Branch Annulata 51 



oesophagus, and the latter into the long intestine which 

 extends to the posterior end. Can you see a small gland 

 on each side of the oesophagus ? Where do these glands 

 empty? Do the constrictions of the intestines corre- 

 spond to the divisions of the segments ? Notice the 

 mesentery below the intestines, binding it to the body 

 wall. The mesentery of the upper part was- probably 

 destroyed when the body was cut open. 



IX. — Cut open the pharynx : notice the powerful muscles 

 ajid the two conspicuous black teeth which may be 

 seen on the outside in those specimens in which the 

 pharynx is protruded. 



X. — Trace out as well as you can the blood-vessels and 



the nerve system. 



