Sounds like Papustyla pulcherrima, an endangered species from Manus Island
off Papua New Guinea.  Don't worry a lot of people have them and hopefully
most of them date from before they were listed.  Check out Abbott's
Compendium of Land Shells under Camaenidae.  By the way, you gave an
excellent description.
 
Hugs,
 
Kurt
 
 
 
 
At 11:15 PM 11/6/98 +1000, you wrote:
>I have some top shaped lime green shells that have a thin yellow strip on
>the upper edge of the whorls, the shells are shiny with smooth texture, the
>very tip of them is whitish colour the aperture sits flat on the table and
>the shell leans back.  I can't find them in any of my books but I was
>wondering if there are many lime green shells and I have been starting to
>wonder if it may be a land shell.  Any possibilities would be appreciated,
>because it will give me some ideas of names to look up.
>