Snail ID?

[Dolphin2409]

Hi

Any idea what this is?

It’s in the sandbed and is about the size of a finger nail. I have seen them on the glass also

 

[56longroof]

Stomatella

 

[Dolphin2409]

Thanks very much. I appreciate it

 

[Dolphin2409]

I knew I had black stomatellas. Took this video today of one spawning.

 

[kevgib67]

Looks to me to be a chiton.

 

[EricR]

Pictures of the top/back shell?
From bottom, I would guess chiton also.
*maybe limpet but looks too elongated