BLOOD-VESSELS OF MUSTELUS ANTARCTICUS. 
G99 
Tlie large and important coeliaco-mesenteric artery (Plate 34, fig. 1 ; Plate 35, figs. 6, 
7, and 10 ; Plate 36, fig. 12, Cost. Ales. A.) arises from the dorsal aorta immediately 
caudad of the junction with the latter of the fourth pair of epibranchial arteries. It 
is about 3 cm. long in the adult, dividing into sub-equal coeliac and mesenteric 
arteries. 
The coeliac artery. 
“ An artery like to our coeliac,” Monro (16). 
Arteria coeliaca , Hyrtl (11). 
The anterior of the two divisions of the coeliaco-mesenteric artery (Plate 35, fig. 7 ; 
Plate 36, fig. 12, Ccel. A.) passes backwards along the inner or right side of the 
cardiac division of the stomach. It first gives off the anterior gastric artery (Ant. 
gast. A.) which supplies the proximal third of the dorsal wall of the cardiac 
division of the stomach ; then a comparatively small right hepatic artery (R. liep. A.) 
to the right lobe of the liver ; then a vessel which divides almost immediately into 
the left hepatic artery (L. hep. A.) supplying the left lobe of the liver, and the 
small pyloric artery (Pyl. A.) going to the distal end of the pyloric division of the 
stomach. The coeliac then becomes the main or ventral gastric artery (Vent. gast. A.), 
which branches out in the fold of mesentery between the cardiac and pyloric divisions 
of the stomach, sending numerous branches to both. Of these the branches to the 
cardiac division are distributed exclusively to its ventral wall. 
The anterior mesenteric artery. 
“An artery resembling our superior mesenteric artery,” Monro (16). 
Arteria mesenterica anterior, Hyrtl (11). 
This, the posterior division of the coeliaco-mesenteric artery (Plate 35, fig. 7 ; Plate 
36, fig. 12, Ant. Mes. A.), passes backwards alongside the portal vein (fig. 12, Hep. 
port. V.) and divides, immediately cephalad of the pylorus, into a ventral branch, 
the ventral intestinal artery, and a dorsal branch, the intra-intestinal artery. 
As far as its origin is concerned, this vessel clearly answers to the anterior 
mesenteric artery of the skate, but the further course of the latter vessel rather 
corresponds with that of the dorsal intestinal artery of Mustelus (vide infra, p. 700). 
The ventral intestinal artery. 
Duodenal artery (in Scymnus and Raja), Parker (20, 22, and 23). 
This trunk evidently corresponds, as far as its general relations are concerned, with 
that I have called duodenal in the skate and in Scymnus, since it lies ventrad of the 
duodenum or bursa entiana, supplying that part of the intestine. As, however, it 
originates in Mustelus from the anterior mesenteric artery instead of from the 
4 u 2 
