THE BRAIN OF THE FUR SEAL, CALLORHINUS 

 URSINUS; WITH A COMPARATIVE DESCRIP- 

 TION OF THOSE OF ZALOPHUS CALIFORNIAN- 

 US, PHOCA VITULINA, URSUS AMERICANUS 

 AND MONACHUS TROPIC ALIS.* 



By Pierre A. Fish, D. Sc, D. V. S. 



iV. V. State Veterinary College, Ithaca, N. Y. 

 With Plates X to XIII. 



TABLE OF CONTENTS. 



Introduction, 58 



Removal of dura, .......... 59 



Terminology, .......... 60 



CaLLORHINUS URSINUS 61 



Lateral aspect, .......... 62 



Mesal aspect, ........... 66 



PlIOCA VITULINA, 68 



Lateral aspect, .......... 68 



Mesal aspect, .......... 71 



URSUS AMERICANUS, 72 



Lateral aspect, .......... 7^ 



Mesal aspect, 74 



Zalopiius californianus, 75 



Lateral aspect, .......... 75 



Mesal aspect, ^(> 



FissuRAL interpretations of other writers, 77 



The LATERAL ventricle (paracoele), 78 



MoNACHUS TROPICALIS 8l 



General considerations, 84 



Description of plates, 91 



*This article was written at tlie request of a member of the Bering Sea 

 Commission and will appear in their Report of the Bering Sea Fur vSeal Investi- 

 gations. 



