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ON GELADA RUEPPELLI. 509 
abdominal surfaces of the right and left central lobes are frequently 
connected by a bridge of hepatic tissue. The inferior margin of the Page 455. 
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 fora 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 down- 
wards. 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 real 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 Macacus 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 Macacus, towards the portal fissure), when com- 
plicated, is rendered so by a short fissure running from the superior 
border of the lobe, not parallel to the left lateral fissure, but down- 
wards and inwards, so as to produce a subtriangular lobelet, in which 
the free margin is directed horizontally upwards. When compli- 
cated the right lateral lobe develops lobules on its abdominal] sur- 
face, not semilunar incisions. The caudate lobe runs to the extreme 
margin of the right lateral lobe, as in Macacus. The Spigelian lobe 
