104 ALLEN 
the pyloric branch of the left one extends backward on the car- 
diac portion of the stomach as a sort of posterior gastric vein, and 
anastomoses with branches of the posterior mesenteric vein; 
while the posterior gastric vein proper empties into the splenic 
vein instead of the right ceca vein as in Ophiodon. Intestinal 
vein, (fig. 29, Int.V.,)) arises from the posterior end of the 
iliac loop; the most dorsal of its branches anastomoses with 
branch Z of the posterior mesenteric vein, and it receives a 
branch coming from the region of the rectum. In its cephalic 
course, intestinal vein, passes between the two arms of the 
ileum, and receives a branch from the posterior part of the in- 
testine designated as znéestznal vein, (fig. 29, Int.V..)), and the 
anterior intestinal or duodenum vein (fig. 29, A.Int.V.). The 
combined intestinal trunk thus formed passes under the anterior 
arm of the duodenum and joins the left portal close to its origin 
from the 2 pyloric ceca veins, but before emptying into the 
left portal it receives or sends off a connecting vern (fig. 29, 
C’.V’.) that unites with the splenic vein. After reaching the 
great left lobe of the liver the left portal immediately gives off 
to each side numerous terminal branches or radicals, which 
break up into the interlobular veins. As in Ophzodon, except 
in a very few cases, radical a of left portal does not anastomose 
with the right portal; it, however, receives the posterior gall- 
bladder vein (fig. 30. P.G.BI.V.), and also a very large ventral 
gastric vein (fig. 30, V.Gas.V.), which anastomoses anteriorly 
with the left gastric vein and posteriorly with a branch of the 
posterior mesenteric vein. 
As in Ophiodon there is a left gastric vein (fig. 30, L.Gas.- 
V.) emptying directly into the precava and two smaller left 
gastric veins; one of which empties into the precava and the 
other into the left fork of the kidney ; while the main left gastric 
vein anastomoses with branches of the ventral gastric vein, 
which has branches that anastomose with branches of the pos- 
terior mesenteric vein. 
The left portal in. Sebastodes (P1. IV, figs. 30 and 31; L.- 
Por.V.) is a rather insignificant vessel, having its source from 
a vessel designated as intestinal vein, and the right pyloric 
cfeca vein. Intestinal vein, (fig. 31, Int.V....) returns the 
