| OCR Text |
Show 4 MR. W. F. R. WELDON ON THE PLACENTATI Diffuse ridges of the placenta of Tetraceros quadricornis. resembling those ridges which form in the Pig the whole placental apparatus. The velvety appearance, due to these folds, is more or less successfully represented in fig. 3 ; while a view of the chorion under a low magnifying-power is shown in fig. 4, where it is seen that the vascular ridges form an irregular network, into the meshes of which, between the ridges, open the numerous uterine glands (fig. 4, u.gl.). It will be seen, from what has been said, that this placenta is exactly intermediate in structure between the completely diffuse placenta of Moschus on the one hand, and the complex cotyledonary apparatus, of the Sheep for example, on the other. Tetraceros therefore stands, as far as its placenta is concerned, in the same place in the Antelope series as that occupied by Cervus mexicanus in the Cervine series. |
