The red shell is the original outer crust going right around - it's roughly circular, as you'd expect.

When spring came we'd see hairy crabs showing their red shells on the sand here and there.

The color patterns include brown or red banded shells, and rarely mostly white shells.

And, in a hollow in the rock, small insects wriggled, their red shells bright.

The vixen looked at the small red shell and shrugged.

How can a little red shell hurt me?

At least until you're pummelled out the sky by an unavoidable red shell, anyway.

Tiny Turtle: She is a blue turtle with a red shell.

The glass doors were splattered with blood, and it had dried to a nice candy red shell.

After extensive and costly research to give itself a new logo, it concluded that the familiar yellow and red shell was best.