516 PROF. ST.-GEORGE MIVART ON THE JELUROIDEA, [June 6, 



backwards, which may be considered as representing the crucial 

 sulcus and the calloso-marginal sulcus united. 



Fig. 11. 



Brain of Genetta tigrina, natural size. 

 A, dorsal surface. B, lateral external surface. C, median or inner surface of 



right hemisphere. 

 cc, corpus caUosum ; cms, calloso-marginal sulcus ; c, notch representing crucial 

 sulcus ; d, depression on superior lateral gyrus ; h g, hippocampal gyrus ; 

 i, inferior lateral gyrus ; in, middle lateral gjrus ; ol, olfactory lobe ; 

 OS, supraorbital sulcus ; s, superior lateral gyrus ; & f. Sylvian fissure. 



In Viverra civetta the crucial sulcus is slightly more marked, 

 and the supraorbital sulcus rises higher, than in the Genet. The 

 calloso-marginal sulcus runs forward and joins the rudimentary 

 crucial sulcus. That part of the inferior lateral gyrus which lies 

 in front of the Sylvian fissure is as large as, or larger than, the part 

 behind the Sylvian fissure, and may be subdivided by a sulcus. 



In Faradoxurus that part of the inferior lateral gyrus which is 

 behind the Sylvian fissure is wide, and bears a V-shaped sulcus. 

 There is hardly even a rudiment of the crucial sulcus. 



In Nandinia the brain is as in Genetta, save as regards that part 

 of the inferior lateral gyrus in front of the Sylvian fissure, which part 

 is as in Civetta. 



In Arctictis that part of the inferior lateral gyrus which is behind 

 the Sylvian fissure is wide, and bears a Y-shajjed sulcus ; and the 

 superior lateral gyrus has additional depressions. The crucial sulcus 

 is distinct, but small ; and the calloso-marginal sulcus joins it and 



