Left: complete Bargmannia elongata Totton, 1954 (Siphonophorae, Physonectae, Pyrostephidae) from the Bahamas, height of nectosome about 9 cm.
Right: Bargmannia lata Totton, 1954, detail, note the long array of swimming bells (nectosome).

Pictures with kind permission of Stephen Haddock, see The Bioluminescence Web Page .