. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Kinds of Vertebrates 6?. Fig. 61. Representative rodents. A, squirrel, Sciurus; B, prairie dog, Cynomys. (Both after Dugmore.) c, flying squirrel, Sciuropterus. (After Lydekker.) d, beaver, Castor. (After Dugmore.) e, muskrat, Fiber. (After Carlin.) f, jumping jerboa, Dipus, of Europe. (After Beddard.) g, porcu- pine, Erethizon. (After Dugmore.) (6) primates.—The primates, including 39 living genera of lemurs, monkeys, apes, and mankind, while not so highl
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Kinds of Vertebrates 6?. Fig. 61. Representative rodents. A, squirrel, Sciurus; B, prairie dog, Cynomys. (Both after Dugmore.) c, flying squirrel, Sciuropterus. (After Lydekker.) d, beaver, Castor. (After Dugmore.) e, muskrat, Fiber. (After Carlin.) f, jumping jerboa, Dipus, of Europe. (After Beddard.) g, porcu- pine, Erethizon. (After Dugmore.) (6) primates.—The primates, including 39 living genera of lemurs, monkeys, apes, and mankind, while not so highly specialized in many ways with regard to bodily structure as the several orders yet to be mentioned, stand first in the vertebrate class with respect to brain development. Most of the 23 fossil genera of this order are lemurs, which probably dwelt in trees just as their modern representatives in the forests of Madagascar do to this day. There is considerable evidence that the primates arose from a primi- tive, tree-dwelling Insectivora stock. Practically all species living today are arboreal, with skeletons not greatly modified from the condition of primitive mammals. Their teeth, also, are comparatively unspecialized but tend to be reduced in number from the 11 pairs of teeth on each jaw of primitive. 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
