The Saw-tooth Pen Shell
The Saw-tooth Pen Shell, Atrina serrata (G.B. Sowerby 1, 1825), is one of three species of Pen Shells regularly found strewn on our beaches, particularly after winter storms or following environmental disturbances. Its shell is similar to the Stiff Pen Shell, Atrina rigida, but is thinner, showing lighter color. It also differs by the finer, smaller scale-like projections regularly deployed along about 30 radial ribs. This is the most distinctive of the three local species of