B Tragulidae. This group comprises certain small Ruminants, the so-called "Chevrotains " (Tragulus), which have been generally associated with the true Musk-deer (Moschus) in a single family, under the name of Moschidae. The researches of Milne-Edwards and Flower, however, would prove that Moschus itself is really one of the Cervidae or Deer proper, and that the Chevrotains form a group by themselves.

The Tragulidae are characterised by the total absence of horns in both sexes, and by the presence of canines in both jaws, those in the upper jaw being in the form of tusks in the males, but much smaller in the females. The third stomach, or "psalterium," is wanting, and the placenta is diffuse. The feet have supplementary toes, and the metacarpals of the middle and ring digits either unite in late life to form a canon-bone, or remain (as in Hyomoschus) permanently separate.

The family includes at the present day only the Hyomoschus of Western Africa, and some four or five species of Tragulus from the Indian province. The best known are the Tragulus Javanicus, or "Napu" of Java, and the T. meminna of

Fig. 408.   Side view of the skull of Tragulus favanicus. (After Giebel.)

Fig. 408. - Side-view of the skull of Tragulus favanicus. (After Giebel.)

India. They are all very small elegant animals, and, though commonly called "Musk-deer," they have no musk-gland.