. On the anatomy of vertebrates [electronic resource] . folds. Beside the falcial fissure, 15, there isa prefrontal secondary fissure ; and the septal or post falcial sur-face, ]/, </*, is extended by secondary fissures. The increase andcomplexity of the upper convoluted surface of the hemispheres inthe larger Perissodactyles are due to the full establishment ofprimary fissures, upon the plan sketched out in Hyrax, to theirmore wavy course, and to the superaddition of secondary fissures,indicated by interrupted lines in figs. 97 and 98. In passing from the Pigmy Musks to the brains of large
. On the anatomy of vertebrates [electronic resource] . folds. Beside the falcial fissure, 15, there isa prefrontal secondary fissure ; and the septal or post falcial sur-face, ]/, </*, is extended by secondary fissures. The increase andcomplexity of the upper convoluted surface of the hemispheres inthe larger Perissodactyles are due to the full establishment ofprimary fissures, upon the plan sketched out in Hyrax, to theirmore wavy course, and to the superaddition of secondary fissures,indicated by interrupted lines in figs. 97 and 98. In passing from the Pigmy Musks to the brains of larger Artio-daetylcs, we find the fissure which is feebly indicated at 10, fig. 101 102 103. Tragulus. 101, Tragulus, fully developed in figs. 102 and 103, and di-viding the triangular tract into the oblique folds / and g : which Ihold to include the same parts of the cerebrum as the more longi-tudinally disposed folds lettered g, I, m, in Carnivora. In somesmall Cervidce the secondary fissure, 11, is not present: in most it is,as also in the hollow-horned Ruminants, Giraffe, Camel-tribe, , Auchenia, Suidce,fig. 104, and Hippopotamus. The lambdoidalfissure, 13, retains its character, as in Tragulus, viz. short, ante-riorly convergent, and continued on the inner surface of the hemi- PKOSENCEPHALON OF MAMMALS. 123 104 105 sphere; not so longitudinally extended along the mesial margin of thehemisphere as in Hyrax and folds, / and m,figs. 102-105,comeinto contact at the middle part of theinterhemispheral fissure, and showtheir character as medial ones, in thelarger Artiodactyles. In Cervus, ,1 and g blend anteriorly, and arecontinued into the frontal tract
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