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Show 434 MR. F. E. BEDDARD ON 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 Paradoxurus; fainter traces in Genetta and Viverricula; none at all in Herpestes and Gynictis. W h e n 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 Gynictis. In Paradoxurus, Genetta, and Viverricula 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 hinted 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 gyri, and one of the two small fissures marked b in the drawing (woodcut, fig. 5) will be the Sylvian fissure. Brain of Cryptoprocta ferox. Fig. 4.-Dorsal view. Sa, sagittal gyrus; Pa, parietal gyrus ; Sy, Sylvian gyrus. Fig. 5.-Lateral view. s, Sylvian fissure; b, post-Sylvian fissure. It will be noticed that the anterior of the two fissures arises the summit of the angle formed by the pallial fissure, which is in favour of its identification with the Sylvian fissure. O n the right |
