Hello everyone. I'm new to this shell hobby, so I don't have a clue of what this is, looks like a flat shell, have a look at :
http://good-times.webshots.com/album/563155552dsgWJI

Thanks guys !

This is an operculum, a sort of "door" that a snail uses to seal the aperture of its shell when it draws inside for protection.  Opercula are of two general types - horny ones made of a semi-flexible brown material, and shelly opercula, made of the same material as the shell itself. This is a shelly operculum from a turban (Turbo) shell.  This operculum looks like it might have come from Turbo torquatus. Did you find it in Australia?

http://www.femorale.com.br/shellphotos/detail.asp?species=Turbo+torquatus+Gmelin%2C+1791  

http://bigai.world.coocan.jp/pic_book/data23/r002202.html  

--Last edited by Paul Monfils on 2008-04-21 07:22:04 --

Thanks Paul !  ;)