A piece of worm-eaten driftwood found at Portballintrae

Cleo - December 04
What is a Teredo worm? because it doesent help me anser my question!

Wilf Upton (July '04)
This wood appears to have suffered the attentions of the Teredo worm, (Bankia Setacea Teredinidae) otherwise known as the Shipworm. A Mollusc rather than a true worm, growing up to 60cm long and 20mm diameter, they will attack the hull of any wooden ship plying the warmer oceans, eating the wood for food. In Nelson's day wooden ships were sheathed with copper sheeting below the waterline to protect them from the Teredo worm, today special paints deter their attack. Any unprotected vessel would be liable to be riddled with wormholes to the point of sinking in a very short time.

I hope this is of help in answering some of your questions

Frank Conley (April '04)
No, can't shed light on creatures, but am anxious to see any responses you get so I will know the answers to the very interesting questions you ask.

SEF:
Similar(?) bore marks/holes can be found in rocks and shells caused by water and/or sand (worn by circular eddies). That doesn't mean the holes in your wood weren't caused by scary worms though.