Like this case, from the entry under "The Monster Acheron":
"!n [sic] the tenth book of the Odyssey . . . "
It is difficult for me to imagine a copy editor who would mistake "!" for "I" . . .
Some editions gloss the ancient authors in modern English; others maintain (or fabricate?) an ancient patina, like this gem regarding the Crocotta:
"Pliny writes (VIII, 21) that the Crocotta is an animal `ingendred betwixt a dog and a Wolfe [sic]'"
Well, no--Pliny was writing in Latin, wasn't he? So this citation, this gem, would seem to be from a medieval English translation.
From Latin to medieval English to modern Spanish, then back to medieval English again?!
Then again, all this textual variation seems so very "Borgesian" in itself!