Very thin shell, up to 2 inches wide, with numerous concentric grooves and ridges. Flatter and rougher than the Rayed Trough Shell. Colour is off-white, greyish or yellowish.
Very thin shell, up to 2 inches wide, with numerous concentric grooves and ridges. Flatter and rougher than the Rayed Trough Shell. Colour is off-white, greyish or yellowish.