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Show 526 MR. F. E. BEDDARD ON THE BRAIN AND [June 14, on both sides ; about half an inch away from the intestine a fold arises from the mesentery supporting the intestine, which crosses over the intestine itself and is attached to the caecum ; a deep pocket is thus formed which is of course floored by the caecum ; on the opposite side there is a corresponding fold, arising, however, rather further away from the intestine ; this also crosses the intestine and becomes fused with the fold running directly from the intestine to the caecum. The caecum is thus supported by three distinct folds, of which the median one, that arising from the intestine, is practically anangious ; the two lateral folds which arise from the mesentery on the side furthest away from caecum bear blood-vessels. III. BRAIN. The brain showed, after preservation in alcohol, the following proportions :- Total length (to end of cerebellum) 37 m m. Length of hemispheres 24 m m. Greatest breadth 24 m m. Vertical diameter 16 m m. The outline of the brain as seen from above is shown in the accompanying drawing (woodcut, fig. 2). The two hemispheres Fig. 2. Brain of Aulacodus, viewed from above. Sy, Sylvian fissure; a, longitudinal furrow. are broader behind than in front; up to the Sylvian fissure the outer borders of the two hemispheres are approximately parallel to each other, though their outline is, of course, curved; from the Sylvian fissure to the anterior extremity of the brain these margins converge slightly, the diameter of the anterior extremity of the brain being 11 m m . The form of the hemispheres is in fact more like that of Octodon and Myopotamus among the immediate allies of Aulacodus: there is less similarity in the general shape of the |
