2 Journal of the Asiatic Society of Bengal. [N.S., XIX, 
tried the plan of causing engorgement of some portions of 
the arterial system by ligaturing other outlets from the heart 
while the heart was still beating ; in this way the course 
of the vessels could easily be followed. Dissections of fresh 
specimens of Uromastix and Hemidactylus flaviviridis were also 
made for comparison, and I have added brief notes on these 
also. My grateful acknowledgments are due to my professor, 
Colonel J. Stephenson, D.Sc., now at the University of 
Edinburgh, for his kind secetins and also for correcting 
the manuscript of my paper 
1. Tue ArteRtat ArcHeEs. (Fig. 1.) 
There are three arterial trunks arising from the ventricle. 
The cavity of the latter is incompletely divided by a ridge-like 
partition, which runs obliquely from the left latero-ventral 
wall. and tends to divide the ventricle at the time of its 
contraction into two unequal —— of these the right 
is the larger, and more dorsal in posi 
Arising from the left side of ‘he pains is the Pulmonary 
arch, ventral in position and curving over to divide into two 
—— the pulmonary arteries, one for each lung. 
right chamber gives origin to two vessels, the right 
and left roots of the aorta. These roots, the systemic arches, 
cross each other at their origin, so that the left systemic arch 
arises from the heart on the right side of the right arch. 
Both these arches arise dorsally to the pulmonary arch and 
twist round to become ventral to it; they then curve round 
the oesophagus, thus becoming dorsal in position, and finally 
run backwards to unite with each other below the vertebral 
column and behind the level of the heart. 
The Right Systemic, or better the Se 
arch. Before this arch curves round to occ — e dorsal 
position it sends off a branch, the Innominate (c. 
(A) The Innominate artery (carotis assuesa ‘of Rathke) 
immediately after its origin gives off a narrow branch, the 
mon epigastric (ep. -c.); which runs backwards just 
runs forwards towards the head, and about half an inch in 
front of the bifurcation of the trachea divides into the 
right and left carotid arteries, each of which follows its usual 
course forwards along the nec 
The Common Epigastric artery, the origin of which is 
danke above, divides into two near the base of the auricles: 
these, the right and left Epigastric arteries, are very fine 
— and in order to see their exact course I had to use 
) an 
innominate also was ligatured near the butuees thee of the 

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