INDEX 



Abdomen, 348, 639 

 Abducens nerve, 527 

 Abductor muscle, 524 

 Abomasum, 633 

 Abyssal zone, 713, 770 

 Acanthocephala, class, 175, 178, 179 

 Acarina, order, 266, 295. 297 

 Accipiter, 590 

 cooper i, 589 

 Accommodation, 402 

 Acetabulum, 495, 522, 611 

 Achiridae, family, 452 

 Aciculum, 19 6 

 Acidian larva, 367 

 Acipenser fulvescens, 447 

 Acipenseridae, family, 446 

 Acnidosporidia, 73 

 Acoela, 160 

 Acontia, 141 

 Acris gryllus, 485 

 Acromegaly, 6 73 

 Actinaria, order, 140 

 Actinophrys, 67, 69 

 Acusticolateral areas, 435 

 Adambulacral plates, 229 

 Adaptability and regeneration, 695 

 Adaptation, 727 

 Addison's disease, 671 

 Adductor mandibulare, 468 



muscles, 250, 254 

 Adhesive papillae, 367 

 Adipose fin, 442, 457 

 Adrenal glands, 671 

 Adrenalin, 671 

 Adrenin, 671 

 Aedes, 80 



Aegeria exitiosa, 328 

 Aegeriidae, family, 328 

 Aeolis, 241 



Aeolothrips fasciatus, 320 

 Agamodistomum, 759 

 Agassiz, 43 

 Agassiz' tortois! , 550 

 Aglypha, 556 

 Agnathostomata, 412 

 Agriculture, 34 

 Albatrosses, 587 

 Albulidae, family, 448 

 Albumin gland, 246 

 of hen's egg, 615 

 Aloes americana, moose, 630 

 Alcyonacea, order, 143 

 Alcyonaria, subclass, 143 

 Alcyonium, 143 

 Alfalfa beetle, 324 

 Alimentary canal, 109 

 AUantois, 818 

 Allelomorph, 823, 824 

 Allelomorphs, multiple, 827 

 Allergy, 839 



Alligator mississippiensis, 561 

 Alligators, 560 

 AUocosa parva, 295 

 Alopecia, 838 

 Alpacas, 630 

 Alpine zone, 714 

 Alteration of generation, 112 

 Altricial birds, 615 

 Alveoli, 566 

 of lungs, 514 



Alytes obstetricans, 480 

 Amblema costata, 248 

 Amblyopsidae, family, 451 

 Ambulacral groove, 218, 224, 227, 228 

 ossicle, 229, 230 

 plate, 228 

 Ambystoma, 484 

 axolotl larva, 481 

 texanum, 480 

 tigrinum, 478, 480 

 Ambystomoidea, suborder. 484 

 Ameiuridae, family, 450 

 Ameiurus, arteries, 461 

 cranial nerves, 469 

 internal structure, 458 

 life history, 470 

 natalis, 457 

 skeleton, 466 

 veins, 462 

 Ametabolous, 3 08 

 Amiidae, family, 4 47 

 Amino acids, 57 

 Amitosis, 61 

 Ammocoetes, 420 

 Ammonite, 259 

 Amnicola, 245 



comalensis, 247 

 Amnion, 818 

 Amoeba, 85 



assimilation, 88 

 behavior, 91 

 digestion, 87 

 excretion, 88 

 histolytica, 744 

 locomotion, 91, 92 

 metabolism, 86 

 proteus, 67 

 reproduction, 89 

 Amoebic dysentery, 78 

 Amoebina, 67 

 Amoebocytes, 233 

 Amoeboid acivity, 152 

 Amphiaster, 63 



Amphibia, breeding habits. 479 

 class, 411. 472 

 classification, 482 

 coloration, 474 

 economic importance, 486 

 enemies of, 477 

 families of, 484 

 hibernation, 480 

 means of defense, 478 

 regeneration, 477 

 secondary sexual characters, 480 

 Amphibian voice, 478 

 Amphibians, tailless, 485 

 Amphiblastula, 128, 808 

 Amphicoela, suborder, 485 

 Amphicoelous centrum, 444 

 Amphids, 175 

 Amphineura, 256 

 Amphioxus, 361, 368 

 circulatory, 371. 372 

 respiratory system, 373 

 Amphiplexus, 409 

 Amphipoda, order, 265 

 Amphipods. 283 

 Amphisbaenidae, family, 555 

 Amphitrite, 195 

 Amphiuina, 473 

 Amphiumidae, family. 4 84 

 Ampulla. 222, 229, 230, 231 



923 



