抄録
A predatory drill hole was found in each of the two drifted dead shells of Lingula cf. reevii collected on the Asa River estuary, Sanyo-Onoda City, Yamaguchi Prefecture, Japan. It was presumed that the hole was drilled by naticid gastropod （probably Paratectona ticatigrina）, and from the morphological characteristics observed in the well preserved specimen, the drill hole was equivalent to ichnospecies Oichnus paraboloides.
