This item is 30% OFF Family: Architectonicidae. You wont be able to tell time from these shells, but this shell is a treasure in any collection. This small family features a rather flattened shell with either beaded or smooth surfaces. The bottom of the shell is concave and resembles a staircase. The top of the shell has a pattern that resembles a pinwheel. The overall design is one of the most intricate in the shell world.