. Elements of zoölogy : a textbook. Zoology. 114 VERTEBRATA: MAMMALIA, lience the Sirenia and Cetacea are sometimes grouped to- gether, and the group thus formed is called the Mutilata. The Sirenia, however, differ from the Whales in many respects, both in structure and in habits. The brain of the Sireuians is narrow; their neck is of moderate length, and its second vertebra has a tooth-like process; their only limbs, the forward ones, are moderately long, and flexed at the elbow; the mammae are upon the breast; they have molar teeth with flat crowns adapted for grind- ing vegetation, and have
. Elements of zoölogy : a textbook. Zoology. 114 VERTEBRATA: MAMMALIA, lience the Sirenia and Cetacea are sometimes grouped to- gether, and the group thus formed is called the Mutilata. The Sirenia, however, differ from the Whales in many respects, both in structure and in habits. The brain of the Sireuians is narrow; their neck is of moderate length, and its second vertebra has a tooth-like process; their only limbs, the forward ones, are moderately long, and flexed at the elbow; the mammae are upon the breast; they have molar teeth with flat crowns adapted for grind- ing vegetation, and have corresponding herbivorous habits. They inhabit the warmer parts of the ocean, near the shores, and often ascend large rivers. They even leave the water and crawl upon the shore to feed upon the fIG. Sea-Cow, Momatus. land vegetation; and this fact caused them to be called u Herbivorous ; They attain the length of ten to twenty feet. Some kinds of the Sirenians, as the Sea-Cows (Manatus),. 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 Tenney, Sanborn, 1827-1877. New York : Scribner
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