τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
[Seite 1149] αἱ, nom. plur. von θρίξ, Hom. u. A.
ῶν (αἱ) :pl. de θρίξ.