NATURAL SUBDIVISION OF THE CEREBRAL HEMISPHERE. 437 



in contact with (or fused to) the surface of the corpus striatum ; 

 nor, for similar reasons, should the " island of Eeil " be separated 

 from the rest of the neopallium. 



In spite of these obvious defects, Eeichert's terminology 

 became almost universally adopted ; and the name " pallium " 

 was, without any more precise definition, very generally applied 

 to the thinner portions of the walls of the cerebral hemispheres 

 in all Vertebrates. Even at the present day the term "mantle " 

 may be used to designate the epithelial roof of the hemisphere 



ttjt. 



ippocampus 

 udus. 



Fascia 

 dentata. 



~ "" Fornix. 



— ♦Lamina terminalis. 



— —Optic chiasma. 



Fig. 4. — Diagram representing a part of figure 3 on an enlarged scale. 



of a Teleostean, or the thinner parts of the hemisphere in 

 Keptiles, without any attempt to determine whether or not 

 this thin portion is in any way comparable to a cortical forma- 

 tion, or, granting that it is so, that it may not be partly repre- 

 sented in the mammalian brain by those cortical areas which 

 are placed in contact with the corpus striatum, and as such 

 belong, not to Eeichert's " pallium," but to the " Stammlappen." 

 It is true, however, that some writers have slightly modified 

 Eeichert's conception by expressing the main idea of his teach- 

 ing in the more accurate language of modern Anatomy in such 

 a way as to avoid the obvious inconsistencies indicated in the 



