Can Anyone Identify this Snail?

[pfritzbelly]

And is it detrimental to any on the corraline algaes growing in my tank?

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Any help is greatly appreciated. Two of them just kind of "appeared" recently.

 

[glxtrix]

looks like a type of stomatella:

 

[pfritzbelly]

You know your molluscs! I plugged your ID into Google and came up with this:

http://reefkeeping.com/issues/2004-05/rs/index.php">http://reefkeeping.com/issues/2004-05/rs/index.php</a>

You hit it right on the head.

Thanks!