but they have, in the same relative position with the frena, large, much-folded membranes, which freely communicate with the circulatory lacunae of the sack and body, and which have been considered by all naturalists to act as branchiae.
baina, galgen kokagune erlatibo berean, mintz handi eta ongi tolestuak ditu, zakuaren eta gorputzaren zirkulazio-aintzirekin libreki komunikatzen direnak, eta naturalista guztien ustez brankia moduan lan egiten dutenak.