Dear Andrew,
I think with those characteristics for Crosseana, you must be on to something. There are two widely disparate internet images for Crosseana when I googled. One of them is in an online reproduction of a New Zealand journal article and has some resemblance. Do you know of any other illustrations for that genus?
The Conradia perclathrata images on http://microseashell.com/seashell/main/default.htm don't have good depth of field but don't appear to have a thickened outer lip. I confess I don't know if the placement of that taxon in Fossaridae is correct.
David
"Everyone has a heart. Except some people."--Bette Davis
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