448 MR. CG. H. O DONOGHUE ON THE 
4. The Gastro-intestinal Vein. 
4. 1. The Intra-intestinal Vein. 
4, ii. The Anterior Intestinal Vein. 
4. i. The Anterior Lieno-gastric Vein. 
. The Dorsal Anterior Gastric Vein. 
5. i. The Dorsal Gastric Vein. 
5. li. The Dorsal Gisophageal Vein. 
Or 
6. The Ventral Anterior Gastric Vein. 
6. 1. The Ventral Gastric Vein. 
6. ii. The Ventral Gisophageal Vein. 
4 
7. The Hepatic Veins and Sinuses. 
B. The Renal Portal Veins. 
1. The Caudal Vein. 
2. The Renal Portal Vein. 
2. i. The Posterior Oviduecal Veins. 
2.11. The Posterior Parietal Veins. 
THe Hepartc Porran System. 
The hepatic portal system consists of a number of large well- 
marked veins, mostly lying in the gut mesenteries, which convey 
blood from the whole of the alimentary canal (from cesophagus 
to rectal gland inclusive) to the liver. In the higher verte- 
brates all the blood collected from the gut is taken to the 
liver, but in Scyllium there is an exception to this general rule 
in the presence of an intestino-mesenteric vein. There are 
marked differences between the component veins of this system 
in Mustelus antarcticus, according to Parker, and in Seylliwm, 
and in consequence the nomenclature here adopted is descriptive 
and does not necessarily imply homology. The system may be 
conveniently and easily injected from the main trunk near the 
liver. 
A. The Hepatic Portal Vein | Pl. 11., H.P.] is formed in the pan- 
creas, a short distance from its posterior end, by the confluence 
of the posterior intestinal and posterior lieno-gastric veins. It 
runs partially embedded in the right dorsal edge of the pancreas 
to the anterior end of that body, and receives during this part of 
its course a number of small tributaries, the pancreatic veins. 
At the anterior end of the pancreas it is joined by two large 
veins; one, the dorsal anterior gastric, enters it on the right, 
and the other, the gastro-intestinal, enters it somewhat ventrally 
on the left. From this point it runs for a short distance, about 
1:5 cm., in the gastro-hepatic omentum before it receives its last 
large tributary, the ventral anterior gastric vein. It is now an 
extremely large vein with a diameter, when fully distended, of 
