. Elements of comparative zoology. Zoology. 230 SYSTEMATIC ZOOLOGY. There are two subdivisions of Tetradecapods: Isopoda and Amphipoda. In the Isopods (fig. 57) the body is depressed, as in the sow-bug, and the gills are borne under the abdomen. Most of the Isopoda feed upon decay- ing matter, but some have become parasites upon other animals, and have consequently so changed their appearance that one knowing only the adult would never regard them as Isopods at all. But the young settle the question, since before they begin their parasitic life they are regular Isopods. In the Amphipods (fig.
. Elements of comparative zoology. Zoology. 230 SYSTEMATIC ZOOLOGY. There are two subdivisions of Tetradecapods: Isopoda and Amphipoda. In the Isopods (fig. 57) the body is depressed, as in the sow-bug, and the gills are borne under the abdomen. Most of the Isopoda feed upon decay- ing matter, but some have become parasites upon other animals, and have consequently so changed their appearance that one knowing only the adult would never regard them as Isopods at all. But the young settle the question, since before they begin their parasitic life they are regular Isopods. In the Amphipods (fig. 58) the body is compressed from side to side, and the gills are borne on the thoracic region between the legs. These forms are familiar to all visitors to the shore under the. FIG. 57.—Marine Isopod (Idotea irrorata). After 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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