Cool find Mary! This is a larva of some sort of insect! It most reminds me of a Longhorned Beetle larva. The larvae of these beetles feed within dead and dying wood mostly. I am not even going to attempt at an ID on this though it's possible that someone else might know. Many larvae are hard to distinguish from one another.
Here are some images of other Longhorned Beetle larvae:
http://bugguide.net/node/view/162214
This should be moved to the Arthropods section.
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