The shell can grow fairly large, to more than 25 mm in height.

The brown shell grows to a length of 9 mm.

The shells grow from three to five inches long.

The shell grows to a length of approximately 2.6 mm.

The shell grows to a length of 4mm to 5 mm.

The small, white shell grows to a length of 3 mm.

In the warm parts of the world, the shells grow very large.

The white shell grows to a length of 2.2 mm.

The adult shell grows to a length of 3.5 mm.

This very small shell grows to a height of 1.6 mm.