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Show 1870.] PROF. W. H. FLOWER ON MLURUS FULGENS. 755 The feet are very broad, and evenly rounded in front. The following table * shows the relative length of the five digits of each foot, measured from a common base-line, the hinder edge of the palm or sole, as the case might be, to the tip of each claw :- Manus. Pes. 1st digit 2-1" 3*5" 2nd „ 2*9 4*3 3rd ,, 3*3 4*6 4th „ 3*1 4*4 5th „ 2*7 4*1 THE BRAIN. The general form of the brain, and the arrangement of the sulci and gyri of the hemispheres, are shown in figs. 1, 2, and 3. The length of each cerebral hemisphere was 22", and the greatest width of the entire brain near the posterior part of the hemispheres 1*8". The cerebral capacity, taken from a cast of the interior of the skull, was 3 cubic inches. Both the form of the hemispheres and the disposition of the gyri upon their surface are eminently characteristic of the arctoid group of the Carnivora, as pointed out in P.Z. S. 1869, p. 482. They resemble very closely those oi Procyon. It should be remarked that there is a noticeable want of exact bilateral symmetry. The sylvian fissure (S) is situated rather behind the middle of the side of the hemisphere, and inclines upwards and backwards, being nearly *6" long. The internal gyrus (ii), which immediately surrounds it, has the anterior limb much narrower than the posterior ; the angle at which the gyrus is folded on itself above is very acute; the lower part of the posterior limb is broad, and indented by a short sulcus descending from the middle of the sylvian fissure, and which is not found, or is only slightly indicated, in Ursus, Procyon, and Nasua. The middle gyrus (m mi) is of nearly uniform thickness throughout, is marked by a few secondary sulci, and surrounds the internal gyrus in the whole of its extent. The superior gyrus (s s) is large and complex. Commencing in the supraorbital region, close to the root of the olfactory lobe, it passes forwards and inwards, and winds round the supraorbital sulcus (0) ; then it bends outwards round the strongly marked crucial sulcus (C), behind which it is very broad, and almost divided into two by a well-marked longitudinal sulcus. In the middle of the hemisphere, above the apex of the sylvian fissure, it is narrower and straight. Posteriorly it winds round the middle gyrus, and forms the hinder margin of the hemisphere, being distinctly divided from the middle gyrus almost as far as the lower border of the temporal lobe. On the left side, however, there is a bridging convolution (*) between these two gyri, wanting on the right. * From notes kindly taken for me by my friend Mr. John C. Galton. M.A. |
