428 DISSECTION OF THE PIGEON 



force^ps the outer spongy layer of bone, until the shape of the 

 organ can be clearly seen. 



a. The anterior vertical semicircular canal lies, 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 hes 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. 



