260 THE DOG-FISH. 



into two main branches, one of which 

 supplies the proximal end of the stomach 

 and the liver, and the other the first part of 

 the intestine and the pancreas. 



iii. The anterior mesenteric artery is a median 

 vessel arising from the aorta about an inch 

 and a half behind the coeliac artery. It 

 supplies the intestine and rectum, and gives 

 branches to the genital organs. 



iv. The lieno-gastric artery is a median vessel 

 arising from the aorta immediately behind 

 the mesenteric artery. It supplies the loop 

 of the stomach between its proximal and 

 distal limbs, and also the spleen and part of 

 the pancreas. 



v. The posterior mesenteric artery is a small median 

 vessel arising from the aorta about an inch 

 and a half behind the lieno-gastric, and run- 

 ning backwards in the mesentery to the 

 rectal gland, which it supplies. 



vi. The parietal arteries are small paired vessels 

 arising at intervals along the whole length 

 of the aorta, and supplying the body-walls. 



vii. The renal arteries are small paired vessels 

 arising from the parietal arteries, and sup- 

 plying the kidneys, which they enter from 

 the dorsal surface. 



The dissection of the renal arteries should be postponed 

 until after the dissection of the reproductive organs and cloaca. 



To see the arteries, dissect one kidney away from the body- 

 wall and turn it inwards, so as to expose its dorsal surface. 



viii. The iliac arteries are a pair of small vessels 

 leaving the aorta near the hinder end of the 

 body-cavity, and running outwards in the 

 body-walls to the pelvic fins, which they 

 supply. 



