INDEX 



[The names of the genera cited are printed in italics. The numerals refer to pages. 

 Those in bold-faced type indicate that the object is illustrated on that page]. 



Absorption, 67 

 Abyssal fauna, 137 



Aca;l:ephs, 246 



Acanthocephala, 204 



Acclimatization, 13, 107 



Achromatin, 21, 27 



Acquired characters, loi, 104 



Actinozoa, 186 



Adaptation, means of, 107; types of, 

 113; to inorganic environment, 114; 

 to mates, 116; to offspring, 117; 

 social, 122; competitive, 123; com- 

 mensal, 124; symbiotic, 124; to prey- 

 ing, 127; for protection, 127 



Adaptive habits and instincts, 134 



Adipose tissue, 56 



Adrenals, 342 



Aepyornis, 413 



Aerial fauna, 138 



Age of man, 475 



Air-sacs (birds), 405 



Aix, 413 



Albatross, 415 



Alimentary canal (see digestive sys- 

 tem). 



AUantois, 392, 409 



Alligator, 397 



Alternation of generation — in Ccelen- 

 terates, 179; in worms, 192, 197 



Ambulacral system, 214 



Amitotic cell division, 24 



Ammonites, 263 



Amnion, 392, 409 



Amoeba, 1-5, 23, 93, 150 



Amphibians, 146, 376 



Amphioxus, 313, 314 



Amphitrite, 237 



Amphiuma, 381 



Ampullae, 215 



Anabolism, 67 



Anacanthini, 374 



Analogy, 85 



Anaphase, 25 



Anatomy, 3, 521 



Animalcules (see protozoa). 



Animal industries, 508 



Annelida, 148, 223, 237 



Anodonta, 239, 259 



Anseres, 416 



Ant-eater, 452 



Antenna, 268 



Antennule, 270 



Antero-posterior (see symmetry). 



Antimeres, 97 



Ants, 123, 307 



Aorta, 339 (see circulatory system). 



Apes, 460 



Aphis (plant lice), 300 

 Apoda, 384 



Appendages — arrangement of, 97; in 

 arthropods, 277; in vertebrates, 325; 

 in fishes, 360; in amphibians, 377; 

 in birds, 402 



Appendicular skeleton, 331, 333 



Appendix, 446 



Applications of zoology, 508 



Aptera, 298 



Apteryx, 407, 411 



Aquatic fauna, 137 



Arachnida, 307 



Araneida, 308 



Arhacia, 210 



ArchiBopteryx, 410 



Archenteron, 38,-41 



Archipterygium, 361 



Argonauta, 264 



Aristotle's lantern, 211 



Armadillo, 452 



Army-worm, 405 



Arterial arches, 339 



S4S 



3.'! 



