I tried unsuccessfully to get the BioScapes page open.
Every time I see that nasty looking harpoon, I think it is made of silver.
I guess it is about a half-inch long, and can cause fairly serious human injury.
The snail is also called Ermine's Tail, Agate Cone and (let this roll off your tongue) Hermelinschwanz-Kegelschnecke.
They (at least the shells) are popular with collectors.
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