ID please good or bad

[Aquamann88]

Looks like snails without the shell.

 

[Dburr1014]

Chitons probably.
Good

 

[WalkerLovesTheOcean]

Could you take one out and get a better picture of the shell? Could be chitons or limpets.

 

[BristleWormHater]

Look like limpets to me, need better pics though, can you pick one up?