246 C. JUDSON HERRICK 
The olfactory projection tracts 
In urodeles it is probable that there are fiber connections 
comparable with the stria terminalis, diagonal band of Broca, 
and ventral olfactory projection tract as described above for 
Anura; but, if present, these fibers are diffusely mingled with 
Figs. 26 to 31 A series of consecutive horizontal sections through the brain 
of a half-grown larva of Amblystoma, arranged in order from dorsal to ventral. 
Golgi method. X74. In this series the dorsal olfactory projection tract is 
impregnated for its entire length and can readily be followed. 
Fig. 26 Section through the wide interventricular foramen dorsally of the 
anterior commissure ridge. Within the ventrolateral nucleus of the cerebral 
hemisphere some of the more dorsal fibers of the lateral forebrain bundle are 
impregnated. Among these are slender wisps of the very fine fibers of the dorsal 
olfactory projection tract which are directed- medialward from the tract (cf. 
fig. 27) to reach the deeper part of the nucleus. Unimpregnated neurons of the 
stratum griseum fill the medial and caudal parts of the nucleus back to the poste- 
rior pole of the hemisphere. Medially of the latter is the eminentia thalami, 
the. axons of whose neurons form a short tract (tr.th.p.i.) ending in the pars 
ventralis thalami, as in Necturus (Herrick, 717, p. 291 and fig. 48). 
