THE MODIFICATION OF THE BKAIN. 



63 



Pl3. 22. — Inner views of the cerrbral hemispheres of the Eabbit, Pig', and Chimpanzee, 

 drawn as before, and placed in the same order. 01., olfactory lobe ; C.c, corpus callo- 

 sum; A.c. anterior commissure; R., hippocampal sulcus; C^n., uncinate ; M.. mar- 

 ginal ; (\. callosal gyri ; I.p., internal perpenuicular ; Ca., calcarine ; Coll., collateral 

 sulci; F , fornix. 



inclined upward and backward ; and its anterior extremity is 

 but slightly bent downward, so that the so-called ge7iu and 

 rostrum are inconspicuous. The Pig's corpus callosum ia 



