Disc, in Rotifers, [200], [202] f., [202]

Discharge, of genital cells;

Nemertinea, [116];

Archiannelida, [244];

Polychaeta, [256], [274], [275]

Discobdella, [226]

Discocelis, [19], [23]

Discodrilidae, [350], [376], [392], [395]

Discopus, [201], [222], [226], [227]

Dispharagus, [147], [149], [163]