Note 7 — BOOK VII. (continued 2)

This is a pun on the similarity of the name Gela to γέλως, laughter, the compound κατάγελως meaning derision. And it is probably borrowed from Aristophanes, who says, Acharn. 606:—

τοὺς δ᾽ ἐν καμαρίνῃ κᾀν γέλᾳ κᾀν καταγέλᾳ.