THE AMYGDALA IN AMPHIBIA 235 
Some of the ascending fibers of this tract end by free arboriza- 
tion in the amygdala, but many of them pass along the caudal 
border of this nucleus, giving off collaterals to its neuropil, to 
terminate by widely expanded free arborizations in the adjacent 
parts of the pyriform lobe (figs. 22, 23). This connection between 
the amygdala and the pyriform lobe I call the tractus amygdalo- 
piriformis, and I believe that it contains, in addition to the 
BLL¢y. Op, 
Ye ~~ ——~tr.c. hab. |. 
ie amg. p. 
amg. 
d.ol. p. tr. 
filet: 
d.ol.p.tr 
Fig. 23 One section ventrolaterally of figure 22. 
fibers just mentioned, axons of the small intrinsic neurons ofthe 
amygdala, and fibers passing in the reverse direction from the 
pyriform to the amygdala, though the last two types of fibers 
are not clearly demonstrated. 
The olfactory projection tracts of the Anura, the diagonal band 
of Broca, and the stria terminalis may be regarded as parts of a 
single complex system of correlation fibers which put the lat- 
eral olfactory area into physiological relationship with the ven- 
