hni 



~^>nepk. 



e-~ T - 



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; ini, beginning of intestine; ne. co, nerve 

 cord; neph. nephridia; ces, oesophagus; palp, palp; pa?-a, parapodia; perist, 

 peristome; perist. tent, peristomial tentacles; //;, pharynx with its jaws ; Prast, 

 prostomium; vent, vess, ventral vessel. 



192 



