. Elements of comparative zoology. Zoology. 380 SYSTEMATIC ZOOLOGY. from the fact that they bear upon the lower sides of the upper jaw hundreds of long parallel plates of so-called whalebone or baleen. These plates are fringed at the end, and the whole apparatus forms an efficient strainer, used in separating the small animals upon which these whales feed from the surrounding water. FIG. 167. — Section through the head T-t :<, of a whale one whale (after Boas),. showing ho-v the plates of baleen (w) are arranged on either side of the mouth-cavity (m). The true mnrnrrm'k bones are shown blac
. Elements of comparative zoology. Zoology. 380 SYSTEMATIC ZOOLOGY. from the fact that they bear upon the lower sides of the upper jaw hundreds of long parallel plates of so-called whalebone or baleen. These plates are fringed at the end, and the whole apparatus forms an efficient strainer, used in separating the small animals upon which these whales feed from the surrounding water. FIG. 167. — Section through the head T-t :<, of a whale one whale (after Boas),. showing ho-v the plates of baleen (w) are arranged on either side of the mouth-cavity (m). The true mnrnrrm'k bones are shown black. that tViP ! qrnnno- nomir TViP riVVit whales of the Arctic seas reach a length of sixty feet, the razor-back whales are still larger, wh:'le the sulphur bottoms and silver bottoms (so called on account of the color of the lower surface) attain a length of from 90 to 95 feet. ORDER VII.—SIRENIA (Sea-cows). These are whale-like animals, with the same flippers and the same horizontal tail, but they differ from the whales in the possession of an evident neck, and of sparse hair or bristles all over the body. Besides these features all, except the extinct Rytina, have flat-crowned molar teeth. The living forms are very few. Rytina, which lived near Bering Strait, was exterminated in the last century. The dugong is the representative of these forms in the Indian Ocean, while the three species of manatees come, one from Africa, the other two from the eastern coasts of America (fig. 168). All the sea-cows are vegetable feeders, living upon seaweed or, in the case of the manatees, upon the plants found in fresh-water streams as 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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