This is the Family Architectonicidae or the sundials.
Architectonicidae

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Architectonica maxima 2 5/8” or 65.57mm. "Just Lovely"#700453
An F++/NG Architectonica (Maxima-group) maxima 2 5/8” or 65.57mm. Philippi, 1849-Superb Large Caught in Tangle nets at 125-150 meters in...
$15.00 Sale: $12.75
New

Max: 1