134 THE ANATOMY OF VEETEBEATED ANIMALS. 



Fig. 37. 



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Fifr. 37. -The brain of the Skale (JRaia hatis). A. From above 

 B. A portion of the ventral aspect enlarged :— s, the olfactory bulbs 

 a, the cerebral hemispheres which are united in the middle line 

 6, the thalamencephalon ; c, the mesencephalon ; cl, the cerebellum, 

 aa, the plaited bands formed by the corpora resliformia; I., 11.^ 

 IV., v., the cerebral nerves of the corresponding pairs ; /, the me- 

 dulla oblongata ; w, a bloodvessel. In B. : ch, the ciiiasma of 

 the optic nerves ; h, the pituitary body ; n and v, vessels connected 

 with it; k, the saccus vascvlosvs ; p, the pyramids of the medulla 

 oblongata. 



