348 



PLATE IV. (Addendum.) 

 Series of microphotographs. 



1. From a section of the marginal gyrus of Sus ; to show the prominent layer of poly- 

 morphous cells usurping the place usually occupied by small pyramidal cells. The great depth 

 of the first, or plexiform layer may also be noticed. Thionin staining. "-. 



2. The same layers, more highly magnified, x S^Ji. 



3. From a transverse section of the lower part of the sulcus lateralis (?) of Sus, stained 

 for nerve fibres. Illustrating the modified and interrupted line of Kaes curving in U form round 

 the floor of the sulcus. c -~-. 



4. One of the fasciculi illustrated in the last photograph, more highly magnified, x 3 . 



