442 J. B. JOHNSTON 
Fig. 15 Section at the base of the amygdaloid fissure. The general pallium 
still makes connection with the ventricular ridge and intervenes between the 
pyriform lobe and the nucleus of the lateral olfactory tract. This last is now 
larger and merges broadly with the caudate. The lentiform nucleus shows some 
dense collections of cells. 
Fig. 16 Section through the stria medullaris. This is about the largest and 
densest part of the small-celled area of the amygdaloid complex, consisting of the 
caudate and nucleus of the lateral olfactory tract. The great enlargement of 
this body produces the ‘epistriatum’ in lizards. The olfactory projection tract 
and part of the stria terminalis are related to this (compare fig. 49) while the 
stria medullaris enters the neuropile surrounding the rostral end of the medial 
nucleus. Note the rapid thickening of the lateral border of the dorsal pallium in 
figures 15 and 16. An angle of the general pallium connected with the ventricular 
ridge still intervenes between the pyriform lobe and the nucleus of the lateral 
olfactory tract. 
Fig. 17 Section through the extreme tip of the temporal pole or amygdaloid 
prominence and through the caudal part of the junction of thalamus and stria- 
tum. The nucleus lentiformis is larger and the nucleus of the lateral olfactory 
tract appears divided. The upper portion will in the next figure join the pyri- 
form lobe. The core-nucleus of the ventricular ridge is now well defined. Note 
the olfactory projection tract curving over the crus. 
Fig. 18 Section through the commissures just rostral to the inter-ventricular 
foramen. The crus bends laterad into the lentiform nucleus. It separates the 
caudate from the nucleus of the diagonal band which is a continuation of the 
nucleus of the lateral olfactory tract. Note the continuity of the caudate with 
the nucleus anterior region of the thalamus in figures 17 and 18. Note also the 
rapid enlargement of the primordium hippocampi in these figures as it approaches 
the level of the commissure. For the disposition of the commissures compare 
figures 32, 48 and 52. 
