INDEX. 



Abalone, 199 



Abdomen of arthropods, 217 



Abducens nerve, 300 



Aboral, 110, 276 



Abyssal fauna, 412 



Acanthias, dissection of, 15 



Acanthoderus, 245 



Acanthopteri, 331 



Acarina, 234 



Accessorius nerve, 300 



Acephala, 202 



Acerata, 231 



Acetabulum, 38 



Acipenser, 326 



Acmsea, 199 



Acorn barnacle, 224 



Acquired variations, 417 



Actinozoa, 171 



Adambulacral areas, 275 



Adam's apple, 309 



Adductor muscles, 99 



Adrenal gland, 34 



Afferent arteries, 18, 27, 311 



Afferent nerves, 298 



Aglossa, 341 



Air-bladder, 26, 310, 320 



Air-sacs, 50, 351 



Ala spuria, 49 



Albatross, 358 



Alcohol, 5 



Alligators, 349 



Alpaca, 385 



Alternation of generations, 167, 



408 



Altrices, 352 

 Alum cochineal, 9 



Alytes, 341 



Ambergris, 379 



Ambulacra, 110, 274 



Ambulacra! areas, 113, 115, 275 



Ambulacral groove, 113 



Ambulacra! plates, 113 



Ambulacra! pores, 113 



Ambulacral system, 274 



Ametabola, 241 



Ammonites, 211 



Amoeba, 148 



Amoeba, study of, 132 



Amphibia, 336 



Amphicoelous, 27, 292 



Amphioxus, 289 



Amphineura, 197 



Amphipoda, 230 



Amphitrite, 186 



Ampullae, 111, 117, 275 



Ampullae of sponge, 130, 159 



Anacanthini, 329 



Anaconda, 347 



Anal area, 116 



Anal cercus, 77 



Anal fin, 16, 23 



Anal plates, 116 



Analogy, 144 



Angle-worms, 187 



Angulare, 39 



Animal Kingdom, 137 



Animals and Plants, 137 



Annelida, 183 



Anodonta, 98 



Anolis, 346 



Anomura, 226, 227 



Ant-eaters, 372. 374 



421 



