Likewise Apostolius 10.48. Photius, Lexicon lambda103 Theodoridis gives the phrase as 'a gull in Nemesis', which one might have thought the preferable lectio difficilior, but Theodoridis, while printing it, mentions Dindorf's rejection of it; also Dobree's suggestion that it is the title of a play by Cratinus.
For proverbial gulls see also lambda 127.