The brain as an organ of mind . active Marmoset (), the Cerebral Hemi-spheres are relativelyargcr, so that they com-pletely cover and evenslightly overlap the pos-terior border of the Cere-bellum. They are, how-ever, quite smooth andwholly devoid of convolu-Only one fissureis seen—theSylvian—forming the boundary lino Ix^twoen pjirts which will subse-quenlly be spoken of as the Parietal and the TemporalLobes.* In the Squirrel Monkey, another small alliedform also notable for its extremely active habits, a fissure;below and behind the Sylvian is added—known as the* ])arM,nel fissure (fig.
The brain as an organ of mind . active Marmoset (), the Cerebral Hemi-spheres are relativelyargcr, so that they com-pletely cover and evenslightly overlap the pos-terior border of the Cere-bellum. They are, how-ever, quite smooth andwholly devoid of convolu-Only one fissureis seen—theSylvian—forming the boundary lino Ix^twoen pjirts which will subse-quenlly be spoken of as the Parietal and the TemporalLobes.* In the Squirrel Monkey, another small alliedform also notable for its extremely active habits, a fissure;below and behind the Sylvian is added—known as the* ])arM,nel fissure (fig. 105, 9). This runs along the centreof tlio TcMuporal Lobe, and backwards towards the upperand inner edge of the Hemisphere. Both these fissuresare less vertical and slope backwjirds more than the corre- * Tlic names of these lobes of ilio Brain nre derived from thoseof the bones of the skull ac^ainst which they lie. Ihe two lobesabove named together constilnto what was formerly prineipallyripokeii of as the Midillo Fin. 100. — (it tiio iidwlor Monkey (/I///cetcs), Hccn from iibovo. (Duiicjui.) Ij, Lungitu- tlOUSdiual ; F, Fissuro of Sylvius. CiiAP. XVII.] THE BRAIN OK QIJADHUMANA. 291 sj)oii(liiio; fissures in any Lomur (lio-. 10:3) in which ih(>yarc present. The Howler, like the Marmoset and the SquirrelMonkey, is a New World form. The former, in fact,is the larn-cst of theseries, and is usuallysupposed to helongto the highest groupof these AmericanMonkeys. lis l)rain,however, is verypoorly developed (lig,]()!)), and, consider-ing its size, possessesvery few surfacemarkings. It is re-markahle chiefly forthe very small size of the Occipital, and the Fm. no.—nram of the Manpabcy (CercopWiecus P i-i 1 1 , n aihiopH}, ui)pGr iiHjicct. (Vogt.) F, Kroiital; P, P^ric- lUU development OI tal; and O. occipital Lobes. L, Orcat Longitudinal the Temi)()ral Lobes. i««*o; H, Kinsurcof Uolando; V, ... <Hcular Fisstn-o ; K, Operculum. A,
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