lingulidæ

from The Century Dictionary.

• A family of lyopomatous brachiopods, with an elongate peduncle passing out between the valves or through a narrow channel in the hinge-margin, the brachial appendages fleshy and forming separate coils directed upward, the valves oblong or subcircular, and the shell horny. About 15 genera are referred to the family, all but two of which (Lingula and Glottidia) are extinct. See Lingula, 2 .