KANGAROOS AND WALLABIES. 



Spigelian Lobe. — A well developed spigelian lobe is a 

 characteristic feature of the liver of Macropus. It pre- 

 sents three surfaces — an upper corresponding to the 

 under surface of the left lat. lobe, and a right and left 

 lateral for the stomach. At the dorsal part of the left 

 surface is a groove for the abdominal oesophagus, which 

 is of considerable length in the Macropodidre, and which 

 passes between the spigelian lobe and the dorso-mesial 

 projection of the left lat. lobe. It may project as far for- 

 ward as the level of the ventral border of the left lat. lobe, 

 and in Parry's Kangaroo I have seen it divided into two 

 lobes by a fissure. It dips down behind the lesser omen- 

 tum, between the two portions of the stomach, forming, 

 as it were, a separation between the two. 



Cystic or Mesial Lobe. — This is divided into two 

 parts by the cleft of the gall bladder — a larger right and 

 smaller left. The smaller left portion is always hidden by 

 the left lat. lobe, which extends dextrally as far as the 

 gall bladder cleft, so that only part of the bladder is seen 

 — the main projection of the bladder being on the dia- 

 phragmatic, or upper surface. The Cystic Duct passes 

 between the left lat. and the right cystic lobes, and the 

 Common Bile Duct, with the artery and portal vein, are 

 seen passing also in a groove between the right lateral and 

 spigelian lobes. 



Right Lateral Lobe. — Two portions, as on the dia- 

 phragmatic surface, may be recognized separated by a 

 partial fissure, viz., an upper small and a lower larger 

 portion hollowed below for the reception of the kidney. In 

 a Macropus Parryi, and in a young Wallaby, I have found 

 the upper portion to be more defined and mobile, project- 

 ing ventrally to the lower part and to the right cystic lobe 

 — the ' ' partial ' ' fissure extending to the vena cava. There 



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