| OCR Text |
Show 1905.] ARTERIAL SYSTEM IX SAUROPSIDA. 65 form. In one of the two specimens at my disposal, I could not see very well the actual mode of junction of the vertebral arteries with the basilar. In the other it was plain and very complicated. The basilar artery itself divides and immediately reunites, thus forming a circle; the two vertebrals join below this circle, and from the lower surface of this transversely running trunk two Text-fig. 18. Text-fig. 19. Text-fig. 18.- Tupinambis nigropunctatus. Ventral aspect of brain, showing chief arteries. Lettering as in text-fig. 16. Text-fig. 19.- Python molurus. Ventral aspect of brain, showing chief arteries. v. Vertebral arteries. Other letters as in text-fig. 16. To the right of the figure is an enlarged representation of the junction ° of the vertebral arteries with the basilar. branches are given oft*, each of which joins one side of the circle already referred to. I should not like to lay undue stiess upon the fact as absolutely characteristic of Python, since the arrangement was not obvious in one specimen through deficiency of injection. P r o c . Z o o l . Soc.-1905, V o l . II. No. Y. 5 |
