornu ; 
in B it was in the ovary of the opposite horn. As A was evidently at an earlier stage 
of development, I shall reserve its description until after I have pointed out the 
characters of B, C, and D. 
In B and D the foetus lay longitudinally in the uterus, with the head presenting to 
the os uteri ; in C the direction of the foetus was more oblique, the head, though lying 
towards the os, being situated near the uterine orifice of the right Fallopian tube. In 
all three the caudal end of the foetus was in the fundus uteri formed by the gravid 
horn. In these specimens the chorion was uninjured. When each uterus was opened 
into by a longitudinal incision through the posterior wall, the chorion was seen in situ 
