1905. ] OF THE YELLOW-THROATED LIZARD. 259 
The second point concerns the relationship of the two umbilical 
ligaments to veins entering the liver. A dissection of both 
specimens of Gerrhosaurus 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 MJacroscincus cocteaui. Inasmuch as the 
anterior abdominal vein joins the portal vein, the latter might 
Text-fig. 33. Text-fig. 34. 
Ne 
WOE Ata, 
. Text-fig. 33.—Liver of Gerrhosaurus flavigularis, ventral aspect. 
a. Attachment of umbilical ligament; 6. Seam indicating course of embryonic 
umbilical vein (?); ce. Left half of umbilical ligament; Ant. Abd. Anterior 
abdominal vein; Hp. Epigastric vein; g.b. Gall-bladder. 
Text-fic. 34.—Liver of a second example of Gerrhosaurus flavigularis, ventral 
aspect. Lettering as in text-fig. 33. 
be regarded as fixing this point were it not for the conditions 
observable in Macroscincus cocteaui. In that lizard the portal vein, 
immediately in front of the region where it has, as have the portal 
yeins of other lizards, a spiral twist, divides into two branches, 
which enter the liver ina line with each part of the divided 
umbilical ligament. As to the relationship between the divided 
as 
