Ahhh! If they used to be long before they were grazed on, then Enteromorpha definitely is a strong possibility (though anything from that genus is now classed as Ulva).
I have seen the other beaches and usually elongated and flat, sometimes much longer than a finger, 20 to 30 cm, but may not be the same! tomorrow will look in a book of autochthonous flora and tell you something!
This is tough to ID because I think there has been extensive grazing on this, and then you mentioned the crabs feeding on it, so that is probably the case! But my thinking is something in the genus Blidingia (http://www.marlin.ac.uk/speciesinformation.php?speciesID=2777) or Prasiola (http://www.marlin.ac.uk/speciesinformation.php?speciesID=4199), or something like that, which has been eaten up quite a bit. I'll have a better think about it tomorrow when I have slept :D
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