236 



connecting the hypothalamus with the medio-ventral gray between the 

 bases of the olfactory bulbs and running along the taenia telencephali. 



Fig. 4. 



Fig. 5. 



Figs. 2 — 26. Chimaera monstrosa, transverse sections through the telencephalon 

 and diencephalon beginning near the base of the olfactory bulbs. Figs. 2 — 10 magni- 

 fied 12-5 diameters, Figs. 11—26, 25 diameters. In Figs. 3 to 21 the right half of 

 the section is drawn ; in Figs. 22 to 26 the ventral part is drawn to show the decus- 

 sation of the tractus pallii. The entire course of the tractus pallii and the tractus taeniae 

 is shown and in addition only so much of other structures as is necessary to make 

 the relations of these tracts clear. The velum transversum is situated at about the 

 level represented in Fig. 18. 



ant. decuss., the so-called rostral part of the anterior commissure ; hasal bdl., the 

 basal forebrain bundle, including tractus strio-thalamicus, olfacto-hypothalamicus, thalamo- 

 corticalis, etc.; cant., commissura anterior; com. pall, post., commissura pallii posterior ; 

 com. su})., commissura superior (OSBORN), including decussations of tractus olfacto- 

 habenularis and tractus taeniae and the commissura pallii posterior; dec. tr. pallii, de- 

 cussation of tractus pallii, being part of the complex decussatio postoptica; g. hah., 

 ganglion habenulae; tr. h. p. or tr. hub. ped., tractus habenulo-peduncularis ; tr. olf., 

 tractus olfactorius; tr. op., tractus opticus; tr. pall. r. and tr. pall, cr., tractus pallii, 

 rectus et cruciatus ; tr. taen., tractus taeniae. 



