98 ALLEN 
Shortly before entering the liver, however, the right portal re- 
ceives a vein from a gland-like body, marked G in fig. 1, and 
the anterior gall-bladder vein. The latter vessel (fig. 11, A. 
G.BI1.V.) arises from the anterior part of the bladder, and like 
the corresponding artery, anastomoses with the posterior gall- 
bladder vein. 
In some cases, as was also noted with the corresponding 
artery, intestinal vein,,, does not always have its origin in the 
rectum and anastomose with the posterior mesenteric vein and 
the vessels emptying into the right ceca vein; but sometimes 
arises much further cephalad, and the part of the intestine 
usually drained by this vessel was poured into the posterior 
mesenteric vein and the veins emptying into the right ceca 
vein. 
(6) Left Portal Vein (Pl. I, figs. 1,6 and 11; L.Por.V.). — 
This is somewhat the larger of the two portals. In Ophzodon 
it has its source, principally, from the right and left pyloric 
czeca veins and intestinal vein,,. Of the 2 pyloric ceca veins, 
thev2en7 (Pint igs. x and 6; R.Ca.V.)is the larger.” “Beside 
receiving 3 or 4 large branches coming from the ceca it receives 
a right, and a left posterior gastric vein (Pl. I, figs. 1 and 6; 
R, and L.P.Gas.V.). The right vessel comes from the right 
and ventral side of the posterior or cardiac portion of the 
stomach, where its branches anastomose with those of the right 
gastric vein and branch Z of the posterior mesenteric vein. In 
the specimen from which figures I and 6 were drawn the right 
posterior gastric vein received 2 branches from intestinal vein ,, 
and the right pyloric ceca vein received a third one. In those 
specimens in which these vessels unite with both intestinal 
vein, and the right pyloric ceca vein or its posterior gastric 
branch it would be possible for the blood to flow in either direc- 
tion, but it is probable that the least resistance is toward the 
pyloric czeca vein. Shortly before the right pyloric ceca vein 
unites with the left in front of the pylorus, it receives a small 
vein from the pylorus. Usually the /e/t pyloric ceca vein (see 
Pl. I, figs. 1 and 6), is much the smaller. It receives about 2 
branches from the czca and one or 2 small ones from the 
pylorus. Both of the pyloric ceca veins run outside of their 
