CEREBRAL CONVOLUTIOlSrS OF THE CAENIVORA. 5 



FeUd(B. 

 A similar but different uniformity prevails amongst the exten- 

 sive group of Cats *, whether of the largest or smallest species 

 though, as has been again and again remarked, the larger the 

 species the more convoluted the gyri ; especially is this the case 

 with the fourth or uppermost gyrus. Small bridging convolu- 

 tions have been observed f connecting the sagittal and parietal 

 gyri. They, however, are very inconstant ; but there is a constant, 

 more or less extensive connection between the parts answering to 

 the two Sylvian gyri of the Dog. Thus in every Cat there is a 

 very broad gyrus next the Sylvian fissure, either limb of w^hich is 

 grooved by a more or less vertical sulcus, which is the rudimen- 

 tary representative of the sulcus which completely separates the 

 two lowest circum-Sylvian gyri of the Dog. The second distin- 

 guishing character common to the whole of the Felidse, so far as 

 I have been able to observe, is the non-bifurcation (or subdivision 

 by a longitudinal groove) of the parietal gyrus. The third uni- 

 versal character is the continuation of the hippocampal gyrus 

 forwards and upwards to blend, behind the crucial sulcus, with 

 the sagittal gyrus, the hinder end of the crucial sulcus being thus 

 separated off from the anterior end of the calloso-marginal sulcus 

 by the ascending bridge of convolution from the hippocampal 

 gyrus. Sometimes the, always very conspicuous, crucial sulcus 

 is placed very far forwards %. It is always simple, as in the 

 Dogs. 



The genera which compose the other families of Carnivora differ 

 so in the details of their cerebral structure as to demand separate 

 notice. 



Viverra. — The Civet § has the parts which answer to the two 

 lowest circum-Sylvian gyri of the Dog still more completely 

 blended together than they are in the Cats. The single Sylvian 



* See Leuret, I. c. vol. i. p. 378, plate v. ; Dareste, I. c. p. 74, figs. 3 & 4 ; and 

 P. Gervais, I. c. p. 119, and plate ix. fig. 7. See 'The Cat' (published by- 

 John Murray), pp. 268 & 269, flgs. 125, 126, 127. " The Brain of the Cat," by 

 Professor Burt Wilder, a paper read before the American Phil. Soc, July 15th, 



1881, four plates ; also Krueg, I. c. pp. 547-622, and plate xxxv. 

 t By MM. Leuret and Gratiolet. 



\ As in the Cheetah. See P. Gervais, I. c. plate is. fig. 7, and Owen, Trans. 

 Zool. Soc. vol. i. plate xx. 



§ See Leuret, I. c. p. 378 ; P. Gervais, p. 128, pi. ix, fig. 5. See also P. .Z. S. 



1882, p. 516 ; Krueg, I. c. p. 625, plate xxxvi. 



