140 



MR. r. E. BEDDAED Olf THE BRAIN OF GULO. [Feb. 19, 



however, absolutely ignorant of the characters of the convolutions 

 of the cerebral hemispheres ; for a cast of the inside of the skull 

 has been described and figured by Gervais \ whose paper is duly 

 quoted by Mivart. It is, however, much more satisfactory to base 

 a description upon the actual brain, which I now propose to do. 

 I have compared the brain with actual specimens of the brains of 

 Nasua rufa, Meles taanis, Ictonyx zorilla, Galictis harhara, and 

 Miistela foina, which are among the Prosector's stores, besides, of 

 course, with the descriptions and figures of Mivart and others. 



Fig. 1. 



Brain of Giilo (dorsal view). 

 c, crucial sulcus. 



The outline of the brain of Gulo is, as will be seen from the 

 accompanying drawing (fig. 1), remarkable. It is almost that of 

 a square surmounted by a triangle, the line of division being the 

 crucial sulcus. The cerebellum is largely hidden by the cerebral 

 hemispheres, as is the case with some other Arctoidea, notably 

 Ictonyx. Mustela stands at the opposite extremity, the cerebellum 

 being in that animal but slightly overlapped. 



The Sylvian fissure is long. As is generally tho case with the 



* " M^moire sur les formes c^r^brales propres aux Carnivores " Nouv Arch 

 Mu8. Ti. p. 103. 



