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Show 12 MR. F. F. NEDDARD OX T1IE [Jan. 17, umbilical ligament, Chlamydosaurus differs from 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 *. Ventral view of liver of Iguana, to show relation of umbilical ligament. G., gall-bladder; L ., liver; oe., oesophagus and stomach ; U., umbilical ligament. In Physignathus the arrangement of the umbilical ligament (text-fig. 8, p. 13) 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 Lizard furthermore differs from Text-fig. 7. |