WOMBAT. 



laterally. To the left of this two portions are seen, which 

 are continuous on the visceral surface, but are separated 

 on this aspect by a partly fibrous depression or groove. 

 These represent the intermediate cystic or mesial lobe. 

 To the left of these two parts another short fissure is seen 

 -the intermediate mesial or cystic fissure. Between the 

 dorsal extremity of this and the inf. v. cava runs the sus- 

 pensory ligt. Between this fissure and the remnant of 

 the left lat. fissure is a small fiat portion — the remains of 

 the left mesial or cystic portion of the tripartite cystic 

 lobe. It is here part of the left (lat.) lobe, and the inter- 

 mediate mesial portions are really left mesial. As re- 

 gards these two intermediate portions it would appear 

 that the anterior part (2 cm. long, and 1.25 cm. laterally) 

 is atrophying and separating off — the lower part (2 cm. 

 long, and 1.75 cm. laterally) corresponding to the human 

 lobus quadratus, i.e., between the suspensory ligt. and the 

 gall bladder cleft. With subsequent atrophy of this por- 

 tion the gall bladder cleft would be connected with the 

 suspensory ligt. In this direction evolution is trending, 

 and without doubt the atrophied lobus quadratus occa- 

 sionally described in connection with the human liver is 

 indicative of the trend. 



Visceral Surface. — As on the diaphragmatic surface 

 the chief interest is centred round the mesial or cystic 

 lobe. Here the lower parts of the left mesial and inter- 

 mediate have become incorporated in the left (lat.) lobe. 

 Ventrally, the remains of the left mesial, 2.5 cm. long, and 

 1.5 cm. laterally, is seen, and in spite of a depression on 

 this aspect and the slight Assuring on the ventral edge it 

 has become incorporated into the left (lat.) lobe. So that 

 as a distinctive portion the left mesial or cystic lobe has 

 disappeared, having become incorporated in the left lat. 

 lobe. The intermediate lobe (now the left mesial or 

 cystic) is separated on the left side by a narrow cleft or 



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