116 ALLEN 
The outer subclavian vein penetrated the scapula with the cor- 
responding artery and joined the internal subclavian vein in 
forming the common subclavian trunk, which terminates in its 
respective horn of the kidney. 
The vessel designated as the anterdor ventral artery (fig. 36; 
Ven.A.) arises from the ventral union of the second right and 
left efferent branchial arteries; principally, however, from the 
second left efferent branchial artery. After passing over the 
combined trunk of the third and fourth afferent branchial ves- 
sels it gives off the pharynx artery. This vessel (fig. 36; 
Phar.A.) supplies the pharynx region, and soon sends off the 
coronary artery (fig. 36; Cor.A), which passes along the dorsal 
side of the ventral aorta to the heart. In all other genera studied 
the pharynx artery arose directly from the second or the third 
efferent branchial arteries. The anterior ventral artery evi- 
dently corresponds to the ventral artery of the other species ; 
except that it extends only to the origin of the pelvic arch. In 
addition to giving off the pharynx artery it sends off branches 
to the sterno-hyoideus muscle and anastomoses with the 2 hypo- 
branchial arteries. It would be possible, however, in Azoplo- 
poma for blood in the anterior ventral artery to reach the ventral 
fins by passing through the right hypobranchial artery into the 
posterior ventral artery. By the separation of the right hypo- 
branchial from the subclavian we would have in the anterior 
ventral, right hypobranchial, and posterior ventral arteries an 
irregular shaped vessel corresponding somewhat to the ventral 
artery of the other genera. 
As in Sebastodes, there is in addition to the main inferior jugu- 
lar and left branch, a right inferior jugular, which drains the 
ventral branchial muscles from the right side and empties into 
the right precava. 
Caliaco-mesenteric Artery. — This trunk (fig. 37; Coe.Mes.- 
A.) upon reaching the cesophagus separates into the cceliac and 
mesenteric arteries respectively. The mesenterzc artery soon 
divides into intestinal artery,,, and a short stem from which the 
right and left gastric arterzes have their source. The latter 
vessel (figs. 37 and 38; L.Gas.A.) makes a cephalic curve 
across the cesophagus and continues on the left side of the 
