pretest &JF pgjt, ^p~ 



Fig. 109. — Nereis dumerilii. Semi-diagrammatic view of the anterior portion of 

 the body, with the dorsal body-wall removed, so as to show the alimentary canal, 

 the septa, the blood-vessels and the nephridia: a portion of the intestine removed 

 so as to show the ventral blood-vessel and nerve-cord which lie below, dors, vess, 

 dorsal vessel; gl, oesophageal glands; hit, beginning of intestine; ne co, nerve 

 cord; neph, nephridia; ces, oesophagus; palp, palp; para, parapodia; perist, 

 peristome; perist. tent, peristomial tentacles; ph, pharynx with its jaws; prcest^ 

 prostomium; vent, vess, ventral vessel 



192 



