434 



MH. F. E. BEDDAED OX THE 



[May 21, 



anterior part of the sagittal gyrus lying behind the crucial sulcus 

 by a deep but short fissure into two parts. There are fair traces 

 of this in Paradoxunis ; fainter traces in Genetta and Viverncula ; 

 none at all in Heiyestes and Cynictis. 



When the olfactory bulbs are gently pulled down from the 

 anterior edge of the brain, they are seen to have covered a vertical 

 furrow on each side, which are present in Herpestes and Cynictis. 

 In Paradoxurns, Genetta, and Viverncula this fold is more laterally 

 placed, so that it is not concealed by the olfactory bulbs. It will 

 be seen from the brain of Cryptoprocta that there are indications of 

 this furrow, which seems to show that it is not the homologue of the 

 anterior one of Herpestes. Dr. Mivart has hiuted that the Sylvian 

 fissure may possibly not be that which I have identified with it in 

 the present paper. In this case the brain will come to resemble 

 that of the dog in having four gj'ri, and one of the two small fissures 

 marked h in the drawing (woodcut, fig. 5) will be the Sylvian 

 fissure. 



Brain of Crypfoprncta ferox. 



Fig. 4. — Dorsal view. 

 Sa, sagittal gyrus ; Pa, parietal gyrus ; Sy, Sylvian gyrus. 



Fig. 5. — Lateral view, 

 s, Sylvian fissure ; h, post-Sylvian fissure. 



It will be noticed that the anterior of the two fissures arises from 

 the summit of the angle formed by the pallial fissure, which is in 

 favour of its identification with the Syh-ian fissure. On the right 



