I can help you with one specie, Cassis (Hypocassis) abbotti Bouchet, 1988.
Only three specimens known, all MNHN. Recolected in between New Caledonia
and Queensland.  I think this is actually the most rare specie. If you want
more information about this specie you can write to Dr. Philippe Bouchet to
the Museum of natural history of Paris. I don´t know his e-mail but I think
you can found it in this page: www.mnhn.fr
Best regards
Antonio Agüera García
C/Victoria Mérida y Piret 5 6ºD
C.P.: 29004 Málaga (España)
E-mail:

-----Mensaje original-----
De: James M Cheshire <[log in to unmask]>
Para: [log in to unmask] <[log in to unmask]>
Fecha: sábado 16 de octubre de 1999 19:27
Asunto: extremly rare shells


>Dear all, I need some help. Could someone give me a list
>of 10 VERY rare shells? I mean shells that are so rare that
>only major museums have them. Could anyone help? I'm trying
>to do a documentary on 10 extremely rare shells of the world.
>
>Thanks,
>James