1905.J 



OF THE YELLOW-THKOATED LIZARD. 



259 



The second point concerns the relationship of the two umbilical 

 ligaments to veins entering the liver. A dissection of both 

 specimens of Gerrhosca(,rus shows that the anterior abdominal 

 vein enters the liver in the region of the left umbilical ligament 

 (c in text-figs. 33, 34), and that the epigastric vein is similarly 

 connected with the right umbilical ligament. Precisely the same 

 relationship holds for Macroscincus cocteaui. Inasmuch as the 

 anterior abdominal vein joins the portal vein, the latter might 



Text-fis". 33. 



Text-fig. 34. 



A-nt/^U 



/InlJU 



Text-fig. 33. — Liver of Gerrliosaurtisjiavigularis, ventral aspect. 



a. Attachment of umbilical ligament; h. Seam indicating course of embryonic 

 umbilical vein (?) ; c. Left half of umbilical ligament ; Ant.Ahd. Antei'ior 

 abdominal vein; ISp. Epigastric vein; g.h. Gall-bladder. 



Text-fig. 34. — Liver of a second example of Gerrhosmirus flavigidaris, ventral 

 aspect. Lettering as in text-fig. 33. 



be regarded as fixing this point were it not for the conditions 

 obsei'vable in Macroscincus cocteaui. In that lizard the portal vein, 

 immediately in front of the region where it has, as have the portal 

 veins of other lizards, a spiral twist, divides into two branches, 

 which enter the liver in a line with each part of the divided 

 umbilical ligament. As to the relationship between the divided 



17* 



