Here are a couple of pictures of comparable fossil forms: http://www.clas.ufl.edu/users/pciesiel/gly3603c/fossils.html http://www.themissinglink.biz/images/Ebay64.jpg The first picture shows pieces of broken mouth plates. The second picture shows mostly pieces of stingray tail spines, but also includes a few mouth plate segments, at top center, and the left edge center and left edge lower. Sorry this is not really mollusk-related, but it does address the question that was presented. Paul M.