PLATYPUS AM) ECHIDNA. 



right lateral — a dejn'ession running between the two 

 containing the inf. v. cava which is exposed in its hepatic 

 relation on this aspect and not hidden as in the Platypus ; 

 occasionally one sees a thin bridge of hepatic tissue over 

 the inf. v. cava anteriorally. Posteriorally at a pocket 

 between the spigelian and caudate lobes the inf. v. cava 

 comes into relation with the liver. Its exit corresponds 

 to the junction of coronal and oblique fissure and suspen- 

 sory ligament. The oblique fissure separating the spi- 

 gelian and left lateral lobes is complete to the coronal 

 fissure, and we see that the spigelian belongs to the right 

 and not to the left lateral lobe. The lateral lobes arc 

 almost equal in size and measure approximately 7 cm. 

 dorso-ventrallv and 8 cm. laterally, while in the cystic the 

 left laterally is 3 cm. and the right 7 cm. 



Diaphragmatic Relations. — In addition to the suspen- 

 sory fold a small fold may be occasionally seen passing 

 from the inner and back of the right cystic lobe to the 

 diaphragm. Compared with the Platypus the dorsal 

 margins of the cystic lobes are free, being unattached to 

 the diaphragm. As in the Platypus a fold is noted be- 

 tween the right lateral and spigelian lobes attached above 

 to the muscular and tendinous portions of the diaphragm 

 and traced to the wall of the inf. v. cava. The inner and 

 back part of the left lateral lobe is concave and a gap is 

 present between it and the spigelian lobes. Here the 

 oesophagus passes on to the stomach. 



A peritoneal fold is noted — attached above to the dia- 

 phragm — at the inner and back part of the left lateral 

 lobe, leaving internally a small triangular area between 

 the fold and the oblique fissure. It passes to the ventral 

 surface with the oesophagus and becomes continuous with 

 the gastro-hepatic omentum. About the exit of the vena 

 cava between the two coronal fissures it is continuous with 

 the suspensory ligament. 



