1904.] ANATOMY OP THE LACERTILIA. 467 



branch in Iguana ainses further back upon the carotid stem and 

 has a shorter course before dividing into its several branches. 



The Lungs and their attachment. — Mr. G. W. Butler* has 

 pointed out that " the Teiida? are the only family in which I 

 have met with the condition in which the lung of each side 

 is suspended freely by its more dorsal ligament, with a con- 

 sequent absence of pulmo-hepatic recess." t In an accompanying 

 diagram the absence of any pulmo-hepatic ligament is shown 

 and contrasted with its presence in such a type as Iguana. As 

 a matter of fact, Tiliqua scincoides agrees with Tiqnnamhis in 

 the free suspension of the right lung ; but in both of them the 

 difference from Iguana &c. is only a difference of degree. In 

 both of the former genera there is a short membrane attaching 

 the right lung to the anterior part of the liver; it is obvious, 

 though rudimentary. A difference which Tupinambis shows 

 from some other types in the attachment of the right pulmonary 

 membrane is this : in the Teguexin the suspensory ligament is 

 attached up to the very tip of the lung and extends considerably 

 iDeyond the hmg, ending, as it does, upon the posthepatic septum. 

 Anteriorly the membrane is attached to the hepato-oesophageal 

 ligament ; it is then attached to the oesophagus at its dorsal border 

 n.nd so continues to the end. In Tiliqiia the pulmonary ligiirment 

 does not extend to the tip of the lung ; it is inserted at first on to 

 the oesophagus, and more posteriorly, where the cesophagus bends 

 to the left, to the ligament, continuous with tlie hepato-oesophageal 

 ligament, which binds the liver to the mid-line of the dorsal parietes. 

 On the left side the pulmonary ligament again extends to the veiy 

 tip of the lung in Tupinambis. The membrane is attached first 

 to the gastro-hepatic ligament ; it then becomes inserted on the 

 stomach and is continued backwards through the large foramen in 

 the posthepatic septum on the left side, whence it may be traced 

 as far as the spleen and the left gonad. The spleen and the left 

 gonad, it may be remarked, lie much closer together in this lizard 

 than they do in either Iguana or Tiliqua. In the two latter 

 genera the pulmonary ligament of the left lung does not quite 

 reach the end of that viscus ; moreover, from the very first there 

 is an attachment to the cesophiigus, a separate fold of membrane 

 in both these types binding the left lung to the gastro-hepatic 

 ligament. Posteriorly the left piilmonary ligament may be 

 observed to reach the spleen but not the gonad. 



The Liver, its Suspensory Ligaments and Veins. — The liver of 

 this reptile is figured by Butler j in several a spects ; but the shape 

 of the liver in the example stxidied by myself is not quite identical. 

 It must be borne in mind, however, that we are dealing with 

 different species. The falciform ligament suddenly bends to the 

 left and lies in a cleft of the left lobe of the liver into which enters 



* Loc. cit. p. 465. 



t Later, however (P. Z. S. 1892, p. 481), ho finds that certain skinks .agree witli the 

 Teiida} moi"e or less. 



X Loc. cit. pi. xlviii. figs. 31, 33, 34. 



Proc, Zool, SOC.--1904, Vol, I. No, XXXI, 31 



