200 ' C. Juclson Herrick 



series from cyclostomes to man. The three pallial regions which he de- 

 fines in Amphibia are: (l) área mediaHs pallii, which is the primordium 

 hippocampi of other authors; (2) área dcrsaüs pallii, a región apparently 

 comprising Soderberg's general pallium and pyriform pallium; (3) área 

 lateralis pallii, a región which occupies approximately the position of the 

 nucleus olfactorius lateralis of Soderberg. Áreas (2) and (3) comprise 

 approximately my pyriform lobe (fig. 32). 



I he first and second of these regions are termed archipallium and are 

 identified respectively with the mammalian fascia dentata and cornu 

 Ammonis. The third is the precursor of the neopallium. The pyriform 

 lobe is not recognized in Amphibia but appears in reptiles ventrally of 

 the área lateralis pallii in the posterior pole. This scheme is based 

 chiefly on topographic relations with total neglect or misapprehension of 

 the fibrous connections of the parts and a failure to grasp essential fun- 

 damental morphologic relations in lower brains. 



March 18, 1922. 



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