Nemertinea dec. from the FaJklands. 



295 



chitinous tube is surrounded by a spindle-shaped muscular 

 sheath (fig. 3, M.\ continuous with tlie oesophagus behind. 



The oesophagus exhibits a slight spindle-shaped tiiickening 

 near its. junction with the buccal cavity. In its middle 



Fig. 3. 



Dolicholaimus vallentini. Anterior end of female, highly magnified. 



M., muscular sheath of huccal cavity ; Oes., oesophagus ; Ph., " pharynx 

 or tubular portion of buccal cavity ; S., cephalic setae ; T., teeth. 



portion it becomes narrow again, but posteriorly it is greatly 

 thickened. There is, however, no true oesophageal bulb. 

 The nerve-ring crosses the oesophagus at about the middle 

 of the distance from the mouth to its base. No trace of a 



20* 



