AUSTRALIAN PHALANGERS. 



slightly larger than in Trichosurus. The portal vein, 

 artery, and common dnct pass between the spigelian and 

 caudate lobes. The hepatic course of the inf. v. cava is 

 not seen. 



Mesial or ('//stir Lobe. — The left cystic is completely 

 hidden by the left lateral, also the greater part of the 

 intermediate cystic, and partly the gall bladder cleft — 

 otherwise it is similar to Trichosurus. 



Bi/jht Lateral Lobe. — On its dextral margin a small 

 fissure is noted. The lobus caudatus is proportionately 

 larger than in Trichosurus, and forms a greater part of 

 the concavity for the right kidney. In connection with 

 the lobus caudatus in both Trichosurus and Pseudochirus 

 the following points must be noted: — 



(1.) Good development. 



(2.) Comparative mobility. 



(3.) Relation to the upper pole of the right kidney. 



(4.) The inf. v. cava is not visible in its hepatic 

 relationship. 



Gall Bladder and Ducts in Phalangers. 



The ({all Bladder is dextrally placed, and is seen both 

 on the ventral and dorsal surfaces, since there is a gap in 

 the mesial lobe between the small right and large inter- 

 mediate portions where it is lodged — the gap being nearly 

 1 cm. wide. It is a somewhat elongated body, and rarely 

 is found projecting beyond the ventral edge of the 

 liver, though in Pseudochirus I have seen it projecting 

 1.5 cm. beyond. It measures about 2.5 cm in length, 

 though in an adult male specimen I found the bladder 

 was only 1 cm. long, and lay in the dorsal part of the cleft. 



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