Can anyone identify this (these) creature(s)?

[SFKINNC]

The orange thing is about 1/2 inch across with a hole in the center. It grew in that spot and fairly quickly. I have no clue where it came from.

 

[Gareth elliott]

Edit didnt realize how zoomed in you were lol.

Vermatid.

 

[WVNed]

Vermetid snail

 

[SFKINNC]

Thanks for the quick replies. After looking at some information about vermetid snails and learning that they are pests, I scraped it off the rock. Shell is tougher than it looks! Thanks again!