. Comparative anatomy and physiology. Chap. IX.] HAIRS OF MAMMALS. 369 account of their arrangement in different forms. Hair is almost entirely absent from the body of adult Cetacea, and only scantily developed in the Sirenia; this common character must not, however, be regarded as any evidence of community of origin or closeness of relationship, but rather as the result of exposure to similar conditions. Sometimes, when the hair is. Fig. 157.—The Armadillo. scanty on the body, as in the rhinoceros, a number of hair-like shafts unite to form a horn. In forms which live in very cold climates, l
. Comparative anatomy and physiology. Chap. IX.] HAIRS OF MAMMALS. 369 account of their arrangement in different forms. Hair is almost entirely absent from the body of adult Cetacea, and only scantily developed in the Sirenia; this common character must not, however, be regarded as any evidence of community of origin or closeness of relationship, but rather as the result of exposure to similar conditions. Sometimes, when the hair is. Fig. 157.—The Armadillo. scanty on the body, as in the rhinoceros, a number of hair-like shafts unite to form a horn. In forms which live in very cold climates, like the musk-sheep (Ovibos moschatus), the hair is exceedingly long and thick, and serves as an efficient protection against the external cold; the most striking example of this is afforded by the thick coating of the extinct mammoth, which lived in cold regions, whereas its allies, the elephants, which, in recent times, are confined to warm coun- tries, have but little hair. The soft hair may be replaced by firm and strong spines, as in the porcu- pine or hedgehog, where, thanks to their power of y—16. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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