calcareous, of Madreporaria, [370]

Seriatopora, [401]

Sertularia, [278];

S. abietina, [278]

Sertulariidae, [278]

Serumsporidium, [89]

Sex, binary (= syngamy with marked inequality between the pairing-cells), [33] f.;

of Pterocephalus, [99];

of Stylorhynchus, [99], [100];

of Coccidiaceae, [97] f., [99] f.;