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Show 1 9 0 5 .] OF THE YELLOW-THROATED LIZARD. 2 6 3 some other Lizards, though they agree, as might be expected, in their main features. The first branch given off is a hyoid (hy, text-fig. 37), which supplies the hyoid region generally; I have not followed its branches minutely. In this region the carotid is in close contact with the systemic arch. Further dorsally they part company, and, shortly after this separation has occurred, the Text-fig. 37. Aortic arches and first part of dorsal aorta of Gerrhosaurus fiavigularis. Ca Carotid: q. Gastric; I.e. Vertebral artery; hy. Hyoid artery ; M. Muscular twig; as. (Esophageal branches; P. Pulmonary arch; Sci. Subclavian. main trunk of the carotid arises. The trunks are here so twisted that the carotid stem is given ofl posteriorly and dives under the carotid arch to reappear on its anterior face The.rest o the carotid arch is to be regarded as ductus Botalli. Fiom th s section arise two arteries : the first is a small muscular twig, the |
