PLATE IX. 



Elephant Seal and Walrus. 



Fig. 1. Anterior end of the cerebrum of Macrorhinus leoninus. The olfactory bulb is 

 turned down on one side to show the olfactory and prsecruciate fissures and 

 ursine lozenge. Drawn from nature by T. W. Dewar, M.B. 



Fig. 2. Tentorial and inner surfaces of the left hemisphere of the same brain, obtained 

 by making an antero-posterior mesial section through the corpus callosum. 

 Drawn from nature from my dissection by K. M. Scott, M.B. 



Fig. 3. Tentorial and inner surfaces of the left hemisphere of the Walrus (brain a.) 

 This and fig. 4 were drawn from nature from my dissection by Professor 

 Richard Caton. 



Fig. 4. View of the floor of the lateral ventricle and the descending horn in the right 

 hemisphere of the cerebrum of the Walrus, obtained by removing the corpus 

 callosum. 



