466 



MR. F. E. BEDDARD ON THE 



[Apr. 19, 



the muscles of the fore limb. In both Tupinambis and TiliqiM 

 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-fio-. 96. 



A. — Right carotid and aorta of Tupinambis nigropunctatus. 

 B. — Ditto of Iguana txiherculata, 



A, aorta; c, connection with carotid; C, carotid; D, branch of carotid to dorsal 

 musculature ; H, lingual artery ; V, branch of carotid (or lingual) to ventral 

 musculature. 



The ductus botalli between the carotid and the aorta is distinctly 

 larger in Tupinambis, as is also the branch of the carotid which 

 supplies the dorsal musculature of the neck and shoulder. The latter 



