it's a whelk sitting on my bookcase . . . I THINK . . . (can't really remember)
It's about 10 inches long

I used to know what kind of shell I was looking at when I went diving almost every day
But it's been a few years and since I can't recall it's name, I'll just call it Lawrence
=)

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ADDENDUM
I had to go back thru my shell books (and some online searching)
I'll have toi change the name . . . this isn't a whelk
It's a Carribean Triton's Trumpet

So much for MY memory