. Principles of economic zoo?logy. Zoology, Economic. MAMMALIA 325 The different forms are distinguished chiefly by the number of the movable bands of "scutes" between the anterior and posterior shields. The Uttle Chlamydoph'orus, of about 5 inches in length, has no movable bands at all, the series of plates being uniform and continuous even to the neck. The con- spicuous external ears so prevalent among the armadillos are also absent. Tolypcu'tcs can roll itself up into a ball and be protected by its armor, or roll away from its enemies. Its walking is digitigrade and it is called &
. Principles of economic zoo?logy. Zoology, Economic. MAMMALIA 325 The different forms are distinguished chiefly by the number of the movable bands of "scutes" between the anterior and posterior shields. The Uttle Chlamydoph'orus, of about 5 inches in length, has no movable bands at all, the series of plates being uniform and continuous even to the neck. The con- spicuous external ears so prevalent among the armadillos are also absent. Tolypcu'tcs can roll itself up into a ball and be protected by its armor, or roll away from its enemies. Its walking is digitigrade and it is called "; Armadillos are omnivorous, and one species {Das'ypus sexcinc'tiis) is especially fond of carrion, burrowing up to a carcass lilce bee- tles. The limbs of armadillos are short, powerful, and cla\\ed, enabling them to dig rapidly in the Fig. 265.—Nine-banded armadillo (Das'ypus novenicinc'lus). (Liitken.) Order IV. Sire'nia.—These are dark-colored, sparsely haired or bristly, toothed, herbivorous mammals. The elongated snout of the whale is replaced by large movable lips for grasping the food, which consists of seaweed and other aquatic plants. External ears and hind limbs are absent. The anterior limbs are flipper-like, but more flexible than those of the whale, and the mother sometimes holds the young under her arm. The tail is horizontal. Sirenia grow to a length of 9 or 10 feet. They have two sets of heterodont teeth. The dugong (Fig. 266) is sparsely covered with stout hairs. The thick skin is underlaid with blubber. It is found on the east coast of Africa, in the Indian Ocean, and the north coast of Australia, and in the Red Sea. The manatee is found on the Atlantic coast of South America and of Africa, and in the mouths of the large rivers of these countries. The blubber in the manatee differs from that of the whale in that it has no free oil. Steller's sea-cow, the recently extinct Rhyti'na, was found in herds in Behring Sea. It reached
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