Obstruction Sound, tides, [352]

remarks, [352].

Oidemia Patachonica, [35].

Oliver Islands, [351].

Ophidium, near Cape Fairweather, [8].

Orange Bay, [426], [427]

anchorage, productions, [430].

Orthoceratite, fossil resembling an, Rocky Bay, [321].

Osorio Pedro, at Chilóe, Byron, 'Desecho,' [327].

Ostrea Edulis, at Chilóe, [291].