INDEX 



All numbers in this index refer to pages; those in bold face type contain figures or 

 illustrations of the entries. Scientific names of genera and species are in italics. The 

 index omits many references to common structures such as the brain of the earthworm, 

 but there is an entry for the earthworm, and in that section of the text the brain will 

 be found, 



Aardvark, 464, 496 



Abalone, 299 

 Abdomen, crayfish, 200 



grasshopper, 230, 231, 233 



spider, 267, 269 

 Abdominal appendage, 202 



cavity, 331 



vein,' 337, 338 

 Abducens nerve, 351, 353, 546 

 Abiogenesis, 602 

 Abiotic substances, 635 

 A-B-O blood groups, 527 



inheritance of, 590, 591, 596 

 Abomasum, 488 

 Aboral end. 1 30 



pore, 106,112 



side, 56 

 Absorption, 86, 524 

 Abyssal zone, 632, 642 

 Acanthocephala, 149, 160, 161 



classification, 161, 162 

 Acanthometron, 41, 76 

 Acarina, 268, 279 

 Accentors, 462 

 Accessory glands, 226 



nerve, 546 



spinning organs, 270 

 Acerentulus, 260 

 Acetabulum, 345, 467 

 Acetylcholine, 555 

 Achordate body plan, 316 

 Achorutes, 262 

 Aciculi, 184 

 Acipenserida, 394 

 Acipenseridae, 379 

 Acnidosporidia, 53 

 Acoela, 147 

 Acoelomata, 191 

 Acontia, 123 



Acorn worm, 315, 321, 322, 606 

 Acquired characters, 598, 621 



traits, 598 

 Acris, 402 

 Acromegaly, 553 

 ACTH, 156 



Actinophrys, 40, 41 

 Actinopoda, 41 

 Actinopter^gii, 379, 394 

 Adaptations, 6 



environmental, 609 



forelimbs, 613 



physiologic, 250 



structural, 250 

 Adaptive convergence, 610, 612 



mammals, 482 



modifications, insects, 243-249 



radiation, 610, 611 

 Addison's disease, 552 

 Adductor, anterior, 283, 284, 285 



brevis, 348 



longus, 347, 348, 350 



magnus, 347, 348, 350 



posterior, 283, 284, 285 

 Adhesive pad, 120 

 Adrenal, 552, 553 



gland, 330, 341,342 

 Adrenalin, 552, 553 

 Adrenocorticotropic hormone, 



156 

 Aeolosoma, 187, 189 

 Aepyornis, 449, 459 

 Aepyornithiformes, 458 

 Aerial animals, 647 

 Afferent cliannels 207, 208 



vein, 287 

 Africa ape man, 624 

 African crocodile, 420 



elephant, 484, 487 



lungfish, 645 



ostrich, 461 



sleeping sickness, 70, 262 

 Agama, 407, 430 

 Agamidac, 407, 430 

 Age of fishes, 392 



invertebrates, 617 



mammals, 491,617,618 



man, 618 



reptiles, 617 

 Agclcnidae, 278 

 Agclenopsis, 278 

 Agglutination, 527 

 Agkistrodon, 426, 430 



Agnatha, 317, 324, 360-367 



(see Lamprey) 

 Aigrettes, 460 

 Air bladder, fish, 380 



cavities, bird, 435 



sacs, pigeon, 441 

 Alaudidae, 462 

 Albatross, 433, 452, 461 

 Albinism, 596 

 Albumen, bird's egg, 442, 443 



gland, 292 

 Albuminous coat, 477 

 Alcyonaria, 128 

 Aleyrodidae, 264 

 Allantois, 476, 477 

 Alleles, 575 



heterozygous, 575 



homozygous, 575 



multiple, 589, 590 

 Alligator, 407, 420, 430 



gar, 379 

 Alligatoridae, 407, 430 

 Allocapnia, 263 

 Alloeocoela, 147 

 Allotriognathida, 395 

 Alpine environment, 642 

 Altricial birds, 449, 450 

 Alula, 438 

 Alveolar duct, 537 

 Alveoli, 537 

 Ambergris, 493 

 Amblyopsidae, 379 

 Amblyopsis, 390 

 Ambulacral groove, 304, 307 



ossicle, 307 



plates, 309 

 Ambystoma, 400, 404 

 Ambystomidae, 397, 404 

 Aniciuridae, 379 

 American, alligator, 422 



bell toad, 397, 399 



chameleon. 415 



crocodile, 420, 422 



egrets, 460 



opposum, 481, 495 



ostrich, 461 



otter, 484 



691 



