. Text-book of zoology for schools and colleges. Zoology. 310 VERTEBRATE ANIMALS. are a number of small animals, characterized by the absence of canine teeth, and the possession of two long curved incisor teeth in both jaws, which are separated by a wide interval from the molars (Fig. 155). There are seldom more than two. Fig. 155.—a, Skull of the Beaver (after Owen); B, DiaOTfan of one of the incisor teeth of a Bodent, showing the chisel-shaped point, a Enamel; d Soft tooth-substance (dentine). incisors in the upper jaw (sometimes four), but there are never more than two in the lower jaw. The
. Text-book of zoology for schools and colleges. Zoology. 310 VERTEBRATE ANIMALS. are a number of small animals, characterized by the absence of canine teeth, and the possession of two long curved incisor teeth in both jaws, which are separated by a wide interval from the molars (Fig. 155). There are seldom more than two. Fig. 155.—a, Skull of the Beaver (after Owen); B, DiaOTfan of one of the incisor teeth of a Bodent, showing the chisel-shaped point, a Enamel; d Soft tooth-substance (dentine). incisors in the upper jaw (sometimes four), but there are never more than two in the lower jaw. The molar teeth are few in number (rarely more than four on each side of each jaw). The feet are usually furnished with five toes each. The most characteristic point about the Rodents is to be found in the structure of the incisor teeth, which are adapted for continuous gnawing. They grow from persistent pulps, and consequently continue growing as long as the animal 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 Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
