THE AMYGDALA IN AMPHIBIA Zak 
in the amygdala. There is no evidence of physiological connec- 
tion by collateral branches or terminals with any other neurons 
between its origin in the vomeronasal formation and its termina- 
tion in the amygdala. That is, the true corpus striatum of the 
Anura does not receive any appreciable number of olfactory 
fibers, a relation in marked contrast with that of Urodela (p. 242). 
The ventrolateral olfactory tract rises up slightly dorsalward 
from its origin and then passes directly backward in the deeper 
layers of the zona limitans lateralis between the dorsal and the 
XXX/- 20! 
lob. p. 
p. hip. 
amg. 
C. S. 
Nuc. po. 
XxXX1- 209 
Fig. 4 Through the lamina terminalis immediately rostral to the interven- 
tricular foramen, showing terminals of the ventrolateral olfactory tract in the 
dorsorostral part of the amygdala. 
Fig. 5 Through the interventricular foramen on the right side and immedi- 
ately behind it on the left, the section being slightly oblique. At this level the 
amygdala attains its maximum size and its neurons are very-numerous; those 
of the corpus striatum are few in number. 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 33, NO. 3 
