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- 

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



FIG. 316. 



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

 a. Vermiform process, or middle lobe of i. Optic Thalamus. 



the Cerebellum. g. Hippocampus Major. 



6. Corpus Callosum. n. Tasnia Hippocampus ( unusually broad ). 



c. White fibrous matter. p. Posterior Cornu. 



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



FIG. 317. 



FIG. 317 Base of Brain of Dolphin (Delphinus Delphis) ( Owen.) 



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

 in Cetacea ). 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 quadrumana, as in the 

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



