Oviduct, [49], [51]

Owen, on fossil Reptiles, [303] n.

Oxydactyla, [140]

Oxyglossus, [239], [241]

Pachytriton, [96], [115];

P. brevipes, [132]

Painted Terrapin, [347], [348];

rate of growth, [349]

Palaeobatrachus, vertebral column, [22], [145]

Palaeohatteria longicaudata, [291];