Paul,
 
Okay, how about some families.  Actually when I started to even think this way I
was just going for the families listed in Eisenberg's book.  Later I added
Abbott and Dance's compendium.  So although I have some land and some
freshwater, I was only going for the better known seashell families.  So you are
soooo right, I have no where near 650 families.  In fact, I just went and
counted them.  I have Gastropoda-82, Bivalvia-36, Scaphapoda-1,
Polyplacophora-4, Cephalopoda-4, Landshells (counted separate from
Gastropoda)-21, Freshwater-a couple only.  So I barely missed 650, I'll catch up
next week.
 
Tom Eichhorst in New Mexico, USA  (650?!!!)
 
Paul R. Monfils wrote:
 
> Tom,
> You sure you have a representative of most families?  Kay Vaught lists about
> 650 families in A Classification of the Living Mollusca :-)  Of course, that
> includes all classes of mollusks, marine, fresh water, and terrestrial.
> Paul M.