92 ALLEN 
between the ventral aorta and the transversus ventralis muscle, 
and when the posterior edge of this muscle is reached, which 
is about midway between the last pair of afferent branchial 
arteries and the ventricle, the inferior jugular bifurcates into a 
very large 7zgh¢ and a much smaller /eft inferior jugular vein 
(PiU, ie. 125 and Pal joys). abe, course ofeach ofthese 
veins is then obliquely caudad, running along the ventral side 
of the pharynx close to the pharyngo-clavicularis internus mus- 
cle. They terminate by emptying into their respective pre- 
caval veins. Throughout their course they receive branches 
from the pharynx, the phayngo-clavicularis internus and ex- 
ternus muscles, and shortly before dividing, the inferior jugular 
received branches from the pharyngo-hyoideus and transversus 
ventralis muscles, and the coronary vein. 
The coronary vem (Pll, fig. 12; Cor.V.) arises froma 
dorsal and a ventral branch, which run parallel with their 
respective arteries. The dorsal vessel collects the venous blood 
from the anterior part of the ventricle and the bulbus arteri- 
osus; while the ventral branch drains only the bulbus. About 
midway between the ventricle and the first pair of afferent 
branchial arteries these 2 branches unite on the left side of the 
ventral aorta in forming the main coronary vein, which finally 
empties into the inferior jugular shortly after it emerges from 
the last pair of afferent branchial arteries. 
Beside this coronary vein, which drains the ventral aorta, 
bulbus, and anterior part of the ventricle there is another sys- 
tem of coronary veins, which terminate by emptying directly 
into the auricle. The outer layer of the ventricle is a mass of 
capillaries, which become collected on the ventral side into 4 
or 5 veins that pass around to the dorsal side where some of 
them anastomose, forming 2 or 3 vessels, which penetrate the 
auricle close to the auriculo-ventricular valve. In one speci- 
men several small veins were noticed to arise on, and penetrate 
the dorsal surface of the auricle. 
In Sebastodes melanops, beside the large right and the smaller 
left inferior jugular veins, 2 other veins, laterad to these, were 
observed. They arose from the pharyngo-clavicularis internus 
and externus muscles, and passed caudad to empty into their 
respective precaval veins. 
