Air-bladder, as an accessory respiratory organ, [291] f.;

Amia, [291];

Lepidosteus, [291], [299];

Sudis gigas, [291];

Erythrinus taeniatus and E. braziliensis, [291];

Neoceratodus, [291], [300];

Protopterus, [291], [301], [302];

Lepidosiren, [291];

structure, [297];

in different Fishes, [298];