NERVOUS SYSTEM. VERTEBRATA. 



the coronal. The lateral sulcus is broken up into tri- 

 radiate fragments anteriorly. 0. C. 1327 B. 



Holl, Arch. f. Anat. 1900, p. 313. 



D. 484. A cast of the cranial cavity of a Goat (Capra hircus). 



D. 485. The brain of a Goat (Capra), dissected to show the hip- 

 pocampus in the left cerebral hemisphere. 0. C. 1327 B a. 



D. 486. The brain of a Sheep (Ovis aries) (figs. 194, 195, 196). 



This brain clearly exhibits the typically Ungulate ar- 

 rangement of the pseudosylvian, orbital, and suprasylvian 

 sulci, as described in the Goat. The coronal, however, is 

 not joined to the suprasylvian sulcus in this specimen. 



The three accompanying diagrams explain the general 

 disposition of the cerebral sulci. The small insignificant 

 notch (S) above the rhinal fissure probably represents the 



Fig. 194. (x|.) 



SULC. LAT. 



SS.P. 



OLF BULB/ ^_ 



SULC. ORB. E RHIN.F 



pseudosylvian fissure of the Carnivora, whereas the much 

 longer (S') furrow, generally called " Sylvian fissure," is 

 formed by the meeting of the opercular upper lips of the 

 anterior (fig. 194, E) and posterior (F) ectosylvian sulci. 

 It will be seen from the account of the brain in the 

 Lemuroidea that neither the Carnivore nor the Ungulate 

 type of pseudosylvian fissure represents the true (Primate) 

 Sylvian fissure, which is a complex of several elements. 

 The chief of these, and therefore the nearest homologue of 



