Here, you can find a Triton trumpet.

Triton trumpet has a large shell and a distinctive red spot.

It is the largest spiral shell found in Japan. Its tentacles have black and yellow stripes.  The shell has a pattern that looks like a wing of a copper pheasant. During the Warring States Period in Japan, it was used to signal the beginning of battle. Japanese are familiar with this trumpet shell. It likes to eat starfish.