404 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



portion, the Ovarian (or. a.) [or Spermatic] artery, which 

 follows the course of the gonads, and (2) an anterior 

 portion, the Antennary artery (a. art.), which passes 

 around the front of the fore-gut and supplies the organs 

 in the region of the head. 



The main portion of the lateral artery, after leaving 

 the heart, dips down gradually until it reaches the 

 external abductor muscle of the mandible (e. a. md.). The 

 antennary artery still continues to pursue a deeper course, 

 but the ovarian [or spermatic] artery becomes more super- 

 ficial. When the gonads are well developed the main 

 artery and the gonadial branch are partly embedded in 

 the substance of the gonad, but when the reproductive 

 organs are small these parts of the artery are quite 

 superficial. 



Branches of Main Lateral artery — 



Branch to the Hind- gut. This arises on the inner 

 side of the artery just behind the internal adductor 

 muscle of the mandible. It passes downward and inward 

 to that portion of the hind- gut beneath the front part of 

 the heart. 



Branch to the Digestive Gland. This is a large branch 

 arising immediately in front of the branch to the hind- 

 gut. It passes outward and gives off numerous branches 

 to the digestive gland and also to the hypodermis in this 

 region. 



Branch to the Cardiac Fore- gut. In front of the 

 internal adductor muscle of the mandible a large branch 

 is given off on the inner side. It passes through the 

 substance of the gonad and breaks up into a complicated 

 network on the lateral and dorsal walls of the cardiac 

 fore-gut. This branch supplies the muscles of the 

 fore-gut. 



Branches to the Hypodermis. Throughout the whole 



