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Show 1900.] SOFT A N A T O M Y O F T H E MUSK-OX. 143 bare fissure (philtrum) extending from the naked area between the nostrils over the upper lip, which is so characteristic of the Sheep and their allies. With regard to shape, the muzzle of Ovibos is more flat and broad, and its nostrils are wider apart than in the Sheep, although closer than in an Ox. The nostrils are not so widely open as in an Ox, and not so closed by the upper flap as in the Sheep. Both upper and lower lips (fig. 1) are anteriorly broad and beset Fig. 1. B Upper (A) and lower (B) lips of the Musk-ox. with hard warts ; this warty area being in an adult bull about 2 cm. broad and 1\ cm. long. The warty areas of the lips work against each other as the jaws of a pair of pincers, and are apparently well fitted for seizing the food. The Musk-ox thus browses with its lips. The mouth is square, but must be called small, as the distance from the anterior angle to the corner of the mouth is not more than 7| cm., or the same as the breadth of the lips anteriorly. The palatal ridges (rugcv palati), fig. 2, are 13-14 pairs in addition to the first undivided one. They are often irregular, so that in some |