INDEX. 
A 
Abdomen of Crustacea, 102 
“ “ grasshopper, 32 
“ il insects, 32 
Aboral surface, 140 
Acephala, 165 
Actinozoa, 137 
Activities of amoeba, 116 
11 “ bird, 199 
u “ butterfly, 47 
11 li earthworm, 150 
11 11 fresh-water mussel, 
158 
** “ frog, 181 
“ 11 grasshopper, 36 
“ “ hydra, 129 
“ “ spider, 93 
“ “ starfish, 142 
Adaptations, 86 
Adductor muscles, 156, 159 
Air-sacs of birds, 205 
“ “ spiders, 97 
Alimentary canal, 37 
Alternation of generations, 133 
Ambulacral areas, 141 
“ feet, 140 
Amoeba, 116 
Amphibia, 192 
Amphioxus, 247 
Ampullae, 141, 143 
Analogous organs, 106 
Anatomy, 30 
Angleworm, 148 
Animal kingdom, 2 
Animal relationships, 243 
Annulata, 148 
Anodon, 155, 157, 254 
Anosia plexippus, 68 
Antennae, 33 
“ of crayfish, 105 
<< “ grasshoppers, 33 
Antennules, 105 
Aorta of fish, 170 
“ “ frog, 195 
Apes, 232 
Aphis, 72 
Apparatus, 4 
Appendicular skeleton of frog, 189 
Aquaria, 8 
Arachnida, 113 
Archaeopteryx, 209 
Argonaut, 166 
Aristotle’s lantern, 146 
Arthropoda, 2, m 
Ascidians, 246 
Asellus, 86 
Assimilation, 118 
Asterias vulgaris, 140 
Atlas bone, 188 
Auditory nerves, 173 
Auricle of fish, 170 
Aves, 254 
Axial skeleton, 220 
“ “ of frog, 188 
B 
Balancer of fly, 58, 67 
Barnacles, no 
Barriers, 238 
Basipodite, 104, 107 
Bat, 222 
Batrachia, 192 
Bees, 89, 90 
Bilateral symmetry, 32 
Biology, 25 
Birds and insects, 200 
“ “ reptiles, 205 
Blood-corpuscles, 184 
Blue-bottle fly, 57 
Bluejay, 23 
Bones of fish, 173 
“ “ frog, 188 
257 
