cool looking shell

[sjsuperman]

My girlfriend showed me a small shell that her great-grandmother brought over from Sicily over 100 yrs ago. I dont have a pic but i'll do my best to describe it. It's just around the size of a nickel. One side is flat and the other is rounded. What makes this shell show neat-looking is that the rounded side looks exactly like an animals eye; say that of a calf. White with a black pupil. The flat side is brown and white and has a snail-like pattern; the swirl is what I mean. Now she was told by her mom that this was a seashell and I would like to find out for her what it was. Does anyone know of a shell like this?I'll see about getting some pics on here. I appreciate your help. Thx.