Cool sea cumcumber at KingEd's?

[bulletsworld]

Hey anyone seen this thing. I thought it was the coolest looking creature.

Its yellow color, long and has tenicles almost like featheres on the end for a mouth. They call it a long cucumber but they couldn't tell me anything about it, what it eats or if its like a sea apple (not worth getting)

Anyone seen and know? They call it a "long cucumber"?