nervous system, [488];

genital organs, [489]

Ophiura (Ophioglypha), [496];

O. albida, [497];

O. bullata, [495], [496];

O. ciliaris, [485] n., [497]

Ophiuroidea (Brittle Stars), [431], [477] f., [561];

mesenchyme of larva, [604];

development of, [606], [606], [608], [613];

phylogeny, [622]