. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Kinds of Vertebrates 69 The Old World Anthropoids, known as the Catarrhines because the external nares are close together and usually open downward (cata, down), include three general types: the various African monkeys, macaques, and baboons; the anthropoid apes (belonging to the Family Simiidae) ; and man. These animals have opposable thumbs. Their teeth are reduced in number to 32. The tail is non-prehensile and frequently greatly reduced. Macacus is the
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Kinds of Vertebrates 69 The Old World Anthropoids, known as the Catarrhines because the external nares are close together and usually open downward (cata, down), include three general types: the various African monkeys, macaques, and baboons; the anthropoid apes (belonging to the Family Simiidae) ; and man. These animals have opposable thumbs. Their teeth are reduced in number to 32. The tail is non-prehensile and frequently greatly reduced. Macacus is the lively little monkey so often seen serving time behind the bars in zoological gardens and menageries. The rhesus monkey, Macacus rhesus, is used extensively in experimental work. The importance of this animal in work on the so-called Rh factor of the blood led to the use of the first two letters of Rhesus as the symbol for the Fig. 64. Anthropoid Primates, a, long-tailed monkey, Aluatta; b, gibbon, Hylobates; c, chimpanzee, Anthropopithecus; d, orang-utan, Simla; E, gorilla, Gorilla, (e, after Beddard; others, after Schmid.) The tailless Simians include four genera (Fig. 64). The gibbon {Hylo- bates) is a long-armed, arboreal form of small size, found in the Malay region and neighboring islands. The orang-utan (Simia), a native of Sumatra and Borneo, is also a long-armed arboreal type but is considerably larger than the gibbons. The chimpanzee (Anthropopithecus) and the gorilla (Gorilla), both African forms, have relatively shorter arms than the gibbon or orang. The chimpanzee, primarily an arboreal form,. 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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