This is perhaps a good place to note that the genus for the Florida horse conch (and its Panamic cousin, among others) should be Triplofusus Olsson and Harbison. Keen, 1971 noted that they do not belong in Pleuroploca, but overlooked the Olsson and Harbison genus. L. Campbell 1993 (recently cited on this list for Pliocene identifications) mentions this as well.
Dr. David Campbell
"Old Seashells"
Biology Department
Saint Mary's College of Maryland
18952 E. Fisher Road
St. Mary's City, MD 20686-3001 USA
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"That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks"-P.G. Wodehouse, Romance at Droigate Spa