Mesoporodrilus, 39 Metadrilus, 75, 114 Metascolex, 76, 115 Metschaina, 75, 114 Microchaetinae, 24, 48, 76, 134, 136, 137 Microchaetus, 23, 77, 95 Microdrili, 31 Microdrilus, 92 Microscolex, 14, 72, 74, 83, 84, 94, 99, 102, 103, 106, 107, 139, 141 Migration of earthworms, 113 Millsonia, 92 Moniligaster, 57, 81, 99 Moniligastridae, 29, 41, 57, 61, 81, 83, 86, 94, 98, 137 Naididae, 33-35 Naidium, 37 Nais, 37 Nannodrilus, 18, 76, 135 Nemertodrilus, 75, 115 Nematogenia, 76, 81, 104 Neodrilus, 87, 95, 138, 141 Neumanniella, 76, 115 New Zealand, earthworms of, 86 Nile, worm of, 50 Notiodrilus, 14-16, 20, 22, 37, 47, 52, 72, 74, 76, 77, 83, 84, 86, 91-94, 111, 122, 126, 134-139, 141 Notoscolex, 80, 84, 93, 137 Notykus, 75, 114 Ocnerodrilinae, 16, 32, 73, 76, 81, 136 Ocnerodrilus, 18, 22, 73, 76, 78, 81, 84, 92, 99, 133 Octochaetinae, 16, 80, 84 Octochaetus, 16, 62, 80, 87, 93, 94, 137 Octolasium, 85, 117 Oceanic islands, earthworms of, 109 Onychochaeta, 23, 72, 73 Opisthodrilus, 72 Papillae, 64 Paranais, 36, 125 Parascolex, 75, 115 Pareudrilus, 75, 115 Patagonia, worms of, 139 Pelodrilus, 42, 111, 112 Peloryctes, 39 Peregrine species, 96 Pereiodrilus, 87, 138 Perichaetidae, 104 Perionyx, 19, 22, 82, 84, 95, 99 Perionychella, 84 Periscolex, 23, 56, 72, 73 Perissogaster, 84 Pheretima, 19, 23, 55, 60-64, 73, 78, 80, 82, 84, 90, 94, 99, 102, 104, 105, 110, 111, 122-124, 131, 135, 138, 141 Phreatothrix, 39 Phreodrilidae, 37 Phreodrilus, 37, 38, 70, 111 Phreodriloides, 38 Phreoryctes (= Haplotaxis) Plagiochaeta, 15, 55, 87, 111, 138 Platydrilus, 75, 114 Pleurophleps, 35 Plionogaster, 19, 29, 82 Plutellus, 80, 84, 87, 93, 95, 111, 133, 134, 136, 137 Polytoreutus, 25, 26, 58, 76 Pontodrilus, 50, 51, 125 Pontoscolex, 20, 22, 23, 66, 72-74, 78, 79, 82, 83, 96, 97, 98, 101, 102, 104, 105, 111 Preussiella, 75, 115 Pristina, 37 Psammoryctes, 38 Pygmæodrilus, 76 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