310 PHYSIOLOGICAL SERIES. 



In the brain of the Tapir the u Sylvian fissure " is 

 represented by a short deep snlcus (fig. 179) ascend in g 

 vertically from the oephalio prolongation of the posterior 

 rliinal fissure for less than halt' an inch. The posterior lip 

 of this " fissure" is a large operculum covering a dej 

 area which is continuous with a narrow, uncovered, de- 

 pressed area above the posterior part of the orbital suleus. 

 The latter area is limited above by an operculum, the hori- 

 zontal limiting suleus of which (fig. 179, A) appears to 

 join the " Sylvian fissure." There is no feline pseudo- 

 sylvian suleus. 



There is an inverted-U-shaped suprasylvian arc (conjoint 

 supra- and postsylvian sulci), which appears to join tilt- 

 above-mentioned horizontal limb (A) of the Sylvian com- 

 plex. In reality a submerged gyrus separates the two 

 sulci. 



The posterior part of the suprasylvian arc is formed of a 

 vortical limb (postsylvian suleus), as in most Carnivores. 

 It will be seen, however, to give off a short horizontal 

 posterior ramus, which is a very characteristic Ungulate 

 feature. 



The Ungulate lateral suleus is generally oblique (as it is 

 in this case), so that its anterior extremity is nearer the 

 mesial plane than the posterior, and it is not joined to 

 the coronal suleus. There is an entolateral suleus of com- 

 plicated shape (fig. 180). The coronal suleus is also placed 

 very obliquely, as it is in many early Tertiary Ungulates, 

 such as Titanotherium. 



The orbital suleus is like that of the Carnivora. There 

 are also compensatory orbital sulci (fig. 179). Most of the 

 sulci of the hemisphere have numerous offshoots, >> that 

 the appearance of its surface is very complicated. 



In the left hemisphere (fig. 178) the conjoint caleaiine 

 and intercalary (splenial) sulci are united with the genual 

 to form a complete cingular arc. On the right side the 

 genual does not join the intercalary suleus. Midway 

 between the cingular complex there is a series of shallow 

 sulci which may be called the " subcingular sulci." 



In spite of its large size, the cerebellum exhibits exceed- 

 ingly simple features. The floccular lobe is very 



