LIVEh OF AUSTRALIAN PHALANGERS. 



(TRICHOSURUS AND PSEUDOCHIRUS), 



(1. ) Trichosurus. — • Diaphragmatic Surface. — The 

 liver in this Phalanger lies in the epigastric and right and 

 left hypochondriac region, and, as in the Platypus, there 

 is a well marked separation of the right lateral, left lateral, 

 and mesial lobes. The dextral margin is seen to be longer 

 than the sinistral, and the ventral than the dorsal. 



Three features are to be noted, viz.: — 



(a) The relatively small size of the right lat. lobe 



compared with the left lat., and the cystic, 

 or mesial lobe. 



(b) The gall bladder is somewhat dextrally placed 



on the cystic lobe. 



(c) As in the Monotremes, a small portion of the 



lobus eaudatus is seen on the dextro-dorsal 

 aspect of the right lat. lobe. 

 The liver measures dorso-ventrally 7 cm., and late- 

 rally 10 cm. 



Mesial or Cystic Lobe. — This presents three divisions, 

 viz., right, intermediate, and left. Of these the right is 

 the smallest, and the intermediate the largest. Between 

 the intermediate and right portions is the cleft, 2 cm. long, 

 and the width, .75 cm. — sometimes fissured below — for the 

 gall bladder, extending from the dorsal to the ventral 

 surfaces, so that the gall bladder is seen on each aspect. 

 This lobe is separated from the right lateral by the right 



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