Ousel, Ring-, [510];

Water-, [519]

Oustalet–see Milne-Edwards

Oven-bird, [485];

nest, [485]

Oviedo, on a Humming-bird, [426]

Owen, on Archaeopteryx, [23];

on Dinornithidae, [41];

on Dodo, [330]

Owl, [175], [179], [180], [397] f.;