438 C. JUDSON HERRICK 



My study of larval and adult Necturus shows clearly that Kupffer's 

 eminentia pallii medialis corresponds with a part of the undiffer- 

 entiated dorsal wall of the hemisphere and not with the eminentia 

 pa llialis medialis (Gaupp) of the frog; that his sulcus intermedius 

 is a furrow within the pars dorso-medialis and does not correspond 

 with the indentation so named by Gaupp in the frog, the latter 

 being the sulcus limitans hippocampi of my description ; and that 

 his eminentia septalis is Gaupp 's eminentia pallialis medialis 

 and my primordium hippocampi. The ependymal sulcus desig- 

 nated sulcus intermedius by KupfTer in the larva is present in the 

 adult (see Kingsbury, '95, figs. 29, 30, 31) in the same relations, 

 separating the primordium hippocampi from an undifferentiated 

 portion of the pars dorso-medialis. The sulcus limitans hip- 

 pocampi (sulcus intermedius Gaupp) is seen ventrally of this in 

 Kingsbury's fig. 31. 



ANURA 



In the half-grown frog tadpole, as in the adult, the olfactory 

 bulbs are fused at their tips, the fusion involving the glomerular 

 and mitral cell layers only. These layers extend to the extreme 

 rostral end of the bulbs and are not confined to their lateral sur- 

 faces, as in urodeles and younger frog larvae. 



As compared with the urodeles, the ventro-median part of the 

 hemisphere is greatly enlarged and a dense accumulation of cells 

 is found in its dorsal part. This is the precommissural body, or 

 nucleus medianus septi (fig. 29). The region corresponding to 

 the septum ependymale of urodeles is very massive and the lam- 

 ina terminalis is greatly thickened (fig. 30). The nucleus me- 

 dianus septi extends dorsal and caudal to the interventricular for- 

 amen, though not so extensively as in the adult (fig. 31). This is 

 the pars fimbrialis septi of Kappers ('08). 



The walls of the hemisphere are entirely massive rostrally of 

 the interventricular foramen. Caudad, however, the roof is even 

 more widely membranous than in urodele larvae. The foramen is 

 very wide and, as in the adult, there is no plexus lateralis. The 

 membranous roof of the forebrain ventricle is attached to the 



