12 



MR. F. E. BEDDARB OX THE 



[Jan. 17, 



umbilical ligament, Chlamydosaurus clifiers fiom at least some 

 others among the Agamidfe, but exactly agrees with Varanus, 

 where also the two umbilical ligaments form a V when seen in 

 transverse section : that is to say, the ligaments converge at their 

 insertion on to the liver and diverge to be inserted separately on 

 to the parietes. In the Skinks, on the other hand, the V is as it 

 were upside down ; the attachments of the ligaments to the liver 

 are separate and wide apart, but they converge to be inserted on 

 to the ventral parietes*. 



Text-fig. 7. 



Ventral view of liver of Iguana, to show relation of umbilical ligament. 

 G., gall-bladder ; i., liver; os., oesophagus and stomacli ; Z7., umbilical ligament. 



In Physignathtis the arrangement of the umbilical ligament 

 (text-fig. 8, p. 1 3) departs from that of Chlamydosaurus, and is really 

 more like that of the Skinks. The membrane has a double origin 

 from the last third of the liver and anteriorly is single. The 

 attachment to the ventral parietes is, however, single throughout. 

 The umbilical ligament of this Liza,rd furthei-more difi"ers from 



* See Beddard, " On Certain Points in the Visceral Anatomy of the Lacertilia, 

 particularly oi 3Ionitor" P. Z. S. 1888, p. 98; and Cope. P. Acad. Sci. Phil. 1896, 

 p. 308. 



