[wendy1946]

An example: Plato's dialog "The Statesman"

PERSONS OF THE DIALOGUE: THEODORUS; SOCRATES; THE ELEATIC STRANGER; THE YOUNGER SOCRATES....

"Str. Suppose that the nurslings of Cronos[antediluvians], having this boundless leisure, and the power of holding intercourse, not only with men, but with the brute creation, had used all these advantages with a view to philosophy....."

[Craftmore]

ping

[LoneRangerMassachusetts]

"Str. Suppose that the nurslings of Cronos[antediluvians], having this boundless leisure, and the power of holding intercourse, not only with men, but with the brute creation, had used all these advantages with a view to philosophy....."

From the same account:

"...But until some satisfactory witness can be found of the love of that age for knowledge and: discussion, we had better let the matter drop, and give the reason why we have unearthed this tale, and then we shall be able to get on."

Seems clear to me that Plato understands this as a myth.