Help ID this worm and his friends

[Ross]

Originally Posted by gobytron

That looks like something very different than a peanut worm to me

Do you have any pics of them with their mouths open?

All I ever manage to catch of these worms is the hole to hole view.
I've seen similar looking ones going from a rock into the sand a few inches away and digging around in the sand for along time, but never seen them extend or retract.
They typcially are retracted in the morning, and come out later in the day.