NERVOUS SYSTEM. VERTEBRATA. 



247 



It is a very interesting fact that an undoubted precrucial 

 sulcus is found in the deep crucial sulcus. Sometimes this 

 sulcus is exposed (fig. 119) ; in other cases it is hidden by 

 the opercular posterior lip of the crucial sulcus and is visible 

 only after raising or removing this (fig. 120) . So that in 



Fig. 119. (xf.) 



SULC.PRECRU. 



"SULC.CRU. 



Fig. 120. (x.) 



SULC.PRECRU. 



__.-$.-SULC. LAT. 



Fig. 121. (x.) 



.SULC.CALC. 



SULC.ROS. 



RH'IN.F. 



this Feline brain we find a very distinct " Ursine lozenge " 

 of Mivart. 



Another feature of great interest in the Lion's brain is 

 exposed on separating the lips of the deep " splenial " 



