Epidermis, the outer coating or scarfskin of the shell.
Equidistant, being at the same distance.
Equilateral, having all sides alike.
Equivalve, having both valves of equal dimensions.
Exolete, worn or faded.
Exserted, standing out, protruding.
Extraneous, not belonging to a particular thing.
F.
Falcated, bent or hooked like a scythe.
Fasciated, filleted, or covered with bands.