of Luidia, [605];
of Asterina gibbosa, [463], [610], [611], [612];
of Ophiuroidea, [606];
of Echinus, [607];
of Synapta, [608];
of Antedon rosacea, [618], [619], [620]
Larval brain, of Echinopluteus, [607];
of Antedon rosacea, [619]
Larval type of development, [601]
Lateral mouth-shields of Ophiothrix fragilis, [485]