development, [458], [458];

species, [460];

affinities, [461], [512]

Phosphorescence (and light-producing organs), in Rotifers, [226];

in Polychaeta, [272], [295], [296];

in Oligochaeta, [368];

in Polyzoa, [478]

Photodrilus, [368], [383]

Photogen (light-producing organ), of Polyophthalmus, [272];

of Tomopteris, [296], [315]