Greetings to All,
        Recently, coffee cup in hand, I was admiring some of my shells.  As I
was gazing rather fondly at them I wondered "What compels people to collect
particular shells?"  I thought I would like to convene a virtual summit and
ask the question this way:

           As you have been building your collections have you ever
thought:....What would be your "Canon" or closed list of must have specimens.
 For example, as a collector of Cones (or cowries or whatever), what must you
have to feel you have a "good" or "complete" collection.  Of course it is a
matter of personal taste, but I am curious if there is a consensus among the
collectors in this readership:

      Of the kinds of specimens you collect, what must you have? Or, to put
it another way: Which specimens do you feel should be in every "good"
collection?

                                   Thanks, in advance, for your opinions