Genus Nucinella Wood, 1851

Type species. Pleurodon ovalis Wood, 1840; Neogene, Pliocene; Suffolk, England.

Diagnosis. Nucinellids with external ligament.

Remarks. Of the two genera described for the Nucinellidae, Huxleyia has a mostly internal ligament set in a sunken resilifer, whereas Nucinella has an external ligament. The specimens described herein have an opisthodetic or amphidetic ligament and so are assigned to Nucinella .