. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. THE SKULL 79 premaxilla vary much as to their development: the latter may even be absent. Besides the above-mentioned bones in connection with the palatoquadrate bar, the cranial capsule of Teleosts is sur- rounded by other outworks consisting of bony plates and bars. These arise as true dermal bones in the region of the eyes (orbital ring), and in the gill-covers (opercular bones): the latter are similar in number and name to those of bony Ganoids. A large number of sphot 'par. Fig. 60.—Cranial Skeleton*' of the iSalm
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. THE SKULL 79 premaxilla vary much as to their development: the latter may even be absent. Besides the above-mentioned bones in connection with the palatoquadrate bar, the cranial capsule of Teleosts is sur- rounded by other outworks consisting of bony plates and bars. These arise as true dermal bones in the region of the eyes (orbital ring), and in the gill-covers (opercular bones): the latter are similar in number and name to those of bony Ganoids. A large number of sphot 'par. Fig. 60.—Cranial Skeleton*' of the iSalmon. (From the left side.) Pmx, premaxilla ; aih, supraethmoid ; nas, nasal; mx, maxilla; jiiij, jugal; pt, pterygoid ; mpt, mesopterygoid ; mtpt, metapterygoid ; Quad, quadrate ; , hyom, hyomandibular; p"^, palatine; fr, frontal; u, o, o, o, orbital ring; ^ar, parietal; sphot, sphenotic ; tpiot, epiotic ; pttr, pterotic ; socc, supraoccipital; op, operculum ; prcKop, preoperculum ; intop, interoperculum ;- subop, suboperoulum ; branchiont, branchiostegal rays ; dent, dentary ; art, articular; Zunge, tongue. branchiostegal rays are developed in the ventral part of the- oper- cular fold, or branchiostegal membrane (Fig. 60). Anteriorly, the opercular apparatus lies against a bony chain consisting of three pieces—the hyomandibular, symplectic, and quadrate—which serves as a suspensorial apparatus for the lower jaw (Fig. 60). The latter consists of Meckel's cartilage and of several bony elements, the largest of which is the dentary:. 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 Wiedersheim, Robert, 1848-1923; Parker, William Newton, 1857-1923. London, Macmillan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
