IDs?

Looking to have someone ID these for me. The first one looks like a snail of some sort and the second one is some sort of worm I believe. I think I read about it online, but don't recall what it was called. The description did mention a 'forked tail' though.

As for the third one I really don't know what this is. Its been on the rock since I got it and I've noticed its been getting larger and branching out more.

P1040225.jpg


P1040226.jpg


P1040228.jpg
 
2nd pic is a flatworm. They will disappear as fast as they appeared.
3rd pic is a sponge. Good filter feeder.
I can't tell anything with the 1st pic.
 
Well as for the first pic - if it helps at all when I looked at the back of it the creature seemed to have a shell shaped kinda like a cowrie shell, or it was shaped that way.
 
Can't tell about the snail from the bottom. If you can take some pics from the dorsal side, I bet we can get it ID'ed.

Cheers,



Don
 
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