. The brain as an organ of mind. Brain; Thought and thinking; Brain. Chap. XYII.] THE BRAIN OF QUA DRUM ANA. 291 R spondiDg fissQi-es in any Lemur (fig. 103) in which they are present. The Howler, like the Marmoset and the Squirrel Monkey, is a New World form. The former, in fact, is the largest of the series, and is usually supposed to helong to the highest group of these American Monkeys. Its hrain, however, is very poorly developed (fig. 109), and, consider- ing its size, possesses y- very few surface markings. It is re- K markahle chiefly for the very small size of the Occipital, and the F
. The brain as an organ of mind. Brain; Thought and thinking; Brain. Chap. XYII.] THE BRAIN OF QUA DRUM ANA. 291 R spondiDg fissQi-es in any Lemur (fig. 103) in which they are present. The Howler, like the Marmoset and the Squirrel Monkey, is a New World form. The former, in fact, is the largest of the series, and is usually supposed to helong to the highest group of these American Monkeys. Its hrain, however, is very poorly developed (fig. 109), and, consider- ing its size, possesses y- very few surface markings. It is re- K markahle chiefly for the very small size of the Occipital, and the Fig. no.—Brain of the Mangabey (Cercopifhecus „ ,, ^ , , f (ethiops), upper aspect. (Vogt.) F, Frontal; P, Parie- lUli development OI tal; and O, Occipital Lobes. L, Great Longitudinal the TemnOral Lobes fissure; R, Fissure of Rolando; V, External Perpen- , , dicular Fissure ; K, Operculum. A, A, Ascending In connection with Prontal; a\ cC-, o3, First, Second, and Third Tiers of the very small Occi- ^,^«J!'^\^^"T;^"^^«";-^^' ^' Ascending Parietal; 6i, •^ 6-, First and Second Tiers of Parietal Convolution?. pital Lobes, Flower * «', cV^, First and second Tiers of Occipital Convolu- liaS noted an almost ^-pj^-g gij^ple nomenclature for the Convolutions is complete absence of t^^* ^^ ^- Wagner, excepting that A, and B, are £_, named by him Anterior and Posterior Central Cou- tne -hiXternai and In- volutlons. Ihough it is a terminology which is by fprnnl P'^mpndlCnlir ^^ means without merit, it has not been commonly '^ -'• ^ adopted.) Fissures. The brain of the Howler Monkey is also remarkable for the extreme backward extension of the Sjdvian Fissures (f, f), each of wiiich almost reaches the upper and inner border of its corresponding hemisphere. * "Proceed, of Zoolog. ; 1864, p. 335, PI. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearan
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