Plate XV. bi, brachium of posterior colHculus; bs, brachium of anterior 

 colliculus; cf, column of the fornix; ds, supramamillary decussation; 

 fd, fascia dentata; fh, hippocampal fissure; fhe, external hippocampal 

 fibres; fhs, fasciculus hippocampo-subsplenialis; flm, medial longi- 

 tudinal bundle; fm, fasciculus retroflexus; frh, rhinal fissure; gm, 

 medial geniculate body; i, posterior extension of cavity of infundi- 

 bulum; Im, medial lemniscus; ml, lateral nucleus of mamillary body; 

 mm, medial nucleus of mamillary body; nc, neocortex; nda, nucleus 

 of Darkschewitsch; nic, interstitial nucleus of Cajal; npt, nucleus 

 of transverse peduncular tract; pm, peduncle of mamillary body; 

 pp, basis pedunculi; pyc, pyriform cortex; sg, stratum griseum of 

 anterior colliculus; si, stratum lemnisci of anterior colliculus; sn, 

 substantia nigra; soa, optic layer of stratum opticum; sob, non-optic 

 layer of stratum opticum; sp, stratum profundum; sz, stratum 

 zonale; ta, tapetum; tg, mamillo-tegmental tract; tpt, transverse 

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

 w, layer of white matter superficial to tapetum. 



