Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 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
Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 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 Harger.
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