The use of ichnoterminology for flask-shaped borings is reviewed. The names Gastrochaenolites Leymerie and Teredolites Leymerie are recommended for use as ichnogenera for such borings in lithic and lignic substrates respectively. A range of morphology is recognized for each genus and the following new ichnospecies are described: G. ampullatus, G. cluniformis, G. dijugus, G. lapidicus, G. orbicularis, G. ornatus, G. torpedo, G. turbinatus, and T. longissimus. A key is given for rapid identification of the species, and stratigraphic distributions are given.