Comparative Anatomy of the Brain. 593 



extremity of the coronal fissure No. 12, making it almost transverse in- 

 stead of longitudinal, as seen in the carnivores and some of the ungu- 

 /ates, figs. 313, 323, &c. The mastoid, or middle lobe, of the ungulates 



FIG. 316. 



PIG. 316. Horizontal section of the Brain of the Dolphin. 

 (/.Vermiform process, or middle lobe of L Optic Thalamus. 



the Cerebellum. a. Hippocampus Major. 



b Corpus Callosum. n. Taenia Hippocampus ( unusually broad ). 



c. White fibrous matter. p. Posterior Cornu. 



d, &. Corpus Striatum. ( Good's Book of Nature.) 



FIG. 317. 



FIG. 317. Base of Brain of Dolphin (Delphinns Delphi*.) ( Owen.) 



e. Lateral lobes of Cerebellum ( very large /".Oblique lobule or Amygdaloid lobe. 

 inCetacea). h. Floccus of Reil origin of Auditory nerve 



is thus, in these animals, thrown from a diagonal to a nearly transverse 

 position between the coronal fissure 12 as its anterior boundary, and the 

 lambdoidal 13 as its posterior limit. In the quadrmr.jma. as in the 

 other orders of the gyrencephala, the smallest members have brains al 



