OCR Text |
Show 1870.] PROF. W. H. FLOWER ON JELURUS FULGENS. 757 Inner surface of left cerebral hemisphere; natural size. CMS. Calloso-marginal sulcus. C. Crucial sulcus, s. Superior external gyrus, h. Hippocampal gyrus. On the inner side of the hemisphere, the crucial sulcus (C) is strongly marked, running obliquely backwards. The horizontal portion of the calloso-marginal sulcus (CMS) is short, not extending further forward than over the middle of the corpus callosum ; so that, anteriorly to this spot, the internal or hippocampal gyrus (h) is not distinguishable from the superior (s). Posteriorly the sulcus bends downwards and forwards at a sharp angle, separating the hippocampal gyrus in front from a broad descending portion of the superior gyrus (s) behind. The latter is divided by a strong!v marked sulcus, lying parallel with the descending portion of the calloso-marginal sulcus, into two parallel portions of nearly equal breadth. The corpus callosum is *9" in length. The cerebellum is 1*3" broad, and projects by nearly half its antero-posterior length behind the posterior margin of the cerebral hemispheres. It appeared to present no notable difference in form from that of other allied species. MOUTH, TONGUE, AND LARYNX. The mucous membrane lining the buccal cavity is smooth, and of a pale pink colour, but black at the edges, especially upon the inside of the upper lip. The gums surrounding the incisors, especially the upper series, are mottled with black. The palate is of very peculiar form ; it is concave immediately behind the incisor teeth, then becomes convex between the posterior premolars, and is hollowed again between the true molars. The ridges are not very prominent or regular ; those placed most anteriorly form a wide curve with the concavity backwards, extending completely across the palate, though slightly broken in the middle line; they gradually slope more and more backwards at their outer ends. Behind the seventh there are two or three not quite symme- |