12 MR. ST. GEORGE AlITABT ON THE 



They are, however, very minute, and more or less hidden under 

 the fold of cerebrum which overhangs the crucial sulcus pos- 

 teriorly. I have also ascertained that the calloso-marginal sulcus 

 does not attain the crucial sulcus, so that the hippocampal and 

 sagittal gyri join below the former sulcus. 



Ailurus. — The brain of the Panda * is well represented in the 

 Museum of the B-oyal College of Surgeons. The anterior limb of 

 the Sylvian gyrus is but little wider than its posterior limb. The 

 latter is marked by a secondary sulcus, which descends from the 

 hinder margin of the elongated Sylvian fissure, producing the 

 appearance of a recurvation of that fissure — an appearance 

 already noted in the brain of Swricata and Ily(B7ia. In other 

 respects the cerebrum much resembles that of Procyon, save that 

 there is a feebler indication of the lozenge-shaped patch of brain- 

 substance in front of the large crucial sulcus. Behind that 

 sulcus, the hippocampal gyrus joins with the sagittal one, as in 

 Frocyon and Nasua. 



Ailuropus. — I have not seen the brain of this very interesting 

 form, but only a mould of the interior of the skull t. The brain 

 is evidently short and broad, with a very large crucial sulcus, which 

 gives off in either hemisphere a secondary sulcus proceeding 

 inwards and forwards, and so defining a large and conspicuous 

 lozeuge-shaped tract of brain-substance, which is larger (re- 

 latively as well as actually) in this somewhat bear-like animal 

 than in the preceding Arctoid species. I shall henceforth speak 

 of this cerebral patch as the " Ursine lozenge^ The Sylvian 

 fissure is very long and placed very obliquely. The Sylvian 

 gyrus has its anterior limb much the narrower. The anterior 

 limb of the sagittal gyrus is very large and very much convoluted. 

 Bassaris. — The cranial characters of this much-disputed genus 

 have already abundantly proved that it is no Yiverrine animal, 

 but belongs to the great Arctoid group. (Prof. P. Gervais's 

 figure of a cast % of the interior .of the skull is the least satis- 

 factory and instructive of his whole series.) Nevertheless, the 

 existence of a large crucial sulcus would alone be a strong align- 

 ment against its having an affinity to the Civets. It seems 



* This is noticed by P. Gervais, I. c. p. 141, and he figures (pi. viii. fig. 8) 

 a mould of the inside of the skull. The brain itself is described and figured by 

 Professor Flower, Proc. Zool. Soc. 1870, pp. 755-757, figs. 1, 2, & 3. 



t See P. Gervais, I. c. p. 136, pi. viii. fig. 9. 



\ See I. c. pi. vii. fig. 6 ; for a notice see p. 140. 



