Hitch Hiker id

[blacknife]

There is a little matching crab on there too.. about 1/8th the size of the ?nudibranch. no picture yet.

[Drock169]

I think its actually a snail that covers its body with a mantle kind of like cowries do, I've seen them on Dendroneptheas and just assumed because of the camoflage that they were predators.