The external shell of a crab is very hard.

The shell height of this shell is 5 centimeters.

He was closely observing the umbo of the shell.

The shell length of this shellfish is 5 centimeters.

The shell diameter of this shell is 5 centimeters.

The skeleton shrimp is clinging to the rocks on the seafloor and living.

This skeleton shrimp is a very rare kind.

The inner shell of this shellfish is very hard.

He was observing the inner shell of the clam.

His attire is sophisticated like Haikara.