68 ALLEN 
sues a general caudal direction. Close to its origin this vessel 
gives off the right hepatic artery (Pl. I, fig. 11; R.Hep.- 
A.), which supplies the smaller right lobe of the liver. This 
branch runs along by the side of the right portal vein and 
midway between its source and the right lobe of the liver sends 
off the anterior gall-bladder artery (P\.1, fig. 11; A.G.BI.A.)., 
which breaks up on the anterior surface of the gall-bladder, and 
as has already been mentioned under the head of the posterior 
gall-bladder artery, the 2 gall-bladder arteries anastomose on 
the surface of the bladder. A little farther caudad, the anterzor 
intestinal or duodenum artery (fig. 1; A.Int.A.), is given off 
from the intestinal artery to the anterior loop of the intestine. 
The main intestinal trunk then sends off the rather large sflenzc 
artery (Pl. I, figs. 1 and 6; Spl.A.), which penetrates the 
anterior surface of the spleen, together with, but dorsad of the 
splenic vein. Once inside the spleen, it runs entirely through 
the organ, branching out in the shape of a fan. The intestinal 
artery, curving around the dorsal surface of the spleen runs 
along in adipose tissue, parallel with, but closer to the intestine 
than the corresponding intestinal vein. This artery varies 
greatly inlength. Usually, however, it continues to the rectum, 
receiving anastomotic branches from the right posterior gastric 
artery, and curving around to the opposite or dorsal side of the 
intestine, anastomoses with the posterior mesenteric artery (fig. 
1; P.Mes.A.). In several specimens, however, the intestinal 
artery did not continue much farther caudad than the spleen, 
and the posterior part of the intestine usually supplied by this 
vessel received its supply from the right posterior gastric artery 
and the posterior mesenteric artery. As in the stomach and 
ceeca, the larger vessels run in the longitudinal and circular 
muscular coats and break up into a network of capillaries in 
the connective tissue coat. 
(c) Comparisons with Other Genera of the Suborder.—In 
different genera, it is within the viscera where most of the vari- 
ation in the blood vessels occur. This is perhaps in a large 
measure due to the variation in the shape and location of the 
various organs and to the presence or absence of certain of them. 
Of the 3 fishes figured in plate IV, probably the arterial 
