Found on a beach in Brisbane, Australia. Only a few cms of it was visible but I dug the rest of it out, it was about 20cm in length.
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That is a Priapulid worm, also known as a "penis worm". In its own phylum, Priapulida. https://en.wikipedia.org/wiki/Priapulida
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$\begingroup$ Thanks, I would never have worked it out as it is quite different looking from the other photos of Priapulid worms available through google search (i.e. I couldn't find an example of a similar looking specimen). Thanks for helping. $\endgroup$ – Sean Oct 31 '18 at 4:55
