The magic wheel consists of two sets of lazy tongs, which are connected to form a pair of closed, concentric circles. |
Nearly the entire Unioninae subfamily has smooth surfaces with the exception of ridges formed from the concentric growth rings. |
It shows prominent radial and concentric trabeculae that unite in three dimensions to produce a rectangular or quadrate skeletal framework. |
The fossil tubes have flanges, concentric growth lines and wavy longitudinal ridges. |
The whorl of concentric circles behind them could represent Hollywood or heaven. |
They are large bivalves with thick shells, which bear numerous and finely spaced concentric lines but no radial ones. |