. On the anatomy of vertebrates [electronic resource] . 108 Hyrax. Giraffe. to the primary hippocampal, 4, callosal, 7, and entolambdoiclal, 13,fissures, shown by Tragulus and Hyrax, the marginal, 6, super-callosal, and falcial, 15; the supercallosal, which is interruptedin the Sheep and Ox, iscontinuous in the significant secondaryfissures impress both foreand hind parts of this sur-face. Below the sylvianfissure, 5, and fold, e, er,a narrow undulated e sub-sylvian fold, /, fig. 107,Giraffe, divides them fromthe ectorhinal fissure, 2 : itis not present, at least as aconvolute tra
. On the anatomy of vertebrates [electronic resource] . 108 Hyrax. Giraffe. to the primary hippocampal, 4, callosal, 7, and entolambdoiclal, 13,fissures, shown by Tragulus and Hyrax, the marginal, 6, super-callosal, and falcial, 15; the supercallosal, which is interruptedin the Sheep and Ox, iscontinuous in the significant secondaryfissures impress both foreand hind parts of this sur-face. Below the sylvianfissure, 5, and fold, e, er,a narrow undulated e sub-sylvian fold, /, fig. 107,Giraffe, divides them fromthe ectorhinal fissure, 2 : itis not present, at least as aconvolute tract, in Perisso-dactyles: it is well marked and rises high up the sylvian fissurein Proboscidians, fig. 108, We shall meet with this sub- or ento-sylvian tract again : it attains its greatest extent of surface in Elephant; side view of cerebral hemisphere. 124 ANATOMY OF VERTEBRATES. The sylvian, e9 and supersylvian, g, folds are more undulated,or interrupted, and less neatly denned in the Ungulata, at least inthe larger species, than in the Carnivora. They are still less de-fined in the richly convoluted brains of the Proboscidia, fig. 108,and Cetacea, fig. 94. With regard to the Ungulata the choice of 10 or 13 for the medi-lateral fissure 10, fig. 91, in Unguiculata, may long be undecided,and consequently the choice of 10 or n, for the homologue of thelateral fissure 11; but the determination of the supersylvian fissure,8, will probably be accepted, and on this basis, with the relations of13, 13, figs. 96—107, to the inner surface of the hemisphere, Iam now, as in 1842, guided in the above determinations. In the Lemurida the cerebrum does not extend over the wholeof the cerebellum, fig. 109, Aye-aye: it does so in both platy-rhine and catarhine groups : but there are species of Quadrumanam
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