form they assumed was exactly that of the two-horned uterus, with the' horns,
however, side by side, or only slightly divergent. On floating the membranes
thus distended into the opened uterus, the right horn was found to be fully
occupied by the right sac, and the portion below the line of union of the
sacs exactly filled up that portion of the uterine cavity lying above the os and
formed by the common cavity of the uterus and á portion of the left horn. On
forcing the dilated left sac into the left horn through the opening and channel,
that cavity was also filled with its sac' of membranes. The line of union of the
two sacs corresponded to the opening into the left horn, and the space between
the sacs at this point was occupied by the crescentic free margin of the septum
dividing the horns at that point. The portion of the sac of the membranes which
filled up the common cavity of the uterus had that portion which was opposed
to the os uteri internum smooth, but bearing a short free fringe or fold on the surface
of the chorion; commencing slightly dorsally towards this pole and then bending
off at an obtuse angle, it ran forwards immediately towards the right side of the line
of junction of the sacs of the left and right horns, where it bifurcated, one branch
running for a short distance along the sac of the right horn, and the other and more
prominent branch along the sac of the left horn. The fold on the pole was covered
with fine villi. Professor Turner failed to detect the bare area opposite the os uteri
internum in the Manis membranes originally described by Sharpey, but they do
not appear to have been in a satisfactory condition. I t is improbable that this bare
patch will be found to characterise the membranes of all bi-homed uteri with
a diffuse placentation. The remaining bare parts and villous areas were well
seen in the inflated membranes, and a better idea was gained of their distribution
than from the uterine surface. The bare tracts were seen to be along the direction
of the long axis of the sac, but they were not at all numerous, there being
only about eight originating in an irregular way from the pole opposite the os uteri
internum. These bare tracts were of various widths, with a slight curvature
along the sac, and they were more or less broken up by isolated offshoots
from the intervening villous areas which were much broader than the bare
tracts. As they were traced along the sac of the right horn, the bare tracts
became wholly interrupted, and isolated bare areas of various forms were thus produced
and. at different intervals, the chorion being much more villous than bare*
Some of these bare patches were branched, others were linear; some were elongated
ovals, and others round. In the portion of the sac immediately opposite to the os
uteri internum there was a large bare tract nearly circular communicating with
other bare areas around it and nearly enclosing a round villous area with a bare portion
in its centre. The Eallopian extremity of the sac was sparsely covered
with villi, which were less developed than on the other parts, but as the portion,
immediately around the Eallopian end of the sac was injured by rupture, I am not
in a position to say what its characters were. The broad bare tract or band described
by Sharpey corresponded in this, as in Orcella, Platcmista and the Tapir, to the
course of the great vessels of the cord. I t was prolonged forwards to near the
Eallopian pole of the right sack, but divided into two at its extremity, and the other
end of the tract ceased at the point where the chorion was bent on itself to reach
the left horn, although the great vessels were also found along that sack. The
centre of the bare tract throughout the greater part of its extent was marked by
two parallel longitudinal folds, which joined each other at their lower ends. I did
not detect on this tract bodies resembling those which I have figured as occurring
in Orcella. Erom the point where this bare tract ceased, a short narrow fringe
was continued on to the left horn. The bare patches on this chorionic surface were
much the same as in the right horn, but the last third or Eallopian extremity of
the horn was destitute of villi; the surface of the chorion, however, opposed to the
orifice of the Eallopian tube was thrown into a number of fine convolutions, which
doubtless closed the orifice, but were also free of villi. The bare patches were
much more irregularly distributed on this diffuse placenta than in Platamsta or
Orcella, and they were less numerous, but their structure was essentially similar.
The villi were distributed in irregular wavy lines, which freely anastomosed
with each other, but I did not observe that the ridges of the chorion started from
the margins of the bald stripe and ran round the horn as has been described by
Sharpey in the membranes of the Mams he examined, but towards its margins there
was a distinct but local convergence of the fine ridges of the chorion. They were
all closely separated from each other by narrow interspaces destitute of villi. The
villous surface viewed under a low power had the appearance of being composed of
minute ridges, which gave off still much more minute secondary ridges, which anastomosed
with their fellows surrounding them, so that a highly reticulated appearance
was produced, the secondary ridges enclosing clear interspaces destitute of
villi, but varying little in size, and proportionate to the size of the primary
ridges; these primary ridges did not exceed 0’80" in length, and the interspaces
had about the same dimensions. The surface of the mucosa had much the same
appearance, the clear interspaces corresponding to the villous tufts of the chorion.
The amnion invested the whole of the inner surface of the chorion except
that portion of it on which lay the allantois, which had much the same proportional
capacity and relative arrangement as in Orca, Orcella, and Platanista,
reaching from near the Eallopian end of the right horn into the first portion of
the left horn, but how far into the latter I cannot say, as its walls had ruptured in
the left sack. A small umbilical vesicle was present. The cord measured 2-25*
in length, and on its amniotic covering I observed two cyst-like bodies imbedded
in, its substance and doubtless glandular in their nature, and one oval-shaped
pedunculated body with two processes near its extremity, from which a long
filament hung down. This body probably corresponds to the hippomanes of the
cord of the mare. The amnion nearer the allantois was covered with minute
rounded bodies like those I have described on the amnion of Platamsta.
I t was by a mere aecident that I became possessed of this uterus, and as the
temperature at the time was 95° Eah., I was not in a position to make any
injections of the chorionic vessels to ascertain the character of the villi, nor of the