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Show 1900.] SOFT ANATOMY OF THE MUSK-OX. 15l between the reticulum and psalterium are some conical papilla?, but not enlarged or curved as is usually the case in Bos. The psalterium-groove is also bordered by rows of conical papillae like those of the psalterium-folds. The opening to the abomasus is surrounded by two semilunar plica?, which are continued in the longitudinal folds of this organ. The number of the abomasus-folds of Ovibos is 24, many more than in Bos (14-16), Ovis (13-15), Capra (13), or Capreolus (11-12). But the folds are not very broad, at most about 3 cm. The length of the abomasus measured along the curvature is 48 cm., and its greatest breadth when lying flat and empty about 15 cm. The folds disappear 24 cm. from the pylorus. In Ovis, Capra, Capreolus, &c. the plicated part of the abomasus is much longer than the nonplicated. Ovibos has been able to shorten the plicated tract by augmenting the number of laminar folds. Towards tbe pylorus the musculature is strengthened, and forms a strong sphincter with a round button on the anterior side. Fig. 6. Irregular folds in the caBcum of the Musk-ox. The first part of the duodenum, which is suspended in the omentum majus, is rather dilated, and measures 4 cm. in width, when it lies empty, but when it approaches the liver, 20 cm. from the pylorus in the omentum minus, it is narrowed to 3 cm. Free from this it makes a short loop about 10 cm. in length, after which it Abends backward and forms another loop 33 cm. in length along the rectum, to which the ascending part is attached by a mesentery 4-5 cm. in breadth. Having returned forward, it becomes the jejunum, with its numerous short convolutions in the periphery of the mesentery. The last part of the small intestine is again straight, and attached to the caecum by a narrow mesentery. The ileum terminates by a 10-13 m m . broad circular valvula ileo-ccecalis. In the fundus end of the caecum of Ovibos several irregular folds are found. These are especially numerous on a spot a little more than 3 cm. in diameter, where some of the folds are 5 m m . broad. They appear to be irregularly arranged (see fig. 6). Here, too, the |