'nuther ID please

[yousmellsfishy]

This is a sort of snail, I believe with a shell that looks like a half oyster shell. He's fast too (relatively speaking, It is a snail after all).

 

[StephenInVa]

Looks like a stomatella to me.

 

[Grunt]

Yup

 

[yousmellsfishy]

Thanks