FiSHj Brain of the Fur Seal. 91 



iPLATE XII. 



Fig. I. The left jateral aspect of the cerebrum of the sea lion, Zalophus 

 calif ornianus . 



Fig. 2. The right lateral aspect of the cerebrum of Zalophus. 



^'S' 3- The mesal aspect of the right hemicerebrum. 



Fig. ^. The mesal aspect of the left hemicerebrum. 



Fig. 5. The left lateral aspect of the cerebrum of Ursus thibetianus. 



Fig, 6. The mesal aspect of the right hemicerebrum of Ursus. 



Fig. 7. Dissection of the left hemicerebrum of Callorhinus, showing the 

 lateral ventricle with a very rudimentary postcornu. 



Fig. 8. Dissection of the left hemicerebrum of Phoca vitulina, showing 

 the presence of the calcar and large postcornu in the lateral ventricle. 



Fig. g. Dissection of the right hemicerebrum of Monachus tropicalis show- 

 ing a postcornu of intermediate size. 



PLATE XIII. 

 Fig. I. The ventral aspect of the brain of a female Monachus tropicalis. 

 Fig. 2. The dorsal aspect of the brain of a female Monachus. 

 Fig. J. The left lateral aspect of the brain of a male Monachus. 

 Fig. 4. The right lateral aspect of the brain of a female Monachus. 

 P*S- 5' Tli« mesal aspect of the lefthalf of the brain of a female Monachus. 



