126 Drs. Mott, Schuster, and Halliburton. [Oct. 20, 



faintly indicated on the surface of the brain, and only the Sylvian, the- 

 hippocampal, and the calcarine fissures show any considerable depth in; 

 section. It will also be observed that there is a definite occipital lobe which 

 covers the cerebellum. 



a, 



Pig. 1. — Eight heinispherc of MariDo.set'.s brain, seen («) from the outer ami (/>) fioiir 

 the nieHial surface, x 2. The extent of the diflerent types of cortex deHcribed is- 

 shown diagrannnatically (see key). The lines AA, IJB, etc., show the planes of 

 the sections represented in fig. 2. The Eoraan figures refer to the paraffin 

 blocks made, and have no significance except to the authors. 



Nr.opallium. Motor Arm A {fin. 3).* Extent and lionndaries.— The motor 

 type of cortex is found, as mif,dit be expected, on tlie front half of tlie brain, 

 and above] the Sylvian fissure (see fig. 1). The greater part lies on tlie 

 external surface, but it also spreads over on to the mesial. On the mesial 

 * For figs. 3 to G see accompanying plates (Mates 0 and 7). 



