Knives, 24. Land Bugs, 86. Leaping Orthoptera, 79. Leitz, lenses of, 16. Lichtenstein on Locusta, 83. Limnaea broken by Dytiscus, 33. _Limnobia replicata_, larva of, 165; De Geer on, 167; pupa of, 168. _Lithobius forficatus_, 122; De Geer on, 123; Dr. Sharp on, 123. _Locusta viridissima_, 80; Dr. Sharp on, 80, 85; De Geer on, 80, 83; Westwood on, 81; Kirby on, 83; Lichtenstein on, 83; ear of, 85. Locustidae, 80. Lowne, Professor, on Dytiscus, 45. Lubbock, Sir J., on Dytiscus, 42; on Blatta, 68; on Corixa, 95; on Opossum Shrimp, 135. Lyonnet on larva of Hydrophilus, 164; on Ptychoptera, 186. Magnification, power of, 15 _n._ Mainland, Mr. G. E., on Water Mites, 118. Malacostraca, 128; Rev. T. R. R. Stebbing on, 128. Margined Water Beetle, 31. Masking Crabs, 150. _Melicerta janus_, 150. Miall, Professor, on Dytiscus, 45; on Sialis larvae, 179, 181. Microscopes, use of, 11; description of, 15. Millepedes, 121, 125. Mites, description of, 112. Model, a calico, 30. Myriapods, 96, 120. Mysis, 135. _Nature Notes_ on Millepedes, 121. Needles, 23. _Nepa cinerea_, 86; mode of keeping, 88; Swammerdam on, 89; Dr. Hill on, 90; Rev. G. C. Bateman on, 91; anatomy of, 91. Noises made by insects, 84. _Notonecta glauca_, 93. _Ocypus olens_, 57; Kirby on, 59; as a pet, 59; Dallas on, 61; larva of, 61. Opossum Shrimp, 135; Sir J. Lubbock on, 135. _Orchestia littorea_, 151. Orthoptera, 63. Ovipositors, 82. _Palaemon serratus_, 129. _Palaemonetes varians_, 130. _Paraponyx stratiotata_, 171; De Geer on, 172; Mr. Hart on, 173; anatomy of, 174. Peripatus, 30; Professor Sedgwick on, 31. _Periplaneta americana_, 74. Pholcus, 103. Phylum, definition of, 27. Planorbis broken by Dytiscus, 33. Plateau, Professor, on Blatta, 74. Pocket lens, description of, 13. Pocock, Mr., on Geophilus, 125. Podophthalma, 129. _Porcellana platycheles_, 139. Prawns, 129; Gosse on, 133; Sowerby on, 133. Ptychoptera, larva of, 182; pupa of, 187; Réaumur on, 185; Lyonnet on, 186. Quekett Microscopical Club, incident at, 20. ‘Rat-tails,’ 182. Réaumur on Ptychoptera, 185. Robertson, Mr., on Talitrus, 151. Salter, Dr. J., on Gammarus, 147. _Salticus scenicus_, 105; Kirby and Spence on, 107; foot of, 108. Sand-hopper, 151. Scorpions, 96. Sedgwick, Professor, on Peripatus, 31. Sharp, Dr., on Dytiscus, 47; on Blatta, 65; on Forficula, 79; on Locusta, 80, 85; on Lithobius, 123; on Julus, 126; on wings of Hymenoptera, 170.