850 



INDEX 



Alisphenoid bone, 511 

 AUantois, 131, ^Sf), 640 

 Alleles. 652 



multiple, 677 

 Allelomorphs. 652 

 Alligators, 465, 840 

 Alloecoela, 833 

 All or none effect, 101 

 Alplia-totopherol, 527 

 Altricial, 483 

 Alula, 469 

 Aheolar glands, 396 

 Alveolar sac, 533 

 Alveoli, 488, 533 

 Ambulacra! grooves, 367 

 Ambystoma, 449, 840 

 Amehn, 157 

 Amebocytes, 172 

 Amensalism, 765 

 Amia, 440, 839 

 Amino acids, 28, 523 



essential, 29 

 Ammocoetes, 431 

 Ammonia, 95, 454 

 Ammonoidea, 854 

 Amnion, 131, 455 

 Amniotes, 455 

 Amniotic cavity, 131, 640 

 Amniotic fluid, 572 

 Amoebozoa, 832 

 Amphibia, 390, 393, 448, 840 

 adaptations of, 448 

 characteristics of, 447 

 evolution of, 447 



Amphiblastula, 179 



Amphineura, 246, 834 



Amphioxus, 383, 387, 392, 839 



Amphipoda, 305, 836 



Amplexus, 414 



Ampulla, 367, 581 



Amylase, 81, 523 



Anabolism, 15 



Analogous structures, 424 



Anamniotes, 455 



Anaphase, 43 



Anapsida, 840 



Anatomic evidence for evolution, 727 



Ancylostoma duodenale, 808 



Androgens, 618, 620, 627 



Androsterone, 607, 627 



Anemia, 541 



Animal pole, 126 



Anions, 20 



Annelida, 267-288, 834 

 classes of, 268 

 reproduction of, 277 



Anomalops, 76 



Anopheles, 116 



Anoplura, 802, 837 



Anostraca, 303, 836 



Anser, 841 



Antagonism, 607 



Antagonistic muscles, 100 



Anteater, 494 



Antelope, 499 



Anthozoa, 190, 195, 833 



Anthropoidea, 496, 842 



Anthropoids, 738, 740 



Antibodies, 542 



Antidiuretic hormone, 565, 622 



Antigen, 542 



Antigen-antibody reaction, 542, 728 



Anti-reproductive substance, 345 



Antisera. 543 



Antlers, 504 



Antrum, 630 



Ants, 346 



Anura, 394, 448, 840 



Anus, 521 



Aorta, 546 



Aortic arch, 408, 546, 547, 645 



Ape men, 744 



Aphasia, 603 



Apical organ, 286 



Apis mellifera, 317 



Aplacophora, 834 



Apoda (Amphibia), 394, 448, 840 



Apoda (Crustacea), 836 



Apodeme, 97 



Apodes, 839 



Apopyle, 174 



Appalachian Revolution, 723 



Appendages, 486 



Appendicular skeleton, 400, 508, 512 



Appendicularia, 839 



Aptenodytes, 841 



Apterygota, 313, 837 



Apteryx, 841 



Aqueduct of Sylvius, 598 



Aqueous humor, 578 



Arachnida, 320, 321, 835 



Arachnoid membrane, 599 



Arachnomorpha. 290, 320-323, 835 



Aragonite, 57 



Araneae, 322, 836 



Arbacia punctulata, 374 



Archaeopteryx, 478, 706, 717, 841 



Archaeornithes, 479, 841 



Archenteron, 126, 420, 642 



Archeology, 751 



Archeozoic era, 720 



Archiannelida, 269, 834 



Archosaurs, 462, 840 



Arctic foxes, 774 



Arctic tern, 484 



Argiope, 322, 836 



Aristotle, 8, 146, 696 



Aristotle's lantern, 373 



Armadillo, 494 



Arms, 260 



♦ 



