^Hesiod, Theogony270-300. Though Herbert Jennings Rose says simply that it is "not clear which parents are meant", Athanassakis, p. 44, says that Phorcys and Ceto are the "more likely candidates for parents of this hideous creature who proceeded to give birth to a series of monsters and scourges". The problem arises from the ambiguous referent of the pronoun "she" in line 295 of the Theogony. While some have read this "she" as referring to Callirhoe (e.g. Smith "Echidna"; Morford, p. 162), according to Clay, p. 159 n. 32, "the modern scholarly consensus" reads Ceto, see for example Gantz, p. 22; Caldwell, pp. 7, 46 295–303; Grimal, "Echidna" p. 143.