Cratylus 393bc and the Prehistory of Plato’s Text

I discuss a textual problem at Cratylus 393bc and, after establishing the correct text, argue that the MSS readings point to the existence of a textual variant in the margin of an ancestor of the common source of our MSS, presumably an ancient edition of the dialogue. Then I make the further hypothesis that both readings originated as alternative attempts to interpret Plato's ambiguous orthography.