of Polystomatidae, [57];
of Diplozoon, [60];
of Gyrodactylus, [61];
of Distomum macrostomum, [65];
of Calliobothrium, [75];
of Archigetes, [76];
of Schistocephalus, [86];
of Rhopalura, [95];
of Myzostoma, [343]—see also Reproductive organs
Ovicell, in Cheilostomata, [466], [466], [468], [481], [482], [484], [522] f., [525];