What is this snail/conch/whatever?

wartooth1

Member
Hello, while selecting some live rock today at the LFS, I came across this little guy on a rock:

I asked if I could have him if I bought the rock, and that was ok with them so into the tank it went:)
It has a smooth, almost pearl colored shell, a white body, and as you can see, some kind of tube sticking out of it's head. Its about an inch long (maybe slightly longer). Right after taking this pic, it buried itself into the sand completely.
I thought it could ba a nassarius snail, but if it is, I think its abnormally large for one (atleast compared to ones I've seen in random shops)... so if its not that, what could it be?
Thanks!
 
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