PISCES. 29 



PLATE X, 



THE SKATE. 



(EAIA BATIS.) 



FIG. I. 



THE DOKSAL ASPECT OF THE BRAIN AND SPINAL 



COED. 



a. -ANTERIOR lobes of the brain, b. Pedicles of the anterior lobes, corresponding 

 with the crura of the brain, c. Optic lobes, d. Cerebellum, e. Nose. 



1. Olfactory nerve ; it arises, or is continued from the anterior lobe ; it passes out 



of the cavity of the skull, and forms a long ganglion over the nose, which 

 gives off numerous branches to pass through holes in the membrane, 

 corresponding with the cribriform plate of the ethmoid bone, to the mem- 

 branous plaits or folds of the nose. 



2. Optic nerve. 



3. Third nerve passing to all the muscles of the eye, except the superior oblique 



and the abductor. 



4. Fourth or pathetic nerve : it arises just beyond the posterior point of the optic 



lobe. 



