The brain as an organ of mind . rum is very short and the Sylvian Fissurealmost non-existent. Among them, in fact, no species existsof sufficient size to possess sulci on its surface. But this,as Flower remarks, is not so very surprising wdien suchmarkings are almost absent in the brain of a true Primateof even larger size (Hapale).** For, in regard to convolu-tional development, the same primary rule holds goodamong Quadrumana as with Qaadi-ui)e(ls, viz., that, taking * Traus. of Zoolog. Soc. 18JG, vol. v. p. cit., p. 109. Chap. XVIL] THE BRATN OF QUADRUMANA. 289 representatives of t
The brain as an organ of mind . rum is very short and the Sylvian Fissurealmost non-existent. Among them, in fact, no species existsof sufficient size to possess sulci on its surface. But this,as Flower remarks, is not so very surprising wdien suchmarkings are almost absent in the brain of a true Primateof even larger size (Hapale).** For, in regard to convolu-tional development, the same primary rule holds goodamong Quadrumana as with Qaadi-ui)e(ls, viz., that, taking * Traus. of Zoolog. Soc. 18JG, vol. v. p. cit., p. 109. Chap. XVIL] THE BRATN OF QUADRUMANA. 289 representatives of the same genus or family, small formscommonly have comparatively smooth brains; whilelarger animals present, in proportion to their size, moreand more richly convoluted Cerebral Hemispheres. In some of the Lemurs the Cerebral Hemispheres areso small as not to cover more than one-half of the Cere-bellum. There is, indeed, a kind of gap between thelower and the lowest Simians—that is between the old Fig. 104. Ftg. 105. Fig. Fig. Fig. 103, Fig. 106. Fig. 103.—Brain of an Aye-aye, one of the Lemurs. Fig. 104.—Brain of the Marmoset (Midas). Fig. 105.—Brain of the Squirrel-Monkey (Ca^^i^/irja:). Fig. 106.—Brain of a Macaque. Fig. 107.—Brain of a GibboTi. Fig. 108.—Brain a 5th n^aith Human Foetus. (Owen.) and new world Apes and Monkeys, and the Lemurs. Every Lemur which has yet been examined, says , has its cerebellum partially visible fromabove, and its posterior lobe, with the contained posteriorcornu and hippocampus minor, moie or less rudimen-tary. Every Marmoset, American monkey, old worldmonkey, Baboon, or Man-like ape, on the contrary, hasits cerebellum entirely hidden, posteriorly, by the cere-* Mans Place in Nature, p. 96. 200 THE BRAIN OF QUADRUMANA. bral lobes, and possesses a large posterior cornu witha wcU-dovelopcd hippocampus minor. In the smallest Lemurs, the Hemispheres are quitesmooth, or, at most, show traces of one primary fissure
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