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Show 516 PROF. ST.-GEORGE MIVART ON THE ALUROIDEA. [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. c c, corpus callosum * cm s, calloso-marginal sulcus ; c, notch representing crucial sulcus id, depression on superior lateral gyrus ; kg, hippocampal gyrus; *, inferior lateral gyrus; m, middle lateral gyrus; ofolfactorv lobe • os, supraorbital sulcus; s, superior lateral gyrus; Sf, Sylvian fissure. ' J* 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 Tfrn tSlS%That rt0fthG iDferi0r lateral gy-s which S ilfW? fi8SUre is as l a r S e as> or larger than, the part behind the Sylvian fissure, and may be subdivided by a sulcus. P h.h AV^TT^ a1 part °f the inferior lateral gy^s which is behind the Sylvian fissure is wide, and bears a V-shaped sulcus. 1 here is hardly even a rudiment of the crucial sulcus. nf L 7 i ^^ ,bFain is-aS in Genet/a> save as regards that part is as m1 ct"l gJmS " f'°nt °f the Sylvkn fiss^re' which Part In Arctictis that part of the inferior lateral gyrus which is behind the Sylvian fissure is wide, and bears a V-shaped sulcus; and the superior ateral gyrus has additional depressions!^ The crucial sulcus is distinct, but small; and the calloso-marginal sulcus joins it and |