Another pecularity is the fact that species that are deep water in one
area are shallow water shells in another (talking about snorkeling at 1
to 20 feet vs diving at 40 to 100 ft.

In Hawaii, at present, almost all Cypraea tigris are in diving depths
(although 60 or 70 years ago 5 inch shells were in snorkeling depths).
In most other Pacific areas they are primarily in shallow water.  This
is the case for a number of species such as Oliva paxillus and Conus
obscurus.  A few species are the reverse of this.

                Merry Christmas and a Happy New Year to all
--
                     Aloha from Wesley M. Thorsson
Editor of Internet Hawaiian Shell News, a monthly Internet Publication
           122 Waialeale St, Honolulu, HI  96825-2020,  U.S.A
       http://www.hits.net/~hsn                 [log in to unmask]