ὅσα ἦν νενοσσευμένα ὀρνίθων γένεα → as many species of birds as had their nests, all the other kinds of birds which had been hatched
3ᵉ pl. impf. épq. et ion. de εἶμι.
ἤϊσαν: эп.-ион. (= ᾖεσαν) 3 л. pl. impf. к εἶμι.