KANGAROOS AND WALLABIES. 



greatest dorso-ventral measurement of 5 cm., and lateral 

 10 cm. The inf. v. cava is seen to run between right 

 lateral and mesial lobes and the spigelian lobe, and this is 

 seen to be continuous with the dorsal parts of both the 4 

 cystic and left lateral lobes. 



Left Lateral Lobe. — A striking feature is the rela- 

 tively large size of this lobe, which is seen to be separated 

 from the mesial lobe by an irregular fissure (left lat. fis- 

 sure), which does not reach the inf. v. cava dorsally, 

 where the left lateral — mesial — and spigelian lobes are 

 connected. This lobe measures 11 cm. dorso-ventrally, 

 and 9 cm. laterally. Behind the dos< (-internal promin- 

 ence of the left lateral lobe, between it and the spigelian, 

 and then on the left aspect of the spigelian, which is 

 grooved for it, we have the (esophagus passing to the 

 stomach. 



Mesial or Cystic Lobe. — This is separated from the 

 right lat. lobe by the right lateral fissure, which does not 

 frequently pass so far dorsally as the inf. v. cava, and 

 measures 9 cm. laterally and 7.5 cm. dorso-ventrally. It 

 is separated into two portions — the left smaller, and the 

 right larger — by the cleft for the gall bladder in front, 

 and the longitudinal ligt. dorsallv. The cleft, which may 

 be fissured dorsally, measures 3 cm. dorso-ventrally, and 

 3 cm. laterally, and the gall bladder is seen freely on this 

 aspect. Usually the ventral margin of the liver is formed 

 by the left and right lateral lobes, and so the gall bladder 

 is not seen at that edge. Sometimes* the right portion 

 of the cystic lobe may partake in the ventral margin, and 

 in the smaller varieties of the Macropodida3 the whole of 

 the mesial lobe may partake, so that the gall bladder is 

 seen on the ventral edge. 



30 



