260 INDEX. 
H 
Habitat, 236, 240 
Habits and organs, 88 
Hemal 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, 137 
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 
ee plates, 141 
Isolated areas, 239 
J 
Jelly-fish, 154, 155 
K 
Kallima, 61 
Keel in birds, 205 
Keratose sponges, 125 
Labium, 33 
Labrum, 33 
Lamellibranchiata, 165 
Lancelet, 247 
Larve 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 
as viscera, 223 
Mandibles, 33 
Mantle of mollusca, 156, 161, 166 
Mask of dragon-fly larva, 77 
Materials for study, 4 
Matter, 24 
Maxille, 34 
Maxillipeds, 103 
May-flies, 80 
Medulla oblongata, 195 
Medusa, 134, 135 
Mesenteries of sea-anemone, 135 
Mesogloea, 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 
