Comparison of some interesting molluscs, trawled by the Belgian fishery in the Bay of Biscay, with similar representatives from adjacent waters: part IV, pp. 1-32, plates LXVIII-LXXXXIII, by F. Nolf & J.-P. Kreps.

In the fourth part of the report on the molluscs collected by the Belgian fishery during the previous decade in the Bay of Biscay, a second series of bivalves is briefly described, figured and compared with similar specimens from North Atlantic waters, the Mediterranean Sea or West Africa.

Keywords: Bay of Biscay, W France, Belgian fishery, Mollusca, Bivalvia.