72 ALLEN 
gall-bladder artery (Pl. IV, fig. 34; A.G.BI.A.). In case 
such a branch is given off it usually supplies the above men- 
tioned gland (see fig. 34; G.) The third branch of the right 
gastric is the azr-bladder retia mirabilia or anterior atr-bladder 
artery (Pl. IV, fig. 31; A.BI.A.); it crosses above intestinal 
artery,,, and the right anterior spermatic vessels, just in front of 
the right mesenteric and the anterior air-bladder veins. Pene- 
trating the thick ventral muscular walls of the air-bladder it 
breaks up internally into small branches, which in turn break - 
up into minute parallel arterial capillaries, that become contin- 
uous distad with parallel venous capillaries, and which are 
afterward collected into small veins that empty into the air- 
bladder retia mirabilia vein. This sort of a horseshoe-shaped 
mass of capillaries on the floor of the air-bladder is known as 
the retia mirabilia or vaso-ganglion of the air-bladder; it is a 
vaso-ganglion of the bipolar type. This broad expanse of 
capillaries affords a good opportunity for the exchange of gases 
from the blood to the bladder and conversely. ‘The fourth and 
last branch to be given off from the right gastric artery is the 
left anterior spermatic artery (Pl. IV, fig. 31; L.Sper.A.). 
This vessel pursues a similar course to the right anterior sper- 
matic artery, following parallel with the corresponding vein it 
helps supply the left ovary or testis and anastomoses poste- 
riorly with the spermatic artery proper. /ntestinal artery,,, (Pl. 
IV, fig. 31; Int.A.,) pursues a general caudal course, passing 
under or rather to the right of all the above mentioned arteries. 
When in the neighborhood of the spleen it divides; the pos- 
terior fork, which is designated as the continuation of the main 
intestinal artery,,,, passes caudad to supply the posterior end of 
the intestine; while the anterior fork soon divides into the 
splenic artery and what I have designated as intestinal artery,,). 
Intestinal artery, (Pl. IV, fig. 31; Int.A.,) is so named be- 
cause it runs parallel with a vein, which has the same terminus 
as intestinal vein ,,) of Ophzodon, but it is hardly probable that 
this artery is homologous with intestinal artery,,, of Ophzodon. 
This artery separates into an anterior branch, which supplies 
the anterior part of the intestine or duodenum and a posterior 
branch, which supplies the iliac part of the intestine. In some 
