Thanks, David Campbell. I have a copy of the publication and will read more
about Lister at leisure.

You also wrote,
"Lister's figure of Chesapecten jeffersonius also shows resting scars
similar to those attributed to hipponicid gastropods.  I'm not sure if that
counts as an additional molluscan fossil figure."

Well, it's certainly worth a mention in molluscan contexts for paleoecologic
reasons, but taxonomically, a resting scar is a trace fossil (ichnofossil)
and may be assigned ichnogeneric and ichnospecific names. I am not aware of
any formal name for hipponicid scars, but it seems likely that one will
appear in a Campbell publication any day now, no doubt with prior
consultation with bioerosion specialist Richard Bromley (University of
Copenhagen). I don't know whether this would be the first North American
trace fossil to be figured. It might well be. I will pass this intriguing
possibility on to the Skolithos (ichnologists') listserver for comments.

Andrew K. Rindsberg
Geological Survey of Alabama