OCR Text |
Show 1882.] PROF. ST.-GEORGE MIVART ON THE ALUROIDEA. 511 The right central lobe has a short and wide cystic fissure, through which the gall-bladder appears. That portion of the right central lobe which is on the right of the gall-bladder also appears to be more in excess of the portion which is on the left of the gall-bladder than it is in Genetta tigrina, and thus more to resemble its condition in the Cat. This appearance is caused by the circumstance that, in the Civet, the large right lateral lobe comes down and excludes from view (on the abdominal surface) all that part of the right central lobe which lies to the right of the gall-bladder. The left central lobe is quite hidden from view when the abdominal aspect of the liver is seen. The Spigelian lobe is much stouter than in the Genet, and is not grooved. In Paradoxurus larvatus the liver is like that of the Genet, except that the caudate lobe has become very large at the expense of the right lateral; so that, on the diaphragmatic surface, the right lateral lobe appears as a triangle between the caudate and the large right central lobes. There is no gall-bladder ; nevertheless the right central lobe is notched as in the Genet. The left lateral and left central lobes present, on their diaphragmatic surface, an appearance similar to that which they present in Genetta. The posterior (gastric) aspect of the liver is also much as in the Genet, save that the caudate lobe is very large and the Spigelian lobe smaller, not grooved and slightly bifurcated at its apex. In Nandinia the diaphragmatic aspect of the liver is much as in Viverra, but the right lateral lobe is smaller in proportion to the right central, though not so much smaller in relation to it as in Genetta. The right central is deeply notched at its ventral margin, but does not show any gall-bladder. The left central lobe is rather smaller in proportion to the left lateral than in Viverra, and is larger in proportion to its breadth. The left lateral lobe is nearly bisected by a transverse fissure which runs inwards from its lateral margin. The abdominal (gastric) aspect of the liver shows a caudate and a Spigelian lobe nearly as in Genetta. The left central is quite excluded from view. That part of the right central lobe which is on the fight of the gall-bladder is more in excess of the part on the left, and is much as it is in the Cat. In Arctictis, on the diaphragmatic aspect of the liver, the right and left segments appear nearly equal; the right lateral and right central lobes are also nearly equal. The latter has two ventral notches, the one more to the right being the cystic notch. No gallbladder, however, appears. The proportions of the left lateral and left central lobes are much as in Nandinia; but the apex of the left central is separated off by an oblique transverse groove. The posterior aspect of the liver is very like that of the liver of Nandinia ; but there is no transverse groove on the left lateral lobe. That portion of the right central lobe which is on the right of the cystic notch is smaller than the portion which is on the left of that notch. The latter portion has four or five superficial fissures. In this condition of excess in the left portion of the right central lobe Arctictis differs from Felis, Genetta, Viverra, Paradoxurus, and Nandinia. |