NERVOUS SYSTEM. VERTEBRATA. 299 



There is a small orbital (presylvian) sulcns, which does 

 not join the rhinal fissure on the right side, but does so on 

 the left hemisphere. 



On the right hemisphere there is a very slight notch in 

 the upper lip of the rhinal fissure, such as represents the 

 "Sylvian fissure" in many Viverrida?. This is even more 

 faint on the left hemisphere and is of doubtful significance. 

 There is a short sagittal coronal and a similar lateral sulcus 

 both such as occur in the smaller Cervidae and Tragu- 

 lidse. There is a small rostral sulcus. 



The small cerebellum is rounded and compact, and its 

 folia present the simple transverse arrangement found in 

 the Capybara and other Rodents and most Ungulates. 



0. C. 1330 G. 



Krueg, Zeitsch. f. wiss. Zool., Bd. xxxiii. 1880, p. 648. 



Turner, Journ. Anat. and Phys., vol. xxv. 1890, p. 122. 



D. 388. The two cerebral hemispheres of a Hyrax (Procavia sp.) 

 (fig. 171). 



In these hemispheres there is a long and fairly definite 

 sulcus (fig. 171, s), such as would by most writers be 



Fig. 171. (Nat. size.) 



SULC.SU PR A3. 



SULC.COR. 



SULC.P.SYL 



unhesitatingly branded " Sylvian " in a Carnivore. This 

 sulcus was found in only one of seven brains examined, 

 although in a second specimen such a groove was produced 

 by the middle cerebral artery. On the other hand, the 

 presence of a more definite vertical postsylvian sulcus 

 parallel to this psendosylvian sulcus shows that the latter is 

 sufficiently definite to influence the adjoining cortical areas. 



