CORTEX AND CORPUS STRIATUM i 



°S 



Figure 20 shows a lateral view of the cerebral hemisphere of 

 the box-tortoise. The corpus striatum (putamen) is superficial 

 laterally (in mammals this is covered by cortex). Part of the 

 amygdala is superficial, though most of it is covered by the pyri- 

 form cortex, which is bounded above and below by the rhinal 

 and endorhinal fissures. If the lateral wall of the hemisphere is 



^enerol cortex 



h'ppocQmpol 

 cortex 



Illal thickening 



puriform 

 ' cortex 



hqpopQilIum 



sept 



qUpq I fore brain 

 bundle 



medial tofebro'in bundle 



Fig. 22. — Cross-section through the anterior part of the cerebral 

 hemisphere of the box-tortoise. 



dissected off and examined from the ventricular surface, the ap- 

 pearance is as shown in Figure 21. Figures 22-24 show cross- 

 sections through the anterior, middle, and posterior parts of the 

 hemisphere, respectively (cf. Fig. 10, p. 76). 



Internally of the putamen is the globus pallidus (Figs. 20, 

 23) and internally of both of these is the olfacto-striatum (Figs. 

 21, 22, 23). These comprise the old striatum, directly derived 

 from the striatum of Ichthyopsida. Above these is the "dorsal 

 ventricular ridge," a new structure which is not represented at 

 all in fishes and amphibians. The whole of this was called 

 "hypopallium" by Elliot Smith because its relations are more 



