after treating the thessalian families of peisidice and canace, the poet turned to the intermingled aetolian-elian lines of calyce and perimede. perimede had earlier in the book borne two sons to the river achelous, one of whom was the grandfather of oeneus, hippodamas. to aethlius calyce bore endymion, whose son aetolus was the eponym of aetolia and the great-grandfather of demodice and porthaon, through whom the later aetolian and elian genealogies were traced. somewhere within these families, eurytus and cteatus were found in a form more fearsome than they were in the "iliad": in the "catalogue" they were fierce conjoined twins with two heads, four arms and an equal number of legs. most significant for the epic tradition, however, was the marriage of demodice's son thestius and porthaon's daughter eurythemiste which produced the daughters leda, althaea and hypermestra, who are introduced in a group ehoiai at fr. 23a.3–5.