compared with that of Man. 297 



a posterior. The hemispheres are evidently smaller in proportion 

 than in man, for they do not cover the cerebellum completely. 



3. The brain of the dolphin is comparatively much broader 

 than that of man, while the contrary is the case in the other 

 mammiferous animals. The shortness of the brain in the dol- 

 phin is probably connected with the absence of olfactory nerves. 



4. The cerebral hemispheres of the dolphin present much 

 more numerous circumvolutions and grooves than those of any 

 other animal. They are even proportionally more numerous 

 than in man. In the latter, also, their arrangement is not sym- 

 metrical, contrary to what is observed in all other animals. 



5. The lateral ventricles are composed in the dolphins, as in 

 man and the monkeys, of three horns, an anterior, a middle, and 

 a posterior ; while two horns only are met with in the other 

 mammifera. 



6. The mammillary eminences are blended into a single mass, 

 as in most of the other mammifera. Man, and the orang-outang, 

 on the contrary, present two distinct eminences. 



7. The three pillared vault, the cerebral partition, the cornua 

 ammonis, and the corpora striata, are, with relation to the brain, 

 smaller in the dolphin than in man. 



8. The quadrigeminous tubercles form, as in the other mam- 

 mifera, larger masses than in man. 



9. The cerebellum is distinguished by being proportionally 

 larger than in man, and its middle part is not symmetrical, as 

 in seals, and several other animals. 



10. The medulla oblongata has not the trapeze, as in man 

 and the orang-outang. 



11. The brain of the dolphin is essentially distinguished from 

 that of man and all the other mammifera, by the absence of ol- 

 factory nerves. The other cerebral nerves compared, with re- 

 gard to size, with the volume of the brain, and the brain of the 

 dolphin being compared with the base of the brain and with the 

 nerves of man, are much larger than in man. This, therefore, 

 affords an additional confirmation of the important proposition 

 of Soemmering, that man possesses the largest brain, in propor- 

 tion to the size of its nerves. 



The remarkable developement of the brain in the dolphin, a 

 developement which gives it, in this respect, a rank immediately 



