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These vessels are the nitrogenous excretory organs.
The excretory system is epiblastic in its origin.
The excretory system is highly developed and opens at the posterior extremity by a paired muscular bladder.
The excretory tubes, the nervous system, and the parenchyma and integument are continuous from one end of the worm to the other.
The excretory system consists of peculiar cells, each of which bears several"flames" or bunches of synchronously vibrating cilia.