1873.J 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 -| inch wide, and 

 5 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 bead 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 innomi- 

 nate then, 3 inches above its origin, divides into the right subclavian 

 and the common carotid trunk, which latter, after a simple course 



