118 ALLEN 
ceeliac, intestinal artery.) is given off to the right (fig. 37; 
Int.A.(.)); passing caudad to the right of the corresponding 
vein it crosses under the ventral branches of intestinal vessels,,), 
the spleen, and the dorsal branches of intestinal vessels, and 
continuing caudad between the anterior and posterior horns of 
the iliac loop, supplies both of them. The cceliac artery proper 
separates into the réght and left pyloric ceca arteries. The 
former (fig. 37; R.Ca.A.) passes around the pylorus on pyloric 
cecum,,), and bifurcates into a dorsal and a ventral branch; 
the ventral branch gives off a large branch which crosses under 
this cecum, and continues caudad between caecum, and 
cecum), giving off branches to each. The left pyloric ceca 
artery (fig. 37; L.Cz.A.) passes to the left of the pylorus be- 
tween cecum, and czecum,), giving off branches to each. 
Portal System.— As in Sebastodes the 2 portals unite in 
forming a common portal, that breaks up into numerous 
radicals. 
The right portal (fig. 37; R.Por.V.) has its origin from the 
right gastric, and intestinal vein,,. Jntestznal vein, (fig. 373 
Int.V.,,)) arises from a dorsal anda ventral branch. The former 
(fig. 37; Int.V..,,)) arises from the dorsal side of the rectum, 
and runs cephalad, parallel to the corresponding artery, but 
below it; receiving branches from the posterior end of the 
intestine and anterior horn of the iliac loop, it crosses intestinal 
vessels, and passes above and to the right of the spleen from 
which it receives the splenzc vein (fig. 37; Spl.V.). Directly 
in front of the spleen the dorsal intestinal vein receives the 
ventral intestinal branch (fig. 37; Int.V.,,,.), which arises from 
the lower side of the rectum and passes forward along the ven- 
tral side of the corresponding artery. Curving around the ven- 
tral and left side of the spleen it receives two branches; the first 
one, which is the posterzor gastric vein (fig. 37; P.Gas.V.) 
arises from the cardiac end of the stomach, and runs along in 
front of the posterior gastric artery; while the anterior vessel 
has its source from two branches, one coming from between 
pyloric cxcay), gq, and the other from-icecum).\jeaater 
receiving these branches the ventral intestinal branch crosses 
over intestinal vessels,,., and in front of the spleen unites with 
