Ind 



ex 



Numbers in boldface type refer to pages on which illustrations occur. Complete scien- 

 tific names of species are in italic type. 



Abalone, 631 



Abomasum, 184 



Aboral surface, 655 



Acanthocephala, 530, 531, 797 



Acanthometron, 441 



Acarina, 593 



Acoela, 507 



Acorn worm, 663, 664, 665, 798 



Acquired characters, 414, 415, 789 



Acromegaly, 272 



ACTH, 267, 271, 272, 277, 304 



Actinophrys sol, 441 



Adaptations, 780-784, 789 



Adaptive radiation, 784 



Addison's disease, 267 



Adenoids, 206, 235 



Adipose tissue, 115 



Adrenal glands, 200, 248, 256, 264, 266, 



269, 271, 274, 348, 697, 709 

 Adrenalin, 266, 273 

 Adrenocorticotrophic hormone (ACTH), 



267, 271, 272, 277, 304 

 Aeroembolism, 226 

 Afferent neuron, 287, 295 

 Age of the earth, 778 

 Agglutinin, 209, 210 

 Agglutinogen, 209, 416 

 Aggregation, 100, 101 

 Agranulocytes, 202, 205, 207 

 Air bladder, 674 

 Air sacs, 608, 729, 744, 745 

 Albumin, 198, 746, 749 

 Alimentary canal, 179 

 Allantois, 377-380, 752, 758 

 Allee, W. C, 93 



Alligators, 716, 718, 722, 723, 799 

 Alternation of generations, 443, 478 

 Alveoli, 232-235, 236, 237 

 Ambly stoma, 230, 683 



tigrimim, 685 

 Ameba, 3, 21-23, 34, 243, 437. 438-443 



AmQha—{C ontinited) 



carolinensis, A'il 



motion of, 430, 438, 439 



proteus, 437 



reaction to stimuli, 440 



reproduction of, 331, 440 

 Amebic dysentery, 430, 443 

 Amebocytes, 461, 463, 464, 562 

 Ameboid cells, 639, 659 

 Amino acids, 31, 32, 65, 79, 169, 192, 194, 



198, 199, 696 

 Amitosis, 43 

 Amiurus, 31 1 

 Amnion, 376, 377-379, 383, 613, 666, 



713 

 Amniotic fluid, 376 

 Amniotic sac, 377 

 Amphibia, 666. 681-713, 798 

 Amphineura, 631, 633, 634, 798 

 Amphioxus, 141, 363, 364, 365, 664, 665, 



798 

 Amphitrite johnstoni, 554 

 Ampulla, 657 

 Amylase, 696 

 Amylopsin, 187, 191 

 Anadromous, 680 

 Anaerobic respiration, 227 

 Anaphase, 40-42, 46, 365 

 Anasa tristis, 406 

 Ancylostoma duodenale, 524 

 Androgen, 343, 344, 348 

 Anemia, 204 

 Anemonia sulcate, 488 

 Animal pole of egg, 359, 361. 367, 368 

 Annelida, 227, 552-571, 663, 798 

 Anolis, 718, 719 

 Anopheles, 445, 446, 447, 528 

 Anoplura, 593 

 Ant lion, 598 



Anteater, spiny, 755, 756, 781, 799 

 Antennae, 601, 602, 611, 619, 620 



comb, 615, 616 

 Anthozoa, 467, 468 



819 



