504 Dr. F. W. Mott and Miss A. M. Kelley. | Mar. 6, 
pyramidal cells of the neopallium. There is no definite granule layer, but a 
number of faintly staining granules are scattered below, and in the lower 
part of the pyramidal layer. Infra-granular pyramids, measuring about 30 w 
by 15 yw, take the stain well, and form a fairly conspicuous line. 
This area seems to be intermediate in type to the neopallium and the 
archipallium. On comparing fig. 11 (type “R”) with fig. 12 (olfactory type) 
and fig. 9 (neopallium, temporal type), it will be seen that the cortex is 
deeper in type “ R” than in the olfactory area, but more shallow than in the 
neopallium ; and that in the deep molecular layer, and also in the form of the 
superticial layer of the pyramids, it resembles the olfactory type; but in other 
respects it follows the neopallial type. 
Limbic Area 
Extent and Boundaries.—The limbic type forms a band around the whole 
extent of the corpus callosum, and extends along the narrow gyrus between 
the calcarine and hippocampal fissures, which forms a link between the 
upper and lower portions of the limbic lobe. (This posterior part of the area 
is only visible on the surface by the removal of the basal ganglia by which 
the upper portion of the hippocampal fissure is exposed.) The intercalary 
sulcus forms the superior boundary of this area, and an imaginary line 
continues it to the anterior limb of the calcarine fissures. Anteriorly it 
spreads into a band, about 5 mm. wide, around the anterior genu of the 
corpus callosum. The anterior limb of the calearine fissure, and, as the area 
extends downwards in a narrow strip, the calcarine stem form its posterior 
boundaries, and inferiorly it is folded within the hippocampal fissure, as is 
shown on fig. 4. 
Characteristics (fig. 13).—The cortex measures about 1°3 mm. in depth. It 
seems to be of low development, and cannot be readily divided into layers. 
The molecular layer is deep, measuring about 0°23 mm. The layer corre- 
sponding in position to the pyramidal layer of the neopallium is formed of 
blunt triangular or rounded cells, which take the stain poorly, and have no 
tendency to regular arrangement in columns. These cells form a layer about 
08 mm. deep. Below it there is a layer of faintly-stained polymorph cells. 
Between the two layers is a scattered line of sharply-stained stellate cells 
measuring about 15 p by 7. A number of granules are scattered throughout 
the cortex, especially in the lower part of the pyramidal layer. 
