Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 FISHES. ORDER V.—PLECTOGXATHI. 333 In this group of peculiar forms, almost all of which are marine, the upper jaws are immovably united to the skull. Some are naked, others have the skin covered with spines or bony plates. The spiny forms (swellfish—fig. 134) can ™ - -- ^^^^^VCtfEFssTSS^*^ S. '-• • J*«* ~*--^t^ -::v>*** gg ,. -^v $|p^ - • ^~3^i '^^ ••.•'\:'-.:-''.ff *••,• FIG. 134.—Swellfish (Chilomycterus geometricus). After Goode. erect the spines by swelling out the body, and
Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 FISHES. ORDER V.—PLECTOGXATHI. 333 In this group of peculiar forms, almost all of which are marine, the upper jaws are immovably united to the skull. Some are naked, others have the skin covered with spines or bony plates. The spiny forms (swellfish—fig. 134) can ™ - -- ^^^^^VCtfEFssTSS^*^ S. '-• • J*«* ~*--^t^ -::v>*** gg ,. -^v $|p^ - • ^~3^i '^^ ••.•'\:'-.:-''.ff *••,• FIG. 134.—Swellfish (Chilomycterus geometricus). After Goode. erect the spines by swelling out the body, and thus gain additional protection. In the trunkfishes the bony plates unite to form a solid box. In the sunfishes of the ocean (fig. 135), which may weigh 1800 pounds, the body is almost circular in outline, and has a distinctly chopped- off appearance. ' As a whole, the order bears most re- semblance to the Acanthopteri. Xone are of the slightest economic importance. ORDER VI.—LOPHOBRANCHII. These are the most aberrant of bony fishes. The gills, as the name implies, are tufted, and composed of small rounded lobes packed in the gill-chamber. The oper- cular apparatus is reduced to a simple plate, the small, toothless mouth is at the end of a long snout, the skin is covered with bony plates arranged in rings around the
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