Looking for a snail expert

[Need_more_tanks]

So hello everyone, I'm new here and was hoping I could find someone to answer a question for me. I recently bought a couple new snails out of a tank labeled "black racer snails" One of them is obviously a black racer but the other is about the same size but the shell looks like a rock. It is grey and rough just like a rock, but with a snail inside. Google has failed me. Help me fish people, you're my only hope.

 

[Colin_T]

Help me fish people, you're my only hope.

LOL. princess Leia, star wars

can you post a picture of the snails?