Notes on some Nuculacea and Arcacea from the Neogene and Lower Pleistocene of the Netherlands

The following notes result from the study of specimens from well borings earlier recorded by HEERING and of material from shell beds in the bottom of the Westerschelde worked by a sand-dredger for lime factories. The stratigraphic horizon from which the latter fossils have been derived is uncertain. Hitherto Eocene (Lutetian), Oligocene (Rupelian), Upper Miocene to Lower Pleistocene (Anversian-Icenian), Upper Pleistocene (Eemian) and Recent species have been found in this material. The bulk of the fossil species, however, come from the Anversian to Icenian. In the synonymies an asterisk indicates what I consider the valid name of the species.