INDEX. 



Abalone, 275 



Abducens nerve, 136 



Acanthoderus, 183 



Acanthopteri, 28 



Acarina, 232 



Accessorms nerve, 136 



Acephala, 258, 277 



Acerata, 228 



Acetabulum, 45 



Acmaea, 275 



Acorn barnacles, 211 



Actinozoa, 301 



Adam's apple, 144 



Adductor muscles, 248 



Adrenal, 42 



Aglossa, 50 



Air-bladder, 12, 35, 145 



Air-cells, 42 



Air-sacs of bird, 61, 72 



Air-tubes, 174 



Aix, 79 



Ala spuria, 60 



Albatross, 80 



Alcohol, 341 



Allantois, 55, 66 



Alligators, 70 



Alpaca, 118 



Alternation of generation, 307, 



335 



Alytes, 53 

 Ambulacra, 278 

 Ambulacral plates, 280 

 Ambulacra! groove, 281 

 Ametabola, 217 

 Ammonites, 267 

 Amnion, 55, 66 

 Amphibia, 49 

 Amphiccelous, 14, 129 

 Amphipoda, 168 



Amphitrite, 241 



Amphioxus, 153 



Ampulla of sponge, 314, 316 



Ampulla of starfish, 279 



Anacanthini, 26 



Anaconda, 68 



Anal area, 282 



Anal plates, 283 



Anatomy, 324 



Angleworm, 239 



Animal kingdom, 337 



Annelida, 239, 246 



Anolis, 67 



Anomura, 164 



Ant-eater, 106 



Antelope, 119 



Antennae, 159 



Antennulse, 159 



Anthropoid apes, 124 



Antilocapra, 119 



Ant-lion, 221 



Ants, 189 



Anura, 53 



Aorta, 13, 88 



Aortic arch, 43 



Apes, 124 



Apoda, 293 



Apparatus, 2 



Aptenodytes, 79 



Aqueous humor, 140 



Arachnida, 229 



Araneida, 230 



Arbor vita?, 95 



Arch, haemal, 14 



Arch, neural, 14 



Archaeopteryx, 76 



Argynnis, 204 



Aristotle's lantern, 283, 288 



Armadillo, 105 



345 



