N 
Names of insects, 66 
Natatores, 208 
Natural selection, 54 
Nauplius, 111 
Nautilus, 166 
Nemathelminthes, 253 
Neuroptera, 65 
Nettling cells, 129 
Neural arch, 173 
“cavity, 174 
“spine, 174 
Nictitating membrane, 197 
Nitrogen, 27 
Notochord, 177 
Nucleus, 117 
Nutrition, 30 
he of grasshopper, 37 
Oo 
Ocelli, 33 
Olfactory lobes of fish, 173 
Oésperms, 131 
Operculum of snail, 164 
Optic lobes of fish, 173 
Oral surface of starfish, 140 
Orders, 112 
‘6 of insects, 64 
Orthoptera, 65 
Oscula of sponge, 124 
Osmosis, 38 
Ovipositor, 33 
Oxidation, 27 
P 
Pallial line, 156 
Palpi, 34 
Paramecium, 122 
Parthenogenesis, 73 
Passeres, 208 
Pearls, 161 
Pectoral fins, 169 
Pectoral girdle, 175 
Pedal ganglia, 162 
Pedicellariz, 140 
Pelecypoda, 165 
Pelvic girdle, 175 
Peritoneum, 181 
Phalanges, 189, £99 
Phosphorescence, 114 
INDEX. 261 
Phylum, 1, 2 
Physiology, 30 
Pisces, 175 
Plantigrade feet, 227 
Plant-lice: see Aphis 
Pleurum, 32 
Poison-fangs of spiders, 97 
Polyp, 135 
Polyzoa, 253 
Pond-snail, 163 
Pond-weed, 9 
Porifera, 125, 254 
Preparation of specimens, 17 
Preservation of specimens, 19 
Primates, 254 
Proboscis of moth, 50 
Prolegs, 69 
Protection of birds, 200 
Protective coloring, 52 
Protopodite, 104, 107 
Protozoa, 116, 123 
Pseudoneuroptera, 65 
Pseudopodia, 119 
Pterodactyl, 245 
Pupation, 70 
R 
Radiate symmetry, 2 
Range of animals, 237 
Raptores, 208 
Reference-books, vi 
Repair, 26 
Reproduction, 30 
we of ameeba, 118 
“ ‘* grasshopper, 37 
Reptilia, 192 
Resemblances, 61, III 
Respiration of grasshopper, ‘ 
Rhivopeda, rr ERE 2 
iS) 
Sand-wasp, 74 
Sarcoda, 123 
Sauropsida, 207 
Scansores, 208 
Scyphozoa, 134, 137 
Sea-anemone, 15 
“© cucumber, 146 
“ squirt, 246 
“urchin, 145 
Sedentary, 115 
