[1] = Photius, Lexicon kappa1180 Theodoridis.
[2] Aristophanes, Knights 137 (web address 1), in reference to Kleon (kappa 1731). See already at kappa 1261; cf. Pollux 6.146, 10.85; Hesychius kappa4476. No non-lexicographical reference to this supposed river is made outside Aristophanes (here and at fr. 636 Kock). One of the scholia to the Knights passage offers a different explanation, a circular place where things were sold, yet another scholion to the same passage says that it is not "Kykloboros" that means this but ku/klos ('circle'), and that the term kuklobo/ros refers to Kleon's having been raised in the milieu of the marketplace. A solution to the problem may arise from a fragment of the atthidographer Demon (FGrH 327 F8), preserved in Hesychius omicron309 (also, more sketchily and without attribution, in omicroniota 121): the people of the Attic deme of Oinoe (near the Marathonian plain) had diverted a local torrent (charadra) for irrigation, but at a time of high waters the stream broke its bounds and inundated the ku/klous ('circles', i.e. 'marketplaces'(?)) of the region. Perhaps on this occasion the otherwise unnamed torrent received the (temporary?) nickname of Kykloboros (i.e. 'market-place devourer'). This, at any rate is the theory of Wilamowitz (1882), followed by Jacoby (commentary ad loc.).