Nice find! This is a type of Millipede. It might be from Genus Auturus but I am not as good with Millipedes as I am with some other arthropods. Where did you find this little creature?
Here is a link that might help:
http://bugguide.net/node/view/361246/bgpage
Family Euryuridae:
http://bugguide.net/node/view/101508
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