IKDEX. 
309 
Myrmica molesta, 271. 
Mytilus, figure of, ill. 
Myzoxyle mali, apple-aphis, 205. 
Murie, Dr., cited, 41. 
Mushroom, tiny beetles in, 255. 
Mussels, anchoring-threads of, III. 
NAKED-GILLED mollusca, 123. 
Nautilus, structure of, 133. 
Nereis, a sea- worm, 151. 
Nerve-winged insects, 219. 
Nervous system of medusae, 6 1 ; of 
star-fish, 86 ; of mollusca, 109 ; 
of leech, 144; of spider, 189; 
of prawn, 165 ; of a caterpillar, 
238 ; of ants, 276. 
Nests of ants, 279 ; formation of 
new, 283. 
Noctiluca, or night-glow, 15, 19, 21. 
Neuroptera, early origin of, 219. 
Newport, Mr., on metamorphosis, 
236. 
Nodosarina, 23. 
Nummulites forming the Alps, 27. 
"Nurses" of flukes, 138. 
Nurses helping young ant, 281. 
Nut- weevil, 254. 
OAK-EGGAR moth, 246. 
Ocean-snail, lanthina, 125. 
Octopus shooting backwards, 127 ; 
complicated structure of, 126; 
inky fluid of, 128 ; suckers in 
arms of, 129 ; mother and eggs, 
131 ; changing colour of, 129. 
CEconoma, or leaf- cutting ant, 
297. 
Operculum of mollusca, 105. 
Ophiocoma bellis, 84. 
Orang-outang, helplessnessof young, 
266. 
Orbifolite shells, 23, 26, 28. 
Orthoptera, term explained, 210. 
. Ostrea edulis, figure of, 1 08. 
Outcasts of animal life, 135. 
Ovipositor of grasshopper, 21 1 ; of 
bot-fly, 263. 
21 
Oyster, infancy and perils of the, 
109 ; structure of the, 107, 1 08. 
Oyster-beds, 107. 
PACIFIC, coral islands, 55, 71, 74. 
Painted Pufflet, 68. 
Parasites, 136, 141, 177, 199, 260 ; 
degradation of, 141. 
Parasitic beetles, 260 ; mites and 
ticks, 199. 
Paris houses built of orbitolite lime- 
stone, 28. 
Pea-crab, a parasite of the horse- 
mussel, 136. 
Pea-maggot, 255. 
Pearls, how formed, 1 06. 
Pecten, in. 
" Pen " of calamaries, 130. 
Penerepolis, 23. 
Pentacrinus caput-medusse, 78. 
Periwinkle, formation of shell of, 
105 ; inside of a, 115 ; toothed 
rasp of the, 1 1 6 ; gills of the, 
117. 
Pholas, burrowing habits of the, 
U3- 
Phosphorescence, caused by jelly- 
bells, 6 1 ; from one jelly-fish, 
64; of flies and gloworms, 260 ; 
on the sea, 15, 21. 
Phosphoridse, 66. 
Phryganea or caddis-fly, 221. 
Physematium, 29. 
Pincers of scorpion, 179. 
Pinna, anchoring threads of, 1 1 2. 
Planaria, 137. 
Plants, rate of increase of, 4. 
Plant-bugs, 207. 
Plant-lice, 202. 
Plates of brittle-star, 92 ; of sea- 
urchin, 95-97. 
Poison-dart of scorpion, 179; -fangs 
of spider, 183-188. 
Polycistinse or flint builders, 30. 
Polyergus rufescens, mode of fight- 
ing, 288 ; helplessness of, 291. 
Polypites, nature of, 57. 
