12 RICHARD ASSHE'TON AND THOMAS G. STEVENS. 
We regard this space containing a coagulum and blood 
corpuscles and cell detritus as one of probably many large 
blood sinuses into which the lobate terminations hung freely. 
The characters of the epithelium covering these parts of the 
villi are those of an epithelium perfectly free from pressure. 
Moreover, we can find no cells amongst the detritus which 
we cannot ascribe in origin to these epithelial coverings. 
There is no trace of any other kind of cell, as, for instance, 
cells which might line an expanded uterine gland. 
We should expect to find communications between this 
space and the maternal channels of region B, and also 
evidence of connecting pieces which joined the after- 
birth to the uterine walls if the condition described above 
resembles that of the Carnivora as described by Duval 
(5), ete. 
In fig. 7 (w) we believe there is such a communication. 
It is a drawing of a vessel just inside region B, which 
apparently crosses the boundary layer and opens out into the 
space between the foetal villi in region C. There is no doubt 
that this is one of the larger maternal blood-vessels, as it has 
the same characteristic appearance as all the others already 
described. It hes within region B because smaller maternal 
vessels can be seen between it and region C, as shown at 
m. ch’, in the diagram. The foetal plate which appears to 
divide B from Cis shown at f.c., and it will be noted that the 
wall of the vessel depicted seems to end abruptly at this line. 
Up to this point inside the vessel we find the usual red cor- 
puscles and very numerous leucocytes, but projecting from 
the region C into the vessel a coagulum will be found 
apparently identical with the coagula seen in various parts of 
region C. 
We think that there can be very little doubt that the epithe- 
lium covering the lobate terminations in region C (fig. 12) is 
continuous with and has a similar origin to the syncytial 
layer of region B, in spite of the rather different character of 
nucleus; because of the connection which we can in certain 
places trace between the two, and of the identity of relation 
