Up for auction are two natural sea shells. The shell on the left is identified as a Spotted Tun (Tonna dolium or Tonna tessellata)  It is a large, thin-walled sea snail shell with a broad, rounded body and prominent spiral ribs. It typically features distinct brown spots along these ribs.

The shell on the right is consistent with a Noble Volute (Cymbiola nobilis) This shell is more elongated and heavier than the tun shell. It is known for its polished surface and intricate zig-zag or banded brown patterns over a cream or tan background.

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