110 



MR. F. E. BEDDARD ON THE 



[Feb. 7, 



the ophthalmic arteries. The first of these is the artery to each 

 optic lobe, which arises anteriorly to the junction between basilar 

 and carotid. The artery, after arising from the carotid, divides 

 at once into two ; these branches were of equal size on the left 

 side of the brain, but the posterior of the two was much the larger 

 on the right side of the brain. The two branches supply respec- 

 tively the antei'ior and posterior face of each corpus' bigeminum. 



Text-fig-. 18. 



Brain of Spheniscus demersus (ventral aspect), showing the principal branches 

 of the arterial system. 



Lettering as in text-fig. 15. 



The three following aiteries which arise from the carotid are the 

 posterior, middle, and anterior cerebral. Just in front of the 

 posterior cerebral is a smaller accessory trunk, which also supplies 

 the cerebrum. The chief trunk of the middle cerebral arteiy 



