| Species | Name Used |
|---|---|
| Sphaeroma walkeri Stebbing, 1905 | Sphaeroma walkeri (p. 82 ) |
| Spirobranchus giganteus (Pallas, 1766) | Spirobranchus tricornis (p. 81 ) |
| Spirobranchus kraussii (Baird, 1864) | Pomatoleios kraussii (p. 81 ) |
| Stenothoe gallensis Walker, 1904 | Stenothoe gallensis (p. 82 ) |
| Striatobalanus amaryllis (Darwin, 1854) | Balanus amaryllis (p. 82 ) |
| Styela canopus (Savigny, 1816) | Styela canopus (p. 83 ) |
| Styela plicata (Lesueur, 1823) | Styela plicata (p. 83 ) |
| Syllis hyalina Grube, 1863 | Syllis hyalina (p. 81 ) |
| Syllis variegata Grube, 1860 | Typosyllis variegata (p. 81 ) |
| Symplegma brakenhielmi (Michaelsen, 1904) | Symplegma brakenhielmi (p. 83 ) |
| Trypanosyllis taeniaformis (Haswell, 1886) | Trypanosyllis taeniaformis (p. 81 ) |