22 



MR. ST. OBOEGE MIYART ON" THE 



the anterior end o£ tlie cerebrum, there seemed at first to 

 be no indication of an Ursine lozenge. By slightly separating 



Kg. 9. 



Vertical median section of part of the brain of Phoca vitulina, natural size. 



C. Crucial sulcus. Cm. Calloso-marginal sulcus. Hip. Hippocampal gyrus. 



8a. Sagittal gyrus, xy. Secondary sulci. 



Fig. 10. 



Dorsal surface of anterior median part of brain of Otaria Gillespii, 



natural size. 



C. Crucial sulcus, ^jc. Precrucial sulcus. 



the cerebral folds, however, a small secondary, forwardly and in- 

 wardly proceeding sulcus could be detected on each side, so that 

 a minute " Ursine lozenge " might be made out when the brain 

 was viewed anteriorly. 



A vertical section of the brain shows that the calloso-marginal 

 sulcus is very widely separated from the inward prolongation of 



