Both have round, flat shells and a pronounced metallic flavor.

Inside the mantle in some species is a very small, rather flat shell.

I went over and picked up one of the shells, a pretty white one, flat with yellow around the edges.

It had a flat shell covered with knobbly plates, and a compact skull.

Sometimes these holes are created on the flat shell, other times they are added at the end of the fabrication process.

This may range from zero, a flat planispiral shell, to nearly the diameter of the aperture.

He tried unsuccessfully to skip a flat shell across the water.

The reported model can be summarized as flat shells in turtles are advantageous for swimming and digging.

It grows to up to sixty millimetres long with a broad, flat shell.

Further modification and mineralisation eventually produced two flat protective shells.