THE FOREBRAIN OF THE ALLIGATOR ISH: 
are primitive and, in themselves, insufficient for the formation 
of cortex. 
Again, all the correlated material brought to each of these corti- 
cal areas contains olfactory and non-olfactory elements, the lat- 
ter including visceral and somatic types. ‘The differences in 
significance of the areas are due to a preponderance of a given 
type of correlation in each case. In the hippocampus the olfac- 
to-visceral elements are very large and dominate the situation; 
in the pyriform lobe there is a considerable amount of corre!a- 
tion of the olfacto-visceral type, but there is a sufficient propor- 
tion of somatic impulses to give this lateral cortex a different 
physiological importance from that of the hippocampus. The 
olfacto-visceral types of correlation are small in the general cor- 
tex and the somatic types predominate. 
The great significance of this general cortex in the alligator is 
the appearance of a somatic center having a high cortical type 
of integration. Nevertheless, since the general cortex is under 
tolerably direct olfactory influence from the adjacent hippo- 
campal and pyriform cortex (and possibly from other sources), 
it cannot be regarded as fully differentiated neopallium, though 
it is undoubtedly the immediate precursor of that type of cortex. 
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