Bunch of weird stuff that I found today. Urchin and some other stuff...?

[cableguy]

Pics #1 and 4 are a urchin that I saw for the first time today.
#2 and 3 is some weird thing in the rock. Pretty cool looking. It does move if I come near it.
#5 has like 6 "arms" that it pulls into its center slowly and then releases it arm back out, and then it is on to the next arm that it will pull in and then back out, over and over... Its white and very thin.

 

[cableguy]

Another urchin?

 

[cranberry]

#2 and #3... tunicate.

 

[speg]

The urchin looks like a small long-spined urchin. Where is the liverock from?
The last pic looks like a filter-feeding sea cucumber.

 

[cableguy]

Florida

 

[speg]

That's what I thought