BoA: Cc. JUDSON HERRICK 
a short distance and then diverge from it medialward and ventral- 
ward to connect with its nucleus in the chiasma ridge. Its 
fibers are probably derived in part from the large neurons of the 
amygdala (fig. 13) and in part from the nucleus at its lower end. 
Free terminal arborizations are found in both of its terminal 
nuclei. 
tect. 
tr. amg. p. 
pe eee en ce gE =e 
z. lim. lat. sige eZ ZZ SS th op. 
tr. hab. |. 
amg. 
crabs oi Z LE 
SOO aN a S, 
nue, po. ~ Hf : 
hr po. by 
P Y, aS Xxu- 64 
ch. 
Figs. 22 and 23 Two adjacent longitudinal sections through the brain of 
Rana pipiens by the Golgimethod. > 20. The plane of section is inclined about 
45° to the horizontal, as indicated by the diagram, figure 23 A, and the caudal 
ends of the sections figured are, on the right side, slightly nearer the median 
plane than the rostral ends. The sections are taken from the right side, including 
a portion of the left side below. 
The plane of these sections is so chosen as to show the entire extent of the dor- 
sal olfactory projection tract and its nucleus, a horseshoe-shaped neuropil lying 
on both sides of the meson in the dorsal part of the chiasma ridge. The arbori- 
zations of this tract in the dorsolateral quadrant (pyriform lobe) of the cerebral 
hemisphere are shown. There are also included a portion of the lateral fore- 
brain bundle, the neuropil of the corpus striatum from which its decussating 
fibers arise, the forward extension of this bundle into the ventrolateral quadrant 
(corpus striatum), and a portion of the medial forebrain bundle extending for- 
ward into the ventromedial quadrant (septum). 
