Dear all,
I have an interesting question that I hope someone on here can answer.
Yesterday, as I was browsing the net, I came across a photo of
Cancellaria
mercadoi. It was a typical specimen of the species, but in the aperture
was
something not so typical: an operculum. The Compedium says none of the
Cancellariidae
have opercs. Can anyone help relieve me of this confusion? Is it true
that none have percs,
or do some of them do?

Regards,
James