Sponge remains have recently been recognised in a number of Eocene glauconitic sandstone pebbles, washed ashore at Cadzand-Bad (province of Zeeland, the Netherlands). These are here briefly described and illustrated. All material is housed in the collections of the Koninklijk Zeeuwsch Genootschap der Wetenschappen (KZGW) at the Zeeuws Museum (Middelburg), under registration number KZGW 341. Additional specimens are in the collections of the Nationaal Natuurhistorisch Museum/Naturalis (Leiden). Lot KZGW 341 comprises four pieces of sandstone with numerous sponges, two of which are here illustrated (Figures 1, 2); another is a single piece of sandstone with numerous sponges. The sponges are circular, disc-shaped to spherical in outline. Most specimens are flattened, but a few are spherical, with diameters of up to c. 15 mm. A circular osculum was observed in a single specimen. Siliceous spicules occur; their size ranges between 0.5 x 0.02 mm and 2.25 x 0.04 mm. Spicule shape is mostly simply needle-shaped, elongate, with tapering ends and a slight central curvature. Only a few spicules show branching at one end, and one has a more complex structure consisting of several broken-off branches.