228 



PHYSIOLOGICAL 



Sylvian fissure" have vanished (fig. 102), but the more 

 stable suprasylvian sulcus remains in this specimen (figs. 

 101 & 102) to add further confirmation to the interpretation 

 of the Sylvian complex of Myrmecophaga (D. 281). [Some- 

 times, however, even the suprasylvian sulcus disappears in 

 Tamanduas (fig. 103) ; this is especially helpful in inter- 

 preting the Rodent brain, for it shows that an undoubted 



Fig. 101. (Nat. size.) 



SULC.PROR.... 

 SULC.ORB 



SULC.SUPRAS- 



SULC. LAT. 



Fig. 102. (Xat. size.) 



5ULC. SURRAS. SULC.LAT. 



lateral (or corono-lah-ral) sulcus may exist without the 

 suj.rasylvian, \vhieh is usually the more precocious and 



The lateral Mih-ns i^ very shallow. In this >peeimcil it 

 is unsymmetrical and consists of two irregular fragment s 

 on each side. 



The cerebellum (compare fig. 103) is a simplified ami 

 smaller ropy of that of the (ireat Anteater. The tloccular 



