8 Journal of the Asiatic Society of Bengal. [N.S., XIX, 
2. Tue Dorsat Aorta. 
The Dorsal Aorta throws off a generous supply of 
offshoots to the body-wall and viscera 
Il. There are fourteen pairs of Dorso-lumbar arteries 
arising from the dorsal aorta throughout its course as far as 
its termination in the tail as the een artery. 
II. The Coeliac artery (Fig. 1, coe.) arises beyond the 
origin of the third pair of ebm ete running for 
some distance in the mesentery it divides up in 
(i) The Splenic artery (spl.), for the spleen, 
(ii) The Pancreatic (p.), for the pane 
(iii) The right Gastric (g.), for the ight ‘aide of the stomach. 
(iv) Hepatic artery (h.), for the liver 
It would thus appear that the eS Coeliaco-mesenteric 
of Amphibia is split up in Varanus into three branches, two 
d 
of the branches of the coeliaco-mesenteric takes place, so that 
we find in each of these genera as many as five independent 
visceral branches arising from the dorsal aorta to supply the 
different regions of the alimentary canal. J*urther, in Varanus 
the liver receives its arterial supply from two sources, the 
left epigastric and, as usual, the coeliac. 
The Ischiadic artery (Fig. 2, is.). The last pair of 
segmental arteries are enlarged, and are called by Bronn the 
arteriae ischiadicae. Each arises a little in front of the iliac ; 
each sends a branch to the body-wall, and itself runs forwards 
as the posterior Epigastric (p. e.) to the fat body. in which it 
ears to anastomose with the branches of the anterior 
epigastric. This anastomosis takes place also in Sphenodon, 
the only difference being that the anterior epigastric arises in 
the latter as a branch, not of the common carotid, but of the 
subclavian. 
IV. The Genital and Renal arteries exhibit no peculiarities, 
and always arise in connection with the paired dorso-lumbars 
The genitals are one pair only, the left arising in front of the 
right. The renals are three to five pairs. 
V. The Iliac arteries (Fig. 2, il.) arise beyond the origin 
of the arteriae ischiadicae, and have the usual course 
case the two iliacs arose from the dorsal aorta at different 
levels, the left a little in front of the right, and just at the 
origin of the left iliac arose the left ischiadic. In another case 
the left posterior epigastric arose directly from the left iliac. 
thus indicating the probable fusion of the ischiadic of this 
side with the iliac. The latter condition seems to be similar tu 
what is found in the Urodeles. 
° 
=) 


