- Reithrodrilus, [75], [114]
- Rhinodrilus, [72], [73]
- Rhizodrilus, [39]
- Rhododrilus, [86], [111], [138]
- Rhynchelmis, [39]
- Ripistes, [86]
- Rosadrilus, [75], [115]
- Sea-shore, worms of, [50]
- Sea as a barrier, [124]
- Schmardaella, [36]
- Senses of worms, [65]
- Sparganophilus, [24], [47], [85], [92], [132]
- Spenceriella, [80], [84], [87]
- Structure (see Anatomy)
- Stuhlmannia, [75], [114], [117]
- Stylaria, [37]
- Stylodrilus, [39]
- Sutroa, [39]
- Systematic arrangement, [14]
- Teleudrilus, [76], [115]
- Teleutoscolex, [39], [40]
- Teleutoreutus, [76], [115]
- Telmatodrilus, [38]
- Temperature and distribution, [120]
- Thamnodrilus (see Rhinodrilus)
- Titanus, [23]
- Tokea, [87], [134]
- Trichochaeta, [23], [53]
- Trichodrilus, [39]
- Trigaster, [80], [84], [85]
- Trigastrinae, [15], [72], [80], [82], [84], [136]
- Tritogenia, [77]
- Tubifex, [38], [44]
- Tubificidae, [33], [37], [38], [48]
- Tykonus, [72]
- Zapotecia, [85]
CAMBRIDGE: PRINTED BY JOHN CLAY, M.A. AT THE UNIVERSITY PRESS