158 THE BIOLOGY OF THE ANIMAL 



How does their number compare with that of the 

 abdominal segments ? Does it send any branches 

 to the intestine ? 



Originating at the anterior end of the heart 

 find 



d. The ophthalmic artery. — How does it compare 



in size with c ? Trace it forward over the 

 stomach. Does the artery give off branches ? 

 If so, where do they go? 



Branching out from the heart, one on each side 

 of the ophthalmic artery, find 



e. The antennary arteries. — What course does 



each follow? What is their relation to the ad- 

 ductor muscle of the mandible ? To the stomach 1 

 Do you find the branch (gastric artery) given 

 off by each ? Can you find branches running to 

 the kidney or "green gland," antennse, anten- 

 nules, and rostrum ? Do you find any branches 

 running to the muscles around the stomach ? 



At the ventral side at the anterior end of the 

 heart find 



f. The hepatic arteries. — How many are there ? 



Can you trace their course ? ■ How do they com- 

 pare in size and length with e ? 



Arising at the posterior end of the heart, im- 

 mediately below the superior abdominal artery, 

 find 



g. The sternal artery. — In what direction does it 

 run ? On which side of the intestine does it pass ? 

 ISTotice that it divides into two branches, one of 

 which, the antero-ventral artery, runs forward 

 (its course should not be traced until the organs 



