Fig. 5 in Taxonomic notes on "Phoebodus heslerorum" and Symmorium reniforme (Chondrichthyes, Elasmobranchii).

Fig. 5. "Ctenacanthus" costellatus Traquair, 1884, isolated, incomplete teeth from specimen NHM−P 20144−5 from Eskdale, Dumphrieshire, Scotland, Lower Carboniferous. A. Lingual view of a five−cusped tooth, the cusps and the right side of the base are missing. B, C. A half of a sevencusped tooth in labial and basal views; the lingual side is embedded in rock. Scale bar 1 mm. SEM micrographs.