Osphromenus, [669], [293];

O. olfax, [669]

Osphyolax, [634]

Ostariophysi, [573] f., [306], [389]

Osteochilus, [582]

Osteogeniosus, [588], [593]

Osteoglossidae, [555], [544], [294], [405];

larval gills, [290];

distribution, [557]

Osteoglossum, [557];