26 ILLINOIS BIOLOGICAL MONOGRAPHS [236 



10. The mucus runs backward along the longitudinal ridges to the pos- 



terior end and is discharged as a waste product in the form of 

 broken threads or strands. 



11. The anterior half of the deutomerite is the region chiefly involved 



in bending movement. 



12. The protomerite is incapable of independent bending movement. 



13. The normal object of contortion is the formation of cysts. 



