Plate XVII. as, aqueduct of Sylvius; cf, column of fornix; cha, habenu- 

 lar commissure; cpt, posterior commissure; cs, subthalamic nucleus; 

 fd, fascia dentata; fe, endorhinal groove; fh, hippocampal fissure; 

 fhe, external hippocampal fibres; fhs, fasciculus hippocampo-sub- 

 splenialis; fm, fasciculus retroflexus; frh, rhinal fissure; gl, lateral 

 geniculate body; gm, medial geniculate body; h, hippocampus; i, 

 infundibulum; Im, medial lemniscus; nc, neocortex; npr, posterior 

 nucleus of thalamus; pp, basis pedunculi; pyc, pyriform cortex; 

 tc, tuber cinereum; toh, olfacto-hypothalamic tract; tro, optic 

 tract; vd'a, mamillo-thalamic tract; vl, lateral ventricle; vt, third 

 ventricle; zi, zona incerta. 



