26o 



PHYLUM ANNELIDA 



Vascular system.-The blood has a bright red colour and is rich 

 in ha3inoglobin. It flows in a very elaborate system of blood vessels, m 

 regard to the details of which there is still some uncertainty. There is 



-n 



Fig. 140.— Dissection of lob-worm from dorsal surface. 



m. Opening of retracted buccal cavity ; i., gullet ; gl ., diverticula 

 'on^first diaphragm; gl"., oesophageal glands; rf,, ^^lo^^f ^1 ^1°^^ 

 vessels- efh, first efferent branchial; g., stomach intest ne , n^., 

 sixth nephriduun; t>/i3., thirteenth efferent branchial; fl/i|, 

 thirteenth afferent branchial ; a., anus ; «/i ., first afferent branchial , 

 h., heart of left side. 



