Olsson and Harbison proposed Triplofusus for this and related species (mostly fossil, but including the Panamic princeps). The name is largely overlooked in the literature on extant mollusks, although Keen (1971) notes that Pleuroploca does not fit well.
(I tried sending this message before, but it seems lost. Hopefully this is not a repeat message.)
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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"Mollusks murmured 'Morning!'. And salmon chanted 'Evening!'."-Frank Muir, Oh My Word!