XVI. On the placentation of the Apes, with a comparison of the structure of their placenta with that of the human female

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Abstract
The placenta in the Quadrumana has from time to time engaged the attention of anatomists. John Hunter seems to have been the first to describe and figure the placenta of monkey, which had been shed in the ordinary course of parturition, after the birth of a single fœtus. The placenta was divided into two oblong contiguous lobes, and ach lobe was made up of smaller lobes closely united together. Fissures were seen n the uterine surface of the placenta, in which were situated veins or sinuses that eceived the blood laterally from the lobes, and that passed through the decidua to ter the substance of the uterus. The substance of the placenta seemed to be cellular” as in the human subject: an arrangement which allowed a communication be kept up between different parts of each lobe, as well as between different lobes. unter recognised the chorion and amnion. The decidua was thicker than in the uman subject. The allantois was absent. Hunter does not give the generic name this monkey, but Professor Owen calls it Macacus rhesus , and in the “Catalogue of the Museum of the Royal College of Surgeons” he points out that the filamentary fœtal villi include the capillary loops of the umbilical vessels; but instead of lying free in the alveolar cavities of the maternal placenta, they are connected or entangled with the fine cellular structure which receives the blood from the uterine arteries; the uterine veins have stronger and more definite coats than in the human placenta.

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