. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 120 COMPARATIVE ANATOMY tympanic cavity, and the Eustachian canals open into the pharynx by a median aperture behind the internal nostrils. The hyobranchial skeleton is much reduced, and consists of a body with a single pair of cornua: it is not known whether these belong to the hyoid or to the first branchial arch [Birds. As already mentioned, the skull of Birds is formed on a similar plan to that of Reptiles—more particularly of Lizards, but it exhibits certain special characteristics (Figs. 87 and 88). In correspondenc
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 120 COMPARATIVE ANATOMY tympanic cavity, and the Eustachian canals open into the pharynx by a median aperture behind the internal nostrils. The hyobranchial skeleton is much reduced, and consists of a body with a single pair of cornua: it is not known whether these belong to the hyoid or to the first branchial arch [Birds. As already mentioned, the skull of Birds is formed on a similar plan to that of Reptiles—more particularly of Lizards, but it exhibits certain special characteristics (Figs. 87 and 88). In correspondence with the higher type of brain, with its well developed cerebral hemispheres, the brain-case is relatively Interorl}. septum Prefont (lac.) Squamosal ^ aritt. Dent. And. caps Pteryr/. Supra- Ang. " Paraiph. Ang. § «» 5 *"* » FIG. ST.—-SKULI, OF AX EMBRYO CHICK 65 MM. IN LENGTH. From the right side. (From a model b\- W. Toukoflf, x i). Cartilage, l/>n : investing bones, yellmo. Prentax. large, and correlative modifications occur, especially in the occipital and auditor}- regions. The relatively large size of the eyes, moreover, has resulted in a limitation of the cranial cavity in an anterior direction and in the expansion of the brain laterally and. 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, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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