Scalibregmidae, [258], [334]

Scapha, [259], [330]

Scaridium, [201], [207], [225]

Schistocephalus, [75], [91];

reproductive organs, [86];

larva, [84];

life-history, [78], [85]

Schizocerca, [225]

Schizogamy, in Syllidae, [278], [279], [281]

Schizonemertea, [109];