102 ALLEN 
it anastomoses with branch Z of the posterior mesenteric, and 
the posterior gastric veins. The splenzc vezn (fig. 29, Spl. V.) 
leaves the anterior surface of the spleen, which is located 
directly above the pylorus, and passes forward to unite with 
the right gastric vein in forming the right portal, but immediately 
after leaving the spleen it receives the posterior gastric vein 
(fig. 29, P.Gas.V.), which in Ophzodon emptied into the right 
ceeca vein, a branch of the left portal. The right portal, itself, 
is almost identical with the same vessel in Ophzodon ; it receives 
a small vein from a gland-like body marked G, and shortly 
before entering the right lobe of the liver receives the anterior 
gall-bladder vein which does not anastomose with the posterior 
gall-bladder vein as in Ophzodon. Usually the right portal 
breaks up in the small right lobe of the liver without anasto- 
mosing with terminal branch a of the left portal. 
Beside the ordinary branches which go to make up the right 
portal in Ophzodon, there is an additional one in Sedastodes, 
namely, the anterior air-bladder or atr-bladder retia mirabilia 
vem (Fl IV, fie. 33; A: BI-V.).° This vessel arises irom: the 
retia mirabilia venous capillaries, which are continuous with, 
and run parallel to, the corresponding arterial retia mirabilia 
capillaries. These venous capillaries unite in forming larger 
vessels that terminate in the main anterior air-bladder vein, 
which pierces the ventral wall of the bladder and empties into 
the raght gastric vein. The latter vessel, as in Hexagrammos, 
has its origin.in the posterior end of the stomach without hav- 
ing any posterior mesenteric vein with which to anastomose. 
Shortly after receiving the anterior air-bladder vein the right 
gastric receives the vessel designated as intestinal vein,). This 
vessel (fig. 31, Int.V..,,) arises in the rectum and drains the 
posterior portion of the intestine. In its cephalic course, par- 
allel with the corresponding artery, it follows along the poste- 
rior border of the spleen; in Sebastodes flavidus (fig. 33) it was 
seen to unite with the splenic vein as in Ofhzodon, while in 
Sebastodes auriculatus both vessels emptied separately into the 
right gastric vein. Shortly before joining the right gastric, or 
splenic vein as it is in S. flavédus, intestinal vein,,) usually re- 
ceives a posterior gall-bladder vein (figs. 31 and 33, P.G.BI.V. 
Pp s gs: 3 3 
