BLOOD-VASCULAR SYSTEM OF THE LORICATI 123 
scribed under Ophzodon, or they may arise from the dorsal 
aorta as in Anoplopoma. In the case of Anoplopoma a rather 
large hypobranchial artery is given off, which anastomoses with 
the anterior ventral artery, and the right hypobranchial sends 
off the posterior ventral artery for the ventral fin region. The 
ceeliac artery always supplies the pyloric ceca. With Opfhzo- 
don, Sebastodes, and Anoplopoma it is the source of the left hepa- 
tic artery, and in Ophiodon, Hexagrammos, and Anoplopoma 
it gives off intestinal artery... From the mesenteric artery, in- 
testinal artery,, the splenic and 2 gastric arteries have their 
origin. In Hexagrammos and Scorpenichihys the right gastric 
is the source of the left hepatic artery, and in Sedaséodes it is 
the source of the right spermatic and the anterior air-bladder 
arteries, the left spermatic artery coming from the left gastric 
artery. In Scorpenichthys the entire intestinal supply comes 
from the mesenteric artery. 
Summary of the Verns. —'The jugular and its branches are 
essentially the same in all the species studied, receiving the 
mandibular, hyoidean, maxillary, orbito-nasal, ophthalmic, eye- 
muscle, and encephalic veins. In addition to the main inferior 
jugular and the left fork there are additional veins from the 
pharynx regionin Sedastodes, Scorpenichthys, and Anoplopoma, 
which empty into the precava. Considerable variation is shown 
in the subclavian veins. ‘There is always an external and an 
internal subclavian, and in Scorpenichthys there are several 
internal subclavians. Ordinarily the internal subclavian breaks 
up in the corresponding fork of the kidney, and the external 
subclavian empties into the precava, but in Scorpenichthys the 
external subclavian also breaks up in the kidney, while in 
Anoplopoma the external subclavian appears to penetrate the 
scapula foramen with the corresponding artery, uniting with the 
internal vein to form a common trunk, which breaks up in the 
kidney. Usually there are 2 ventral veins of equal size, but 
in Ophiodon one of them is often much the larger, draining the 
entire ventral fin region. There is always a distinct renal portal 
system. The caudal vein arises in the tail and passing forward 
in the hemal canal below the aorta, receives the neural and 
hzmal veins, and upon entering the kidney, usually, bifurcates 
