1923.| Uhe Arterial System of Varanus bengalensis (Daud.). 9 
The dorsal aorta, after giving off the iliac arteries, runs 
as the caudal artery (c.) in the tail. The first pair of it 
branches goes to the pelvis, succeeding ones to the muscle of 
the tail. 
I have no observation on the existence of retia mirabilia 
in the caudal region of this lizard, but it is not likely that this 
thick-tailed lizard often parts with that eer of its body. 
I have not met with anv specimen in whic e tail was 
regenerated to a greater extent than its minute ti - 
he chief peculiarities of the arterial system of Varunus 
bengalensis are thus :— 
(1) The origin of the epigastric arteries from the innom- 
inate ; and their anastomosis with the posterior epigastrics, 
as in Sphenodon. 
(2) The origin of a single subclavian of the dorsal type 
from the right systemic only. 
(3) The independent origin of the mesenteric and the left 
gastric arteries from the left systemic arch, as in higher 
siney es before its union with the ‘right. 
The double arterial supply to the liver, by means of 
the et epigastric and coeliac arteries 
The enclosure of both systemic arches by a ligament 
ee is attached behind to the alimentary canal along the 
ramifications of the mesenteric artery. 
3. NOTES ON THE ARTERIAL SYSTEM OF 
Uromastix hardwickii (Gray) and Hemidactylus 
flaviviridis Riippel. 
The arterial system of Uromastix hardwickii (Pig. 4) is 
sta tf present certain remarkable differences from that of 
Vara 
" “Aactil caroticus connects Sant carotid with the sys- 
temic arch of its side. A single subclavian is the only vessel 
which arises from the systemic arches before their union (s., 
Fig. 4). At the point where the coeliaco-mesenteric artery is 
usually given off (between the third and fourth dorso-lumbars) 
arises the gastric artery (g.), which ramifies over the right side 
of the stomach. The next two arteries for the alimentary 
canal arise one behind the other between the seventh and 
eighth sg = anterior of these two, the posterior mesen- 
teric (p. m.), runs backwards to supply the colon and rectum ; 
the other, the peibe (coe.), divides into three branches :— 
(a) The splenic, for the spleen (spl.). 
(b) The gastric, for the left side of the stomach (g.). 
(c) The pancreo-hepatic, which runs along the pancreas 
(pa.), sending branches to this organ as it proceeds, and 
