'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).
http://i210.photobucket.com/albums/bb188/tmulcrone/PICT0012.jpg
http://i210.photobucket.com/albums/bb188/tmulcrone/PICT0015.jpg
http://i210.photobucket.com/albums/bb188/tmulcrone/PICT0013.jpg

[StephenInVa]

Looks like a stomatella to me.

[Grunt]

Yup

[yousmellsfishy]

Thanks