CHAP. XVI.] SOME OTHER MAMMALS. 285 



According to Owen, the convolutions of the lateral 

 aspect of the Hemispheres, around and above the ' fissure 

 of Sylvius,' are more undulating or interrupted and 

 therefore less neatly defined in the larger Herbivora than 

 among the larger Carnivora and Cetacea. This lack of 

 definition is, however, carried to an extreme degree in the 

 most richly convoluted brains of both types. 



