. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE FCETUS. 1029 2. Pig.—The placenta is formed by an expansion of the villous tubercles, as in Solipeds. The chorion is not entirely covered by these tubercles, but here and there it shows bright little patches, where its tissue is merely covered by an epithelial layer; it is also glabrous at those points wliere it is in cont:ict with the chorion of neighbouring foetuses. The chorion has not a body and two coruua, but is merely an elongated sac, the two extremities of which are in relation with the adjacent foetuses. T
. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE FCETUS. 1029 2. Pig.—The placenta is formed by an expansion of the villous tubercles, as in Solipeds. The chorion is not entirely covered by these tubercles, but here and there it shows bright little patches, where its tissue is merely covered by an epithelial layer; it is also glabrous at those points wliere it is in cont:ict with the chorion of neighbouring foetuses. The chorion has not a body and two coruua, but is merely an elongated sac, the two extremities of which are in relation with the adjacent foetuses. The inner face corresponds, as in Ruminants, with the amnion and allantois. The latter is the same as in the Cow, tliough it is very much shorter; the inner covering of this membrane contains the glycogenic matter, but that of the amnion has none. The umbilical vesicle, amnion, and cord, are also the same as in Ruminants. 3. Carnivora.—Tlie placenta is a thick gir<lle, surrounding the middle portion of the chorion. It has a Uvid colour in its middle, green on its borders. When the green-coloured matter is isolated, and treated with alcohol and chloroform, then submitted to certain reagents, it appears to be identical with the colouring matter of the bile, and derived, as that is, from the haemoglobin of tlie blood. The allantois is disposed, in principle, as in Solipeds. The chorion is quite like that of the Pig with regard to form, but it is diflferent with regard Fig. SEMI-DIAGRAMMATIC VERTICAL SECTION OF A MATERNAL COTVLEDOX OF THE SHEEP. (^cr, Uterine sinus; e, epithelial lining of the sinus; V, veins, and c, flexuous arteries of the sub- epithelial connective tissue. to structure, as it hac no chora plates v/ith mineral granules. Nothing is known as to the organ which fulfils the function of these deposits. The umbilical vesicle—yfhidi remains VQvy developed at all periods of foetal life—resembles in shape the allantois of the Pig, being a transversely elon
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