CIRCULATORY SYSTEM OF ELASMOBRANCHS. 451 
between the intestine and the stomach, where it branches off 
to the anterior lobe of the pancreas. 
5. The Dorsal Anterior Gastric Vein | Pl. I1., D.A.G.] is formed 
by the union of the dorsal gastric and dorsal csophageal veins, 
and runs in the mesentery from the dorsal anterior side of the 
stomach into the hepatic-portal vein just as the latter is leaving 
the front dorsal end of the pancreas. 
Diamare (2) describes and figures a fairly large anastomosis 
between the dorsal anterior gastric vein (vena gastrica dorsalis 
anterior) and the median gastric vein (vena gastrica media) in 
Seyllium catulus. I have examined eight specially injected speci- 
mens of S. canicula and numerous fresh ones, but have been 
unable to find this anastomosis. A large branch runs forwards 
to join the dorsal anterior gastric vein, and a smaller one 
originating near it runs backwards into the median gastric vein 
(vide fig. 1, Pl. I1., P), but the two do not anastomose by any 
well-marked vessel such as Diamare figures, although they are 
indirectly in communication by means of capillaries. 
5.1. Lhe Dorsal Gastric Vein [Pl. I1., D.G.j is a well-marked 
vein composed of two main tributaries, which collect the blood 
from the right and left sides of the anterior two-thirds of the 
cardiac division of the stomach. 
5.11. Lhe Dorsal Gsophageal Vein [ Pl. I1., D.O.] brings back 
blood from the dorsal side of the cesophagus. 
6. The Ventral Anterior Gastric Vein [ Pl. II., V.A.G.] is a large 
trunk receiving one branch from the stomach, the ventral gastric 
vein, and one branch from the cesophagus, the ventral cesophageal 
vein. It leaves the stomach-wall on its ventral side, anterior to 
the point of departure of the dorsal anterior gastric vein, and it 
runs in the mesentery to flow into the hepatic-portal vein shortly 
before the latter divides into its right and left branches. 
6.1. The Ventral Gastric Vein (Pl. II., V.G.] is a conspicuous 
vessel formed by the confluence of a number of tributaries from 
the ventral side of the anterior two-thirds of the cardiac division 
of the stomach. 
6.11. The Ventral Wsophageal Vein [ Pl. I1., V.O.] collects the 
blood from the ventral side of the cesophagus. 
The esophagus has a very rich plexus of large capillaries 
similar to that described by Parker (10) in M/ustelus, save that in 
Mustelus the blood from this plexus is taken to the posterior 
cardinal sinuses, while in Seylliwm it goes to the hepatic-portal 
vein in the manner described above. 
7. The Hepatic Veins and Sinuses (Pls. I. & II., H.S.]. The 
hepatic vein is a large thin-walled venous trunk situated at the 
anterior end of the corresponding lobe of the liver. The two 
hepatic veins unite just outside the liver to form a large sac, 
the hepatic sinus, which, when dilated, entirely fills up the space 
between the ventral body-wall, the cesophagus, the anterior ends 
of the lobes of the liver, and the pericardio-peritoneal septum. 
Proc. Zoou. Soc.—1914, No. XXX. 30 
