I do
> remember
> the Compendium as having an error with its illustration of C.
> sennottorum.

By the way, I didn't wish to get on the wrong side of anyone with that
statement.  I could imagine the difficulty of making a text such as the
Compendium of Seashells completely error free.  With such a broad
spectrum of world wide shells and controversies over shells that some
people don't consider to be different species, a high degree of accuracy
is next to impossible.  Those who specialize in one particular group or
location are probably almost always the ones who find possible errors.