. Elements of Comparative Anatomy. Fig. 226. Cervical vertebra of Vultur cinereus. cCentrum. p Arch, s Spinous pro- cesses. CO Eudimen- tary rib. Eeptilia and Aves ribs are found along the whole of the dorsal portion of the vertebral column, and are absent only in the Chelonii. The movable cervical ribs of the Reptilia unite with the vertebra in the Aves (Fig. 226, co), and the two together bound a foramen trans versarium. In the caudal region of the column of the Saurii, Chelonii, and Crocodilini we meet with inferior arches, which are always attached be- tween two centra, and take part in th
. Elements of Comparative Anatomy. Fig. 226. Cervical vertebra of Vultur cinereus. cCentrum. p Arch, s Spinous pro- cesses. CO Eudimen- tary rib. Eeptilia and Aves ribs are found along the whole of the dorsal portion of the vertebral column, and are absent only in the Chelonii. The movable cervical ribs of the Reptilia unite with the vertebra in the Aves (Fig. 226, co), and the two together bound a foramen trans versarium. In the caudal region of the column of the Saurii, Chelonii, and Crocodilini we meet with inferior arches, which are always attached be- tween two centra, and take part in the forma- tion of a caudal canal. They are rudimentary in Birds. The inferior processes of the Ophidii, Saurii, and Aves, which are given ofE directly from the centra, are quite different from these. On comparing the vertebral column of the Reptilia and Aves with that of the Amphibia we can see that it is divided into a larger number of regions. A cervical and a lumbar region are more distinctly marked off, owing to the connection between a number of ribs and a sternum. The lumbar region con- tains the pre-sacral group of vertebrte, which have only short ribs; it is dis- tinct in the Saurii and Crocodilini. The absence of any sternal connections in the Ophidii is the cause of there being no difference between the tho- racic and cervical regions in these forms, as well as of the impossibility of distinguishing a lumbar one. In the Chelonii also the vertebrte of the trunk are similar in character through- out. These regions are not, however, very sharply marked off from one another, inasmuch as in the Saurii. 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 Gegenbaur, C. (Carl). London : Macmillan
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