. On the anatomy of vertebrates [electronic resource] . /, medilateral or supersylvian, y, andsylvian, e; but, shorter and more bent as they recede from themiddle line ; with indications of a longer anterior lobe or hippocampal fissure is prolonged into a e post-hippocampal,fig. 110, a!, as in higher Quadrumana. In the diminutive Platyrhine (Midas, Geoffr., figs. 109, 116) thesmoothness of the upper surface of the hemisphere is broken onlyby the extension thereon of the sylvian fissure, 5. In the nextstage (Callithrix) a i postsylvian fissure, ib. 9, is added, andthe hemisphere may a
. On the anatomy of vertebrates [electronic resource] . /, medilateral or supersylvian, y, andsylvian, e; but, shorter and more bent as they recede from themiddle line ; with indications of a longer anterior lobe or hippocampal fissure is prolonged into a e post-hippocampal,fig. 110, a!, as in higher Quadrumana. In the diminutive Platyrhine (Midas, Geoffr., figs. 109, 116) thesmoothness of the upper surface of the hemisphere is broken onlyby the extension thereon of the sylvian fissure, 5. In the nextstage (Callithrix) a i postsylvian fissure, ib. 9, is added, andthe hemisphere may also show a longitudinal fissure, fig. 116, 8,12, curving, like the supersylvian, over the end of the sylvian, h,and postsylvian, 9, fissures ; but which, in relation to th« inter-hemispheral fissure, corresponds rather with the latera1, fig. 89, 11,of Carnivora: the large anterior tract may show a short frontalfissure, fig. 104, u. In all the small Platyrhines (Midas, Colli-1 cir. This lias also the character of the 4 supcrcallosal, 7, fig. 117. 110. 126 ANATOMY OF VERTEBRATES. thrtx, fig. 109) the sylvian fissure, 5, and fold, e, are directedmore obliquely from above and behind, downward and forward,than in the Aye-aye, ib., and most Lemuridae : this characterappears to be due to the preponderating growth of the frontallobes, and becomes more marked as the Quadrumana rise in thescale. We next find that each hemisphere is divided into ananterior, middle, and posterior tract or region by two deep andextensive fissures, 12 and 13, Macacus, fig. 109, and Cebus, fig. 116,which, from their respective correspondence in position with thecoronal and lambdoidal sutures, bear the same names. In Cebus the sylvian fissure, fig. 116, 5, is overarched by asubangular one denning the fold, g; fromthe angle a fissure, 13, extends to the inter-hemisphcral one, and is continued deeplydown the inner or mesial surface. Out-wardly the lambdoidal fissure, 13, definesand undermines a posterior part o
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