Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 FIG. 105.—Skull of cod. (After Hertwig.) The dotted portion is the pterygo- quadrate arch and is equivalent of the upper jaw of the shark (Fig. 104). FIG. 106.—Diagram (after Wiedersheim) showing the relation of permanent structures (dark) to the gill-arches of the embryo (dotted), h, hyoid arch; I, cartilages of larynx; I, II, III, gill-bars. At the front of h and I is shown in black the hyoid bone of the adult, with its two horns; behind the ear, at the other end of the hyoid arch,
Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 FIG. 105.—Skull of cod. (After Hertwig.) The dotted portion is the pterygo- quadrate arch and is equivalent of the upper jaw of the shark (Fig. 104). FIG. 106.—Diagram (after Wiedersheim) showing the relation of permanent structures (dark) to the gill-arches of the embryo (dotted), h, hyoid arch; I, cartilages of larynx; I, II, III, gill-bars. At the front of h and I is shown in black the hyoid bone of the adult, with its two horns; behind the ear, at the other end of the hyoid arch, is (black) a piece (styloid process) which joins the skull. are but modified gill-bars. With the disappearance of gills in the higher vertebrates the branchial arches tend
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