OCR Text |
Show 1879.] PROF. A. H. GARROD ON GELADA RUEPPELLI. 455 connected by a bridge of hepatic tissue. The inferior margin of the right central lobe is straight, and at right angles to the axis of the gall-bladder, which latter organ is deeply imbedded in a cystic fossa, never deep enough to appear on the diaphragmatic surface. The fundus of the gall-bladder never reaches the inferior margin of the organ, though it approaches very near to it. There is no trace of a cystic fissure. The interval between the inner border of the cystic fossa and the umbilical fissure is always broad, a quadrate lobule intervening. The left central is generally the smallest of the four main lobes, it being vertically elongate. The left lateral lobe is shaped much like the sector of a quarter of a circle, with the apex directed to the portal fissure. This apex is often simple; but when not so a slight fissure runs for a short distance from the superior border of the lobe, not far from the apex, parallel to the left lateral fissure. The right lateral lobe is subquadrate in form ; its surface presents no irregularities, as a rule; but when present they take the form of deep semilunar incisions on its abdominal surface. The abdominal margins of the umbilical fissure frequently present small lobelets of a bluntly conical form, with their apices directed downwards. These are most frequently situated on the left central lobe, but sometimes on the right, sometimes on both. The caudate lobe is elongatedly subfusiform, without any renal depression; its apex reaches as far as the extreme right margin of the right lateral lobe. The Spigelian lobe is well marked, being small and thin ; its shape is that of the tip of the compressed finger of a glove ; it is directed backwards. The genus Cercopithecus differs from 31acacus in the following respects :-The inferior margin of the right central lobe is rarely anything approaching a straight line at right angles to the axis of the gall-bladder; a slight notch often also indicates the rudiment of a cystic fissure. The imbedded fundus of the gall-bladder is likewise generally visible on the diaphragmatic surface of the right central lobe. The interval between the left margin of the cystic fossa and the umbilical fissure is narrow, and often not more than a sharp vertical ridge of hepatic tissue. The apex of the left lateral lobe (directed, as in 31acacus, towards the portal fissure), when complicated, is rendered so by a short fissure running from the superior border of the lobe, not parallel to the left lateral fissure, but downwards and inwards, so as to produce a subtriangular lobelet, in which the free margin is directed horizontally upwards. When complicated the right lateral lobe develops lobules on its abdominal surface, not semilunar incisions. The caudate lobe runs to the extreme margin of the right lateral lobe, as in 3Iacacus. The Spigelian lobe is frequently absent, and when present is irregular and much smaller than in Macacus. In the genus Cynocephalus the peculiarities of Cercopithecus are observed, except that the caudate lobe is very short, only extending half across tbe right lateral lobe horizontally. The Spigelian lobe is also well developed, quite as much or even more so than in 3Iacacus, it being thicker than in that genus. |