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Show 1873.] OF THE SUMATRAN RHINOCEROS. 103 the fissure between the two extends upwards to the left lateral suspensory ligament, and therefore nearly through its whole surface ; posteriorly it only extends up about two thirds the distance. The median suture, between the left and right central lobes, extends halfway up the organ anteriorly, and not quite so far posteriorly, where it is stopped abruptly by a transverse bridge of hepatic tissue. The left central lobe is triangular, prismatic, and elongate, coming to a point below on a level with the general contour-line. One flat surface of this prism, the largest, is directed forwards ; and the other two are wedged between the left lateral and right central lobes. The right central lobe is less differentiated from the right lateral than those just described are from one another, the fissure only extending upwards a short distance; and it is itself cleft to nearly the same extent near the middle of its truncated inferior border. The right lateral, the lobe second in size, is suboval and simple, with the margin entire. Mesially it slightly overlaps the right central lobe at its inferior corner. The caudate is a very considerable lobe, shaped much like the left central, but larger ; it is elongate, ovate, prismatic, and pointed at its free end. The largest side is directed forwards; and the external margin of the right lateral overlaps it considerably. It is 15,§ inches long, the whole liver, when lying on a flat slab, measuring 22 inches across, and 14 inches from above downwards. In no part does it measure more than 3| inches from before backwards. The Spigelian lobe is most peculiar, mainly consisting of a thin strip of hepatic tissue, 8 inches long, uniformly f inch wide, and | inch deep. At its attached end it becomes somewhat larger, and presents a free border superiorly for about an inch. There are three large hepatic veins, which spring just above and behind this lobe, on their way to the vena cava. The pancreas is irregular, not large nor concentrated. The spleen is very thin and flat; it forms an elongated oblong, rounded at one end and squared at the other. Its length is 25 inches, and breadth 8 inches. It is slaty in colour, and weighs 2f lb. The kidneys are flattened and oval in form. One is 6 inches broad by 9 inches long. They are nearly equal in size, and together weigh 10 lb. The hilum is linear, and on the inferior surface, not at the margin. They are lobulated externally, but not so much as in the Seals. The heart presents no peculiar features. The whole organ weighs 10 lb. when emptied of clots. The annulus ovalis is well marked, and forms a considerable fold over the fossa ovalis. The commencing aorta, which is 4 inches long and 3\ inches across, divides into two nearly equal branches, one of which is continued on as the arch of the aorta, with a diameter of 1*85 inch; the other gives off the vessels to the head in the following manner. Immediately after the main division of the vessel into two parts, the innominate gives off the left subclavian, which, again, is much divided up. The innominate then, 3 inches above its origin, divides into the right subclavian and the common carotid trunk, which latter, after a simple course |