. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 134 COMPARATIVE Fig. 103.—Vertical Section (middle digit): 1, 2, 4, proximal, middle, and distal or nugual, phalanges; 3, sesamoid, or unt-bone; 5, C, 7, tendons; 9, elastic tissue; 8,' 10, internal and external floor of the hoof; 11, 12, internal and ex- ternal walls. Beaver and Rat, have the same stnictnre. Nails are flattened horny j^lates developed from the npper surface of the fingers and toes. Claws are sharp conical nails, being developed from the sides as well as upper surface; and hoo
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 134 COMPARATIVE Fig. 103.—Vertical Section (middle digit): 1, 2, 4, proximal, middle, and distal or nugual, phalanges; 3, sesamoid, or unt-bone; 5, C, 7, tendons; 9, elastic tissue; 8,' 10, internal and external floor of the hoof; 11, 12, internal and ex- ternal walls. Beaver and Rat, have the same stnictnre. Nails are flattened horny j^lates developed from the npper surface of the fingers and toes. Claws are sharp conical nails, being developed from the sides as well as upper surface; and hoofs are blunt cylindrical claws. Hollow horns, as of the Ox, may be likened to claws ,; sheathing a bony case. The horn of the Rhinoceros is a solid mass of epidermal fibres. " Whale- bone," the rattles of the Rattle- snake, and the beaks of Turtles and Jjirds, are likewise epidermal. Hairs, the characteristic clothing of Mammals, are elongated horny cones, composed of "pith" and The scales of Snakes and Lizards are horny epiderm- ic plates covering the overlapping folds of tlie true skin. In some Tur- tles these plates are of great size, and are called " tor- toise - shell;" they cover the bony f the Forefoot of the Horse dcmial platCS. The scales on the legs of Birds, and on the tail of the. 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 Orton, James, 1830-1877. New York, Harper and brothers
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