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This paper deals with the complex behaviour ofHomarus gammarus attacking the pelecypodMytilus edulis and the gastropodBuccinum undatum; both molluscs inhabit the same nearshore environment asH. gammarus. The molluscs were chosen from a variety of prey animals ofH. gammarus in order to demonstrate formation of characteristic shell-fragments recognized by paleozoologists as traces of the meals of littoral decapods. Significant structural details of the shell-fragments are illustrated. Other shell-fragments produced by preying decapods, which often gnaw the hard shells after the meal, are not so easy to identify, although the behaviour patterns of littoral decapod crustaceans are generally quite similar.

The formation of shell feeding-fragments, capable of fossilization, demonstrated on the basis of food uptake inHomarus gammarus (Crustacea, Decapoda)