1905.] ARTERIES OP THE BRAIN IN BIRDS. 103 



the descriptions which follow. This brain is illustrated in the 

 accompanying drawing (text-fig. 15), the accuracy of which can 

 be tested by a reference to the actual specimen, which I have 



Text-fig. 15. 



H.mi 



Bi'iiin of Sinifhio masaicus (ventral aspect), showing the principal branches 

 of the arterial system. 



Axe): Anterior cerebral artery ; A.sp. Anterior spinal artery ; C. Cerebellar arteries ; 

 Ca. Carotid arteries; M.cer. Middle cerebral artery; Op. Artery to optic lobe; 

 Opth. Ophthalmic artery; P.cer. Posterior curebral artery. 



