4o 



THE O RIG IX OF VERTEBRATES 



MAMMALIA. 



REPTILIA. 



AMPHIBIA 





TELEOSTEA 



AMMOCCETES 



Fig.19.— Comi'abisok of Vertebeate Bbalns. 



CB., cerebellum ; FT., pituitary body ; PK., pineal body; C. STB., corpus striatum ; 

 G.H.B., right ganglion habenulse. I., olfactory; II., optic nerves. 



