276 THE BIOLOGY OF MARINE ANIMALS 



pellets are constricted off and these can be eliminated without fouling the 

 mantle cavity. Tubicolous animals have special means of keeping their 

 burrows clean. Lugworms in sand move back to the surface of the tail 

 shaft at regular intervals to defaecate outside the burrow, and sabellids 

 possess a longitudinal ciliated groove which carries the faecal pellets from 

 the anus to the head, where they are shot forth from the mouth of the tube 

 (21, 31,68). 



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