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Found on beach in Atlantic Canada in November.

"Sack" is approx. 2" (approx. 5cm) in length.

enter image description here

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    $\begingroup$ any opening, or shell? looks like a n innkeeper worm. $\endgroup$ – John Nov 24 '17 at 4:11
  • $\begingroup$ Just a guess: en.wikipedia.org/wiki/Sipuncula $\endgroup$ – bli Nov 27 '17 at 10:10

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