26 o 
INDEX. 
H 
Habitat, 236, 240 
Habits and organs, 88 
Haemal arch, 174 
“ cavity, 174 
Hair, 229 
Hands and feet of mammals. 227 
Haustellate, 56 
Head of insect, 33 
Heart of frog, 183 
Hemiptera, 65 
Heredity, 250 
Hermaphrodite, 131 
Hermit-crab, 18 
Hinge ligament, 162 
Histology, 31 
Homologies, 107 
Homologous organs, 106 
Hoofs, 230 
Horns, 230 
Hornwort, 9 
House-fly, 5 
Humerus of frog, 189 
Hydra, 10, 128 
Hydractina, 131 
Hydrozoa, 13 7 
Hymenoptera, 66 
I 
Ichneumon-fly, 74 
Imago, 49 
Incisors, 212 
Infusoria, 121 
Inhalent pores of sponge, 124 
Insect adaptations, 86 
“ communities, 89 
Insects and plants, 91 
Interambulacral areas, 141 
“ plates, 141 
Isolated areas, 239 
J 
Jelly-fish, 154, 155 
K 
Kallima, 61 
Keel in birds, 205 
Keratose sponges, 125 
L 
Labium, 33 
Labrum, 33 
Lamellibranchiata, 165 
Lancelet, 247 
Larvae of butterflies, 48 
Lateral line, 169 
Leech, 13 
Lepidoptera, 45, 46 
Life, 24 
Life-histories, 68 
Limenitis Ursula, 53 
Lingual ribbon, 166 
Lithobius, 98 
Living matter, 24 
Lobster, 102 
Locust, 32 
M 
Madrepora, 136 
Madreporic body, 140 
Mammals, 217 
Mammalian skeleton, 218 
“ viscera, 223 
Mandibles, 33 
Mantle of mollusca, 156, 161, 166 
Mask of dragon-fly larva, 77 
Materials for study, 4 
Matter, 24 
Maxillae, 34 
Maxillipeds, 103 
May-flies, 80 
Medulla oblongata, 195 
Medusa, 134, 135 
Mesenteries of sea-anemone, 135 
Mesoglcea, 123 
Metamorphosis of insects, 47 
Microgaster-fly, 75 
Migration, 238 
Milkweed butterfly, 68, 237 
Mimicry, 53, 250 
Mollusca, 2, 165, 166 
Morula, 249 
Moths, 45 
Moulting, 39 
Mouth-parts of insects, 33, 34, 35 
Mud-wasp, 61 
Muscles of frog, 188 
Mussels, 8, 155 
