Dear Leslie et al;-
      I shouldn't have used the word "only" ,   and I remember his name as being Norm Paschal.  Maybe one reason for rarity (not mentioned as yet) might be evolution. A species may be being replaced by an "upgrade". The older form might then become Rare.
      Art


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---- Leslie Allen <[log in to unmask]> wrote:
> The concept ...
> "Rare shells are rare only because their habitat is relatively unknown."
> .. is a bit of a misnomer touted as a part of a certain Malacologists generic
> hoopla.  It is blanket statement that covers many but not all species.
>
> As with all animals, some are prolific breeders, and others are not.  Whereby
> for may species there will never be a proverbial “mother load” or commonness,
> this leading to “rarity” in there actual occurrence and - or in trying to find
> them.
>
> Leslie
>
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