NERVOUS SYSTEM. VEKTEBRATA. 



259 



just as it frequently does even in members of the same 

 genus and species. 



There is a deep, simple, posterior ectosylvian sulcus, 

 which is quite separate from the anterior sulcus, as in the 

 Cats (fig. 130). 



There is a great suprasylvian arc formed usually of 

 conjoint diagonal, suprasylvian and postsylvian sulci, but 



Fig-. 133. (x.) 



SULC. ORB. 



SULC CRU. 



"SULC. COR. 

 SULC.LAT. 

 SULC.SUPRAS 



SULC.ECTOS.P. 

 ''SULC.RSYL. 



Ffr.184. (X.) 



SULC. INTER. 



SULC. CALC. 



sometimes the diagonal sulcus may be separate (figs. 130 

 & 133), as in the right side of specimen D. 317. 



There are large typical coronal, lateral, and postlateral 

 sulci and a very long deep orbital (presylvian) sulcus, with 

 occasionally a small accessory orbital springing from the 

 rhinal fissure still further forward. 



