. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. S2 Biology of the Vertebrates (5) crocodilia.—The crocodiles are, in a number of respects, the most advanced of the reptiles. Their lungs are very efficient organs. Their heart has two completely separate ventricles, a condition found also in birds and mammals. The brain has large cerebral hemispheres. The Crocodilia include the crocodiles proper of India, China, Africa, the Malay Archipelago, Central America, Mexico, and the southeastern United States; th
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. S2 Biology of the Vertebrates (5) crocodilia.—The crocodiles are, in a number of respects, the most advanced of the reptiles. Their lungs are very efficient organs. Their heart has two completely separate ventricles, a condition found also in birds and mammals. The brain has large cerebral hemispheres. The Crocodilia include the crocodiles proper of India, China, Africa, the Malay Archipelago, Central America, Mexico, and the southeastern United States; the broad-snouted alligators of the Mississippi Basin, Florida, and China (Fig. 46) ; the caimans of Central and South America; and the narrow-snouted gavials of the Ganges in India. All are in- habitants of tropical or semi-tropical coun- tries and, though clumsy and stiff-necked on land, are quite at home in shallow water, where their powerful laterally compressed tails enable them both to swim forward and to strike powerful side blows. 5. Class AVES. Fig. 45. Texas rattlesnake, Cro talus. (After Stejneger.) All birds, of which there are perhaps 15,000 species, have feathers. This one con- spicuous characteristic suffices to identify a bird, even to a child, for no other animals have feathers. The vertebrate type probably reaches its highest differentiation, in certain directions at least, in birds, and for this reason it is not at all difficult to find many other dis- tinguishing characteristics, aside from feathers, in this familiar and much studied class of 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
