NERVOUS SYSTEM. VERTEBRATA. 315 



the suprasylvian sulcus. This sulcus is seen to best 

 advantage in the Common Pig and is not complete in this 

 Diminutive Pig. 



In the Pigs also the anterior and posterior opercula of 

 the " Sylvian fissure " are so well developed that the latter 

 appears to spring from the rhinal fissure (fig. 181) as in the 

 Carnivora. It presents, however, essentially the same 

 arrangement as other Ungulates. 



The suprasylvian and ectosylvian sulci may be compared 

 to those of the Tapir (vide supra) . According to Holl, 

 however, the homologue of the ectosylvian sulcus of the 



Fig. 181. (xf.) 



SULC.SUPRAS. 



SULC.OBL. 



Carnivora is not to be sought in that which tope graphically 

 resembles it here, but in the sulci, the opercular lips of 

 which form the pseudosylvian sulcus. 



The orbital (presylvian) sulcus is placed very far forward 

 and springs from the rhinal fissure. 



As is usual among Ungulates, the rhinal fissure is 

 horizontal. 0. C. 1328 N. 



Garson, Proc. Zool. Soc. 1883, p. 416. 



For general remarks on the Pig's brain, see Garrod, 

 Trans. Zool. Soc. vol. xi. 1879, p. 13, and alsoHoll, Archiv 

 f. Anat. 1900, p. 298. 



D.409. The brain of a Corean Pig (Sus scrofa). 0. C. 1328 0. 



D.410. The brain of a Pig (Sus scrofa). 



The features distinctive of the Pig Family mentioned in 

 the description of specimen D. 408 are seen in a much more 

 pronounced and typical form here. Observe the junction 



