. Principles of economic zoo?logy. Zoology, Economic. 330 BRANCH CHORDATA animal found in Ethiopia, Africa, and Arabia, including Palestine.' It is sometimes called the "rock-rabbit," since the most species live among rocks and mountains, and their squatty attitude, short tail, and split muffle, as well as a pair of rodent-like incisors in the upper jaw, remind one of the rabbit. They have no canine teeth. Some species are found upon the trunks and large branches of trees, and sleep in the hollows of trees. The skull shows affinity with the Perissodactyles and also with the rodents.
. Principles of economic zoo?logy. Zoology, Economic. 330 BRANCH CHORDATA animal found in Ethiopia, Africa, and Arabia, including Palestine.' It is sometimes called the "rock-rabbit," since the most species live among rocks and mountains, and their squatty attitude, short tail, and split muffle, as well as a pair of rodent-like incisors in the upper jaw, remind one of the rabbit. They have no canine teeth. Some species are found upon the trunks and large branches of trees, and sleep in the hollows of trees. The skull shows affinity with the Perissodactyles and also with the rodents. The ears are short and the body fur covered. The clavicle is absent, the radius and ulna complete, but often ankylosed. The hyrax has a greater number of trunk vertebrae than any other mammal, twenty-one or twenty- two of them bearing ribs. The hyrax differs from all other mammals in having, in addition to the ordinary cecum, a pair of supplementary ceca situated some distance down the large intestine. The Elephant (Proboscid'ea).—The skin is greatly thickened and scantily covered with hair. There is a tuft of hair on the end of the tail. The mass- ive, stiff limbs are quite free from the body. The nose and upper lip^ are produced into a long, flexible, muscular, prehensile trunk or proboscis (Fig. 269), at the end of which the nares are situated. There are five complete digits on both fore and hind limbs, and though they are bound together in. Fig. 208.—Hyrax syriacus. the integument, each is encased in a separate hoof. The skull is very large, but the bones are rendered light by their numerous air cavities. The brain- case is small in comparison with the size of the skull, as the bones are enormously thickened. In some specimens the bony skull wall is greater in diameter than the cranial cavity, the frontal bones in older animals some- times reaching the thickness of one foot. In existing forms there is a single pair of upper incisors, which develop into long tusks of sol
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