226 RALPH EDWARD SHELDON 
commissurale (figs. 39, 139, fib. precom. str.). So far as the fiber 
connections are concerned, therefore, a definitely limited corpus 
striatum in the basal lobes can not be found, thus agreeing with 
the relations as shown by a cytological study. . 
In the pedunucli thalami, as was noted earlier, the fibers of the 
lateral forebrain bundle enclose the nucleus entopeduncularis, 
giving off collaterals to it (figs. 68, 69, 72, 139). 
Throughout the extent of the pedunculi thalami little change 
takes place in the bundle; as it passes over the chiasma its com- 
ponents extend slightly ventrad, however, and now cover all of 
the lateral surface of the peduncles (figs. 73, 76). At the rostral 
margin of the lateral lobes the more ventral bundles become 
closely massed against the commissura transversa (figs. 77, 79), 
caudal to which they bifurcate, a few fibers entering the nucleus 
anterior tuberis (fig. 80), while many turn into the nucleus pre- 
rotundus (figs. 80, 82, 83, 100). The larger proportion of these 
two sets of fibers are ascending as Catois states (figs. 104, 105), 
although a part are certainly descending. Farther caudally the 
intermediate fibers of the bundle likewise turn ventro-laterad and 
enter the caudal part of the nucleus prerotundus, passing through 
it to distribute along the rostro-mesal aspect of the nucleus rotun- 
dus and to the ventral part of the nucleus diffusus lobi lateralis 
(fig. 83). Part of the nucleus prerotundus fibers are ascending, 
but a definite statement can not be made regarding those of the 
nucleus rotundus. In the latter case there is no doubt but that 
most of them are descending as C. L. Herrick, Catois and others 
describe, although the intermediate bundles certainly contain 
some ascending fibers. The fibers break up in the nucleus pre- 
rotundus and rotundus in a very characteristic manner, noted by 
the earlier workers on the teleostean diencephalon (see C. L. 
Herrick (92), nidulus ruber). This was mentioned earlier and is 
shown in fig. 102. The dorsal bundles distribute caudally a few 
fibers to the nucleus subrotundus, nucleus posterior thalami, 
nucleus cerebellaris hypothalami and a large number to the nu- 
cleus diffusus lobi lateralis, ventrally and caudally. The tractus 
olfacto-hypothalamicus lateralis has practically the same dis- 
tribution excepting that it sends no fibers to the nucleus subro- 
