BLOOD-VASCULAR SYSTEM OF THE LORICATI 97 
cephalad, below the right gastric artery and the right gastric 
ramus of the vagus. Throughout its course it receives numerous 
branches from the muscular coats of the stomach. Leaving 
the anterior part of the stomach it crosses above the corre- 
sponding artery and nerve, and the cceliac artery, and when 
about midway between the stomach and the caudal tip of the 
right lobe of the liver, directly behind a gland-like body marked 
G. it unites with zztestenal vein). This vein (PI. I, figs. 1 and 
6; Int.V.,)) usually arises in the region of the rectum by anas- 
tomosing with branch Y of the posterior mesenteric vein (see 
fig. 1). In its cephalic course in the adipose tissue surrounding 
the intestine, lying below the corresponding artery, it ordinarily 
sends off from one to 3 branches, which empty into the right 
ceca vein or its posterior gastric branch. In the specimen 
from which fig. 1 was drawn 3 such vessels were given off. 
The 2 posterior ones emptied into the right posterior gastric 
vein and the anterior one into the right ceca vein. Through- 
out its entire course intestinal vein,,, receives numerous branches 
from the intestine and when the spleen is reached, which is in 
the neighborhood of the anterior or duodenum portion of the 
intestine, it receives a large vein from that organ. The splenic 
vem (Pl. I, figs. 1 and 6; Spl.V.) arises in the center of the 
spleen from a fan-like system of vessels, which unite in a com- 
mon stem, that leaves the anterior part of the spleen with the 
splenic artery and soon empties into intestinal vein). Im- 
mediately after receiving the splenic vein, intestinal vein), 
usually, sends off or receives a connecting vein (Pl. I, figs. 1 
and 6; C’.V’.), which unites with the anterior intestinal or 
duodenum vein, a branch of the left portal. In another speci- 
men this vein was seen to arise from the splenic instead of the 
intestinal vein. Intestinal vein,,, terminates by uniting with the 
right gastric vein, in the neighborhood of the right lobe of the 
liver, to form the main right portal trunk. As has already 
been atated) this ivessel (BIN) figs.) a and; 11; R.PoraVs)iis 
in itself a very short trunk, which penetrates the apex of the 
right lobe of the liver, and exhausts itself in that gland by 
breaking up into numerous zzterlobular veins (fig. 11, I. Lob. 
V.), which finally terminate in numerous venous capillaries. 
Proc. Wash. Acad. Sci., June, 1905. 
