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Show 466 MR. F. E. BEDDARD ON THE [Apr. 19, the muscles of the fore limb. In both Tupinambis and Tiliqua the aortic arches and their branches can be plainly seen from the interior of the body-cavity. In Iguana, on the other hand, the branching of the carotid takes place partly in the thickness of the parietes owing to the narrowness of the "chest" of this Lizard. There are, moreover, slight differences in these branches, as is to be seen in the annexed drawing (text-fig. 96). Text-fig. 96. A.-Right carotid and aorta of Tupinambis nigropunctatv.s. B.-Ditto of Iguana tuberculata. larler ttZ |~"£. *"*"?* *hecf otid^d the aorta is distinctly larger inTupinambis, as is also the branch of the carotid which supplies the dorsal musculature of the neck and shoulder. The ktter |