Acras'peda (Gr., 'without a border'), a term applied to Jelly-fishes (q.v.) without an inward fringe or velum round the edge of the disc. Rhizostoma, Pelagia, Aurelia are common representatives.
Acras'peda
Chambers's Encyclopaedia, Volume 1: A to Beaufort, p. 39
Source scan(s): p. 0052