Myrkriða: So A, B. Lit. ‘dark-rider’, a troll-woman who rides through the air in the dark (cf. also kveldriða f. ‘evening-rider’). The word is attested in the pl. form in Hárb 20/2 (NK 81; myrcriðor). Mss R, Tˣ, C have Munn- ‘Mouth-’ which must have been caused by a confusion with the first element in the preceding name (see Finnur Jónsson 1934-5, 304).