Dear Avril,
This is almost certainly Perotrochus hirasei. Compare the following from my
web site (hape proportions, nodules, lip length and directions of banding).
My specimen is a bit darker
<http://nighthawk.tricity.wsu.edu/museum/ArcherdShellCollection/Gastropoda/P
leurotomariidae.html>
Regards,
Burt Vaughan
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