They stepped off the balcony into one of the low tunnels which threaded the black shell around the city.

Though similar in appearance, they tend to have hard black shells and bellies of varied colors.

Individually they had black shells with a line of red.

The insect had a black shell with an intricate red design.

The charred black shell was still on the runway at the end of the day.

This species has a large black and white shell.

But the small black shell was still gripped tightly in the Vulcan's hand.

Further around the clockface, to the south, stood an ebony figure made of crawling black shells.

It possesses a dark brown to black outer shell.

He tore out the black shells and the wires and threw them across the room.