1909. | ANATOMY OF CERTAIN UNGULATA. 165 
Arteries of the base of the Brain.—\ figured in the ‘ Proceed- 
ings’ of this Society some years since* the chief arteries which 
form or are derived from the circle of Willis in Hyrax capensis. 
A number of the brains upon which I have just reported show the 
Text-fig. 10. 
Tateral view of the Sylvian region of eleven brains of Hyrax capensis. 
Figs. 1, 2, 3, &c. represent the left side. Figs. la, 2a, 3a, &e. the right side 
Each figure is bounded by the suprasylvian fissure above and the 
rhinal fissure below. 
cerebral arteries and enable me to amend in some particulars ana 
to confirm in others the figure and description referred to. I have 
there figured no communication between the basilar artery and 
* P.Z.S. 1904. vol. i. p. 187, text-fig. 18. 
