PLATE VIII. 



Brain of Elephant Seal. 



The fissures, convolutions, and other divisions of the brain, both in this and the succeeding Plates, are lettered as below : 



I. olfactory. 

 II. optic. 



III. motor oculi. 



IV. trochlearis. 



Fig. 1. Superior surface of the brain of Macrorhinus leoninus. The clotted outline 

 represents the form of the brain as taken from a cast of the cranial cavity. 



Fig. 2. Inferior surface of the same brain. 



Fig. 3. Profile view of the right hemisphere of the same brain. 



The above figures were drawn from nature by T. W. Dewar, M.B. 



Fig. 4. Superior surface of the brain of a fcetal Phoca grcenlandica, with the pia mater 

 not stripped off. 



Fig, 5. Vertical transverse section through the right hemisphere and lateral ventricle 

 of the cerebrum of brain a of the Walrus, ecl, corpus callosum forming the 

 roof of the lateral ventricle ; cs, corpus striatum. 



Figs. 4 and 5 were drawn from nature from my dissection by Professor 

 Eichard Caton. 



