CEREBRAL CONVOLUTIONS OF THE CARNIVORA. 5^ 



which morphologically is behind the fissure to be actually in front 

 of its distal portion. Behind this apparently recurved end of 

 the fissure, there is a vertical groove on the middle of the Sylvian 

 gyrus, which is thus altogether extremely broad posteriorly. 

 The sagittal gyrus is longitudinally grooved at its hinder part, 

 and there is a relatively large crucial sulcus, into which, no 

 doubt, the callo so-marginal sulcus is duly continued. 



Hycena andCrocuta. — The brain o£ the Hysenas* shows a rather 

 prolonged Sylvian fissure, while the posterior limb of the Sylvian 

 gyrus is twice the breadth of its anterior limb, and is vertically 

 grooved, and may be doubly grooved, so that the Sylvian fissure 

 may seem to be posteriorly recurved. There is a very large crucial 

 sulcus, into which the calloso-marginal sulcus is prolonged on the 

 inner face of each hemisphere. The parietal shows no tendency 

 to the canine bifurcation. 



Proteles. — The brain of this singular animal f presents all the 

 essential characters of that of the Hyaenas. 



Cryptoprocta. — I am indebted to the kindness of Professor 

 Alphonse Milne-Edwards for a sketch of the brain of this 

 animal, which is only otherwise known by a cast of the interior 

 of its skull +. The crucial sulcus is distinct, though rather 

 small, and anteriorly situated. The parietal and sagittal gyri 

 communicate towards the hinder end of the cerebrum. The 

 Sylvian gyrus appears to resemble rather that of the Hysenas, 

 its posterior limb being double the width of its anterior limb, 

 and obliquely grooved from above downwards. This groove, 

 however, seems, by the drawing, to join above the upper part of 

 the Sylvian fissure, which has thus an appearance of being re- 

 curved, as it has in the Suricate. It may be, however, that the 

 Sylvian gyrus is very short and embraced by two distinct Sylvian 

 gyri, as it is in the Dogs. If this is not the case, then the Sylvian 

 gyrus is like that of Serpestes, Crossaj-chtis, Suricata, and the 

 Hysenas; while the connection between the parietal and sagittal 

 gyri is a character which reminds us of the Telidse. There is 

 certainly no special resemblance to the Viverrince. 



The non-canine and non-feline forms hitherto reviewed appear 

 to present the following affinities : — In the first place their brain 

 differs from that of the Cats by the non-continuance of the 



* See Leuret, /. c. p. 378 ; and P. Geryais, /. c. p. 119, pi. ix. fig. 11 (brain 

 of G'ocicta) ; see also Krueg, I. c. pi. xxxvi., and Burt Wilder, I. c. fig. 9. 



t See Flower, P. Z. S. 1869, pp. 478-482, figs. 1-4 ; and Krueg, I. c. pi. xxxvi. 

 I See P. Gervais, I. o. p. 123, pi. vi. fig. 2. 



