INDEX 



693 



Aphislion, 255,260 

 Apidae, 265 

 Aplacophora, 282, 300 

 Aplvsia, 295 

 Apoda, 396, 397, 404 

 Apodiformes, 462 

 Apopyle, 95, 96 

 Appendages, 90 

 arthropoda, 197 

 crayfish. 203, 205 

 Appendicular skeleton, 344. 345, 



501 

 Appendix, 515, 517 

 Apposition image, 209, 210 

 Apteria, 435, 436 

 Apterygiformes, 433, 461 

 Apteryx, 461 

 Aquatic, animals, 564 

 birds, 451 

 carnivores, 486 

 insects, 263 

 Aqueduct of Sylvius, 351 

 Aqueous humor, 550 

 Arachnida, 277 

 Arachnoidea, 198, 267-2S0 

 classification, 277-279 

 relations to man, 275-277 

 Araneae, 268, 277 

 Araneidae, 278 

 Arbacia, 309 

 Arboreal animals, 6 

 Arcella, 39, 40, 498 

 Archaeopteryx, 456, 457 

 Archaeornis, 444, 456, 457 

 Archaeornithes, 456 

 Archenteron, 82, 565 

 Archeocy tes, 9 5 

 Archeozoic period, 617 

 Archiannelida, 171, 188, 196 

 Arctic fox, 486 

 Arctiidae, 264 

 ATdea, 461 

 Arenicola, 171, 194 

 Areola, 201 

 Argasidae, 279 

 Argiope, 278 

 Anon, 301 

 Aristotle, 652 

 Aristotle's lantern, 309 

 Arizona coral snake, 423. 425 



king snake, 421 

 Armadillo, 464, 485, 496 

 Army worm, 258 

 Arrow worm, 167. 168 

 Artemia, 27 

 Arteries, 320 



abdominal, 202, 207 

 antennary, 202, 207 

 frog, 336, 338 

 gastric, 207 

 hepatic, 207 

 leg, 208 

 man. 532, 533 

 ophthalmic. 202, 206 



Arteries [Cont.) : 



sternal, 202, 207, 208 



thoracic, ventral, 202, 207 



ventral, 208 

 Arterioles, 531 

 Arteriosclerosis, 530 

 Arthrobranchs, 208 

 Arthropod, 607 

 Arthropoda, 2, 3, 197-280, 607 



appendages, 197 



bilateral symmetry, 197 



body wall, 200 



characteristics, 224 



exoskeleton, 197 



nervous system, 197 



origin and relations, 218 



reproduction, 224 

 Articular, cartilage, 503 



process, 502 

 Artiodactyla, 464, 484, 496 

 Ascaphidae, 397 

 Ascariasis, 155 

 Ascaris, 149-153, 150, 155, 161 



anatomy, 150, 151, 152 



excretory system, 150, 151 



digestive tract, 151, 152 



intestinal tract, 152 



reproduction, 150, 151, 152 

 Ascaroidea, 161 

 Aschelminthes, 161 

 Ascon, 94, 96 

 Asconosa, 100 

 Ascorbic acid, 523 

 Asexual reproduction, 79, 103, 



122 

 Asiatic, elephant, 487 



land salamander, 397 

 Asilidae, 265 

 Asplanchna, 166 

 Ass, 491 

 Assimilation, 19 

 Association area, brain, 547 



neurons, 544, 556 

 Astacus, 198, 207 



Asterias, 503-308, 31 3 



Asteroidea, 304, 31 3 



Astragalus, 343, 346, 348, 476 



Astrangia, 128 



Asymmetry, 88 



Ateleopida, 395 



Atelcs, 490 



Atlas, vertebra, 343, 437 



Atolls, 126, 127 



Atom, 17 



Atrial cavity, 323 



Atriopore, 317. 318 



Atrioventricular valves, 336 



Atrium, 318, 319, 330, 336, 530, 



533 

 Auditory, apparatus, 548, 549 



canal. 549 



capsule. 355 



nerve, 351, 353, 546, 549 



Auditory (Cont.) : 



organs, 238 



sac, 233 



vesicle, 566 

 Augustinian monastary garden, 580 

 Auk, 452, 461 

 Aurellia, 117, 121, 122 



life cycle, 122 

 Auricle, 246 

 Auricularis, 356 

 Aurochs, 491 

 Australian ladybird beetle, 255 



realm, 650 



"teddy bear," 483 

 Australopithecus, 624, 625 

 Autecology, 633 

 Autolytus, 187 

 Autonomic ganglion, 351 



nerve trunk, 351 



nervous system, 350, 352, 354, 

 544 

 Autosome, 585 



Autotomv, 212, 508, 311, 560 

 Aves, 317, 325,432-462 



(see Bird and Pigeon) 

 Avoiding reaction, 60 

 Axial, filament. 43 



gradients, 1 36 



rod, 434, 435 



skeleton, 344, 501 

 Axolotl, 400 

 Axon, 353 



terminal branches, 353 

 Aye-aye, 488 

 Azygos, 470 



B 



Babesia, 74 

 Baboon, 464, 489, 495 

 Back swimmer, 263 

 Baird's tapir, 496 

 Balanced aquarium, 644 

 Balancers, 244 

 Balantidium, 64, 73 

 Balanus, 216 

 Baldeaglc, 453, 455,461 

 Ball and socket joints, 504 

 Barb. 434, 435 

 Barbarv ape, 490 

 Barbet', 462 

 Barbulc. 434. 435 

 Barn owl, 433,45 3 



swallow, 433 

 Barnacle. 216 

 Barrier. 649 

 Barrier reef, 124, 126 

 Basal, disk. 103, 106,112, 123 

 Basal membrane. 179 

 Basement membrane, 105, 7.00, 



230 

 Basipodite, 208 

 Basket stars, 509 



