. On the anatomy of vertebrates [electronic resource] . g. 98 B, 24,and, in the Emys, with the petrosal. The alisphenoid, 6, fig. 90,protects the side of the mesencephalon (optic lobe), is widelynotched anteriorly by the emerging divisions (2nd and 3rd) of thetrigeminal nerve, is perforated posteriorly by a filament of theacoustic nerve, where it joins the cartilaginous petrosal ; itarticulates above with the mastoid, 8, and parietal, 7, and infront with the orbitosphenoid, n. The anterior semicircularcanal is partly lodged in the cavity of the otocrane contributed 128 ANATOMY OF VERTEBRATES.
. On the anatomy of vertebrates [electronic resource] . g. 98 B, 24,and, in the Emys, with the petrosal. The alisphenoid, 6, fig. 90,protects the side of the mesencephalon (optic lobe), is widelynotched anteriorly by the emerging divisions (2nd and 3rd) of thetrigeminal nerve, is perforated posteriorly by a filament of theacoustic nerve, where it joins the cartilaginous petrosal ; itarticulates above with the mastoid, 8, and parietal, 7, and infront with the orbitosphenoid, n. The anterior semicircularcanal is partly lodged in the cavity of the otocrane contributed 128 ANATOMY OF VERTEBRATES. by the alisphenoid. Thus in the bone 6, we have all the charactersof that so numbered in figs. 81, 83, and 85, and called ali-sphenoid in the fish. The chief modification is due to the greaterdevelopement of 3, fig. 90, in Chelonia, which overlaps 6 as wellas 2. The parietals, figs. 90, 91, are united, as in Cyprinoid andGanoid fishes, by the sagittal suture, and are much expanded bothtransversely and longitudinally, overlapping, in the Turtle, the 91. Skull of Turtle {Chelone my das) superoccipital, fig. 90, 3, and articulated with it and the mastoids,fig. 91, 8, behind; and with the frontals, ib. n, before. Eachparietal, also, sends down a long vertical plate, 7, fig. 90, whichunites with the alisphenoid, 6, and orbitosphenoid, 10, this ossifica-tion taking the place and function of the latter neurapophyses infishes. The bone, figs. 89, 91,8, which articulates with the paroccipital4, parietal 7, and postfrontal 12, which affords the surface of attach-ment to the upper end of the tympanic 28, enters into the for-mation of the acoustic chamber in some Emydians, and projectsoutward and backward to give insertion to the latissimus colliand trachelomastoideus, repeats the chief and essential charactersof the bone so numbered, and called (mastoid in Fishes, figs. 75,76, 83, 85,8: and forms the transverse process of the parietalvertebra. The forward continuation of the vertebral bod
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Keywords: ., bookcentury1800, booksubject, booksubjectbirds, booksubjectfishes
