1905. ] ARTERIAL SYSTEM IN 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. 
‘ext-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 off, each of which joins one side of the circle 
already referred to. I should not like to lay undue stress upon 
the fact as absolutely characteristic of Pyfhon, since the arrange- 
ment was not obvious in one specimen through deficiency of 
injection. 
Proc. Zoot. Soc.—1905, Vou. II. No. V. 5 
