324 
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Mena) PAU? 
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Uterine fatus with chorion and foetal appendages, Macropus major. The foetus is magnified twice the 
b, fig. 141) was spread out, its figure a 
0, 46 to have Sank’ shit of a cone, oF which 
the apex was the umbilical chord, and the 
base the terminal vessel above-mentioned. 
Three vessels could be distinguished diverging 
from the umbilical chord and ramifying over it. 
Two of these trunks contained coagulated 
blood, and were the immediate continuations 
of the terminal or marginal vessel: the third 
was smaller, empty, and evidently the arterial 
trunk. ides the extremely numerous rami- 
fications diSpersed over this membrane, it dif- 
fered from chorion in being of a yellowish 
tint. Theamnios (c, 141) was reflected from 
the umbilical chord, and formed, as usual, the 
immediate investment of the foetus. 
The umbilical chord measured two lines in 
length and one in diameter. It was found to 
contain the three vessels above-mentioned, with 
a small loop of intestine; and from the ex- 
tremity of the latter a filamentary process was 
continued to the vascular membrane. The 
MARSUPIALIA. 
margins of the umbilicus or abdominal ope 
ing were very strong, offering much resistang 
to their division. On tracing the contents” 
the chord into the abdomen, the two le 
vessels with coagulated blood were found - 
unite; the common trunk then be 
wards beneath the duodenum, and after be 
joined by the mesenteric vein, went to t 
under surface of the liver, where it penetrat 
that viscus: this was consequently an omph 
mesenteric or vitelline vein. e artery | 
a branch of the mesenteric. The membra 
therefore, upon which they ramified, answer 
to the vitellicle, i. e. the vascular and m 
cous layers of the germinal membrane, whic 
spreads over the yolk in ovi nimi 
and which constitutes the umbilical vesicle 
the embryo of ordi Mammalia. The | 
mentary pedicle which connected this men 
brane to the intestine was given off near t 
end of the ileum, and not continued from | 
cecum, the rudiment of which was very e\ 
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