416 DISSECTION OF THE PIGEON 



a. The anterior vertical semicircular canailles, in the 



natural position of the parts, close alongside the 

 posterior border of the optic lobe and the side of 

 the cerebellum. 



b. The posterior vertical semicircular canal lies 



almost immediately below the anterior vertical 

 canal. 



c. The horizontal semicircular canal lies opposite the 



lower border of the optic lobe, and the hinder 

 end of the cerebellum. 



