WOMBAT. 



and more ventrally the colon is related to this surface. 

 On its inner aspect some Assuring may be noted. On its 

 ventral edge is a fissure (complete), 1.5 cm. long-, which 

 is prolonged dorsally as a depression or groove for 3 cm., 

 passing obliquely inwards to the right margin of the lobe. 

 This groove and fissure define a projecting lobnle (4 cm. 

 dorso- ventrally ) , which is now connected to the left 

 lateral lobe, and represents the remains of the left cystic 

 lobe — the groove and fissure representing the original 

 left lateral fissure. 



(B) Here the fissure was only .75 cm. long, and the 

 oblique groove, apart from its termination, was nothing 

 more than a faint depression, so that the fusion of the 

 cystic (left) and left lateral lobes was more pronounced 

 than in the preceding. 



(C) Here the separation of the left cystic lobe and 

 left lateral lobes was by a complete fissure (left lateral 

 fissure) 4 cm. long. 



(D) Here there was no fissure, even anteriorally, but 

 a well denned groove or depression, so that the old left 

 cystic was defined, and presented some secondary Assur- 

 ing and lobulation. 



Mesial or Cystic Lobe. — (A) The separation between 

 the left lateral and cystic lobes is by means of a fissure, 

 ventrally, and a groove dorsally reaching to the portal 

 interval — the total length of which may reach 7 cm., viz.. 

 fissure 3 cm., and groove 4 cm. The whole of this corre- 

 sponds to the longitudinal fissure of the human liver. The 

 fissure and groove represent the interval (cystic or mesial 

 fissure) seen in more primitive forms between the inter- 

 mediate cystic and left cystic lobes. With this fissure 

 the longitudinal or suspensory ligament is connected- 



47 



