NERVOUS SYSTEM. VERTEBRATA. 



201 



and in virtue of the great extent of the mantle of the 

 cerebral hemispheres there are numerous sulci. The 

 aberrant character of the Rodent brain is therefore more 



Fig. 71. (x.) 



OLF.BULB. 



SULC.COR. 



SULC. SUPRAS. 



.SULC.LAT. 



strikingly exhibited than it is in the smaller and less-richly 

 furrowed brains of the Order. 



When viewed from above or below the cerebral hemi- 

 spheres present a peculiar lozenge-shape, the lateral edge 



Fig. 72. (x.) 



SULC.CALC. 



SULC. SEN. 



\ 



SULC.ROS... 



HIP. F 



of each hemisphere being so shaped as to form a projecting 

 angle slightly behind its mid-point. The large olfactory 

 bulbs project freely in front of the hemispheres. 



