409 
1910-11.] Topography of Cerebral Cortex of Guinea-pig. 
and in some parts, more especially at the posterior pole of the lobe, there 
are faint indications of the formation of a zone, but the limbic lobe is 
extremely rudimental in structure. 
B. Archipallium . — Sections taken through the pyriform lobe show a 
type of cortex absolutely distinct from any of the types described, but 
Fig. 7. — Type-V. x 100. 
corresponding to a certain extent with the typical description of archipallial 
cortex given by Bolton. 
The cortex is divisible into two zones, an upper and a lower. The 
upper zone is granular in structure, with the exception of a slight band 
of larger cells lying near the surface. The lower zone is composed almost 
wholly of polymorphic cells, among which are interspersed a fair number 
of granular cells. 
(See fig. 8.) 
