Silurichthys, [588]
Siluridae, [586], [575], [163], [251], [275], [283];
barbels, [154];
intestinal respiration, [292];
accessory respiratory organs, [293], [294];
air-bladder, [302], [303], [305];
sound-production, [356]-[361], [363];
connexion of the air-bladder and auditory organ, [389], [390];
nests, [416];
protection of young, [593]