5 i8 



PISCES FISHES. 



FIG. 248. 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 ; 



