250 C. JUDSON HERRICK 
toward the projection tract. The rough and slightly thorny 
dendrites spread widely forward and lateralward among the termi- 
nals of the descending fibers of the projection tract, the medial 
forebrain bundle, and the most caudoventral component of 
the postoptic commissure, the tractus thalamo-hypothalamicus 
cruciatus. 
Br LIll-] \ 1-2- 
Fig. 29 Section through the ventral part of the decussation of the lateral 
forebrain bundles. The dorsal olfactory projection tract is turning ventrally 
and medially to leave the lateral forebrain bundle. The detached portion of the 
projection tract at the lower and is entered from the adjacent section ventrally, 
vy hich is otherwise omitted from the series of drawings. 
The intimate relationship of the tract last mentioned with 
this nucleus in Necturus I have previously commented upon 
(17, pp. 260, 269). In adults and old larvae of Amblystoma 
the same relations prevail (figs. 32, 33). The decussation of the 
thalamo-hypothalamic tract lies immediately rostrally of the 
nucleus and is penetrated by dendrites of its neurons. Terminals 
and collaterals of the tract fibers also turn caudad into the 
hypothalamus and here engage dendrites of other neurons of 
the nucleus. 
