354 Journal of Comparative Neurology and PsycJwlogy. 



as being the most reliable marks for the determination of simi- 

 lar levels. 



At birth the cerebral hemispheres show many vvell-medul- 

 lated tracts. The section reproduced in figure 14, plate VI, 

 is through the cornu Ammonis. ventral to which lie the thala- 

 mic structures. An outline drawing has been introduced (Text- 



T ex t- figure 12. 



fig. 12) as a key to the representations of the sections of the 

 cerebral hemisphere. The letters in parenthesis refer to corre- 

 sponding figures in the diagram. 



In the diencephalon the thalamus opticus (77/. o) with 

 fibers (Radiatio lateralis thalami, R) radiating into the internal 

 capsule (Capsula interna, Ci)\ the fasciculus of Vicq d'Azyr 

 (fasciculus thalamo-mammillaris, Fm\, the Columna fornicis {Cf)\ 



[62] 



