190 PHYSIOLOGICAL SERIES. 



Hedgehog and the Bandicoot is, however, very close, as a 

 glance at figs. 52 and 65 so clearly demonstrates. 



In the Hedgehog the olfactory apparatus is extra- 

 ordinarily largely developed, as we might expect in such a 

 lowly mammal of fossorial habits. 



The neopallinm is reduced to exceedingly diminutive 

 proportions, so that the rhinal fissure (fig. 63) is placed 

 very high up upon the lateral wall of the hemisphere. 

 Thus the pyriform lobe forms the greater part of the lateral 

 wall. 



Fig. 65. (xli) 



.OLF.BULB. 



Tliere i- a >liort. very shallow, tran-vrr-r orbital (pre- 

 -\lvian) furrow on the dorsal surface, as in Perawr/cti and 

 Sarcophilus. In the nearly-related and larger Gymnura this 

 -hallow furrow becomes converted into a deep sulcus. 



The fascia dentata makes its appearance upon the 





