Teleostomi, [282], [283];

Dipnoi, [285], [286];

mechanism of respiration, [288];

larval gills, [289], [290];

air-bladder as a respiratory organ, [291];

accessory organs of respiration, [292], [293], [294], [295]

Retropinna, [566], [565]

Retzius, [113]

Rhabdocynthia, [75];

spicules, [87]