WHORLTay Glasshouse · Dundee
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Shells D Distance 05 of 12

Precious
wentletrap

Epitonium scalare

The whorls never touch. Only the ribs hold the shell together.

W widening
2
D distance
0.22
T travel
2.65
S shape
round
turns
6.2

The settings our model uses to draw it, tuned by eye against photographs.

Drag to turn
A white precious wentletrap on a rock, its loose whorls held by thick ribs.
Photograph: Steve Jurvetson, CC BY 2.0, Wikimedia Commons

The real shell · 25–72 mm

In the 17th and 18th centuries it was thought very rare and sold for large sums.

Cosimo III de' Medici owned one.

Lives
Red Sea and Indian Ocean to Fiji and Japan
In the exhibition
Room 2, Four numbers: one of three shells for D, how far from the axis.