Abstract
Some morphological features of fossil predatory boreholes made by naticids and muricids in Eocene gastropod and bivalve shells have been studied. Holes with countersunk walls are restricted to preyed bivalve shells which display a thick outer cross lamellar layer. Irregular inner and outer margins of boreholes which are common in gastropods but rare in bivalves, may be due to rasping, thickness of the inner shell layer of the preyed shell and breakage. Four types of incomplete holes are identified, depending on the shape of the base. Most of the incomplete holes in gastropods are located in the body whorl. In bivalve shells the highest number of incomplete holes is located in the middle sector of the shell. The type of incomplete boring is indicative of the borer responsible for the hole.
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