490 



PISCES— FISHES. 



Fig. 206, — Dissection of nerves of skate. 

 CH., cerebral hemispheres; O.TH., optic thalami ; OL., optic 

 lobes; M., medulla ; 4V., posterior part of cerebellum, covering 

 fourth ventricle ; OB., olfactory bulb ; OC, olfactory capsule ; 



