Yes, here is the exact passage from Appian’s The Civil Wars (Book 3, Chapter 95) covering the accusation and arrest of the city praetor, Quintus Gallius, concluding right at the phrase "he was nowhere seen again."[1]

Greek Text

"Γάλλιον δὲ τὸν στρατηγὸν τῆς πόλεως, αἰτησάμενόν τινα Λιβύης ἐπιμέλειαν, ὡς ἐπιβουλεύοντα Καίσαρι, συλλαβόντες οἱ στρατιῶται κατέσχον. καὶ αὐτὸν ἡ βουλὴ κατακρίνουσα τῆς ἀρχῆς ἀπέλυσεν· ὁ δὲ Καῖσαρ ἐκέλευσεν αὐτὸν ὡς τὸν ἀδελφὸν ἀπιέναι Μάρκον, καὶ ἐπιβὰς νεὼς οὐδαμοῦ ἔτι ὤφθη."

English Translation (Horace White / Loeb Classical Library)

"Gallius, the city praetor, having requested a command in Africa, was arrested by the soldiers on the charge of plotting against Caesar. The Senate condemned him and deprived him of his office; Caesar ordered him to go to his brother Marcus, but after he went on board a ship, he was nowhere seen again." [1, 2]

Historical Context Note

This specific passage highlights the delicate overlap between the formal Senate protocols and Octavian's unilateral authority during the late Roman Republic. By sending Gallius to his brother, Marcus (who was with Mark Antony), Octavian was technically facilitating his exile, but the sudden disappearance of Gallius at sea generated the alternate, dark rumors that Suetonius preserved. [1]

If you are examining other political disappearances from this period, would you like to see how the sources handle the proscriptions or other missing figures from the Second Triumvirate?