104 



BRAINS OF RATS AND MEN 



23). The parts so far listed comprise the old striatum of reptiles. 

 To these there is added a new structure which Johnston at first 



rKmal fissure 



endorhina^ fissure 



nerve 



iSSUfC 



Fig. 20. — Lateral aspect of the cerebral hemisphere of the box- 

 tortoise, Cistudo. The amygdala (amg.) is partly covered by pyriform 

 cortex. Figs. 20-24 are based on drawings by Johnston (191 5). 



dorsal vehtncular ridge 



lateral ventricle 

 o\focio-stnatum 



amygdaloid 

 r'idgc 



Fig. 21. — The lateral wall of the cerebral hemisphere of the box- 

 tortoise dissected off and viewed from the ventricular surface, to illus- 

 trate the dorsal ventricular ridge and its subdivisions. 



(1915) called the "dorsal ventricular ridge" (Fig. 21) and Elliot 

 Smith (19 1 9, 1919^) called "hypopallium," to be described more 

 in detail presently. 



