704 



Aqueous humor, 398 

 Arhacia. See Sea urchin 

 Arcella, 128 

 Archaeoptenjx, 334 

 Archenteron, 564 

 Archeozoic (era), 625 

 Aristotle, 5. 560, 649 

 Aristotle's lantern, 277 

 Arteries, frog, 314, 316 



man, 494, 495, 497 

 Arterioles, 316 

 Arthropoda, 200-251 

 fresh-water, 204 

 marine, 204 

 Artiodactyla, 344 

 Ascaiis lumbricoides, 177, 178 

 Ascon, 140 



Ascorbic acid, 471, 472 

 Asterias vulgaris. See Starfish 

 Astigmatism, 402, 613 

 Astral rays, 552, 553, 554 

 Astrangia, 156 

 Atabrine, 134 

 Ataxia, 613 

 Ateles paniscus, 352 

 Atlas, 305 

 Atoll, 157 

 Atoms, 24, 25, 26 

 number, 28 

 tagged, 27 

 weight, 28 

 Auditory nerve, 307 

 Aurelia, 151, 158 



Auricle, 230, 231, 258, 259, 497, 498, 499 

 Auricular-ventricular node, 500 

 Auricular-ventricular valve, 313 

 Australopithecus, 355 

 Autonomic nervous system, 425-429 

 Autosome, 601 



Autotomy, 183, 216, 217, 271 

 Aves, 279 



Avoiding reaction, 117 

 Axial gradient theory, 576 

 Axolotl, 296, 297 

 Axon, 74, 75, 411 



B-complex, 471 



Back cross, one-gene, 590, 591 



two-gene, 594 

 Bacteria, 33 



Balance, sense of, 408-410 

 Balanus tintinnabulum, 206 

 Balbiani, 585 

 Banting, Frederick, 436 

 Barnacle, acorn, 204, 206, 262 



goose, 204, 206 

 Barth, L. G., 575 

 Base, 29 



Basilar membrane, 406 

 Basket star, 275, 276 

 Bat, 346 

 Bdellura, 95, 96 

 Beadle, G. W., 586 



INDEX 



Beagle, 651 



Bear, 342 



Beaumont, Dr. William, 458, 459 



Beaver, 346 



Bee bread, 234 



Beede, diving, 239 



potato, 239 

 Bends. See Decompression sickness 

 Biceps brachii, 385 

 Biceps femoris, 386 

 Bile, 312, 461, 462 

 pigment, 462 

 salts, 462 

 Bile duct, 311, 312, 453, 462, 465 

 Bilirubin, 462 

 Biliverdin, 462 

 Binary fission, 112, 119 

 Biochemistry, comparative, 640 

 Biogenesis, 29 

 Biogenetic Law, 632, 633 

 Bioluminescence, 430, 431, 432 

 Biome, 98 



Bipinnaria, 274, 282, 283 

 Bird, 331-335 

 first, 334 

 wingless, 334 

 Birth, human, 545, 546 

 Bivium, 270 



Black widow spider, 248, 249 

 Bladder, urinary, 317, 318, 319, 523, 524 



gall, 311, 453, 462 

 Bladderworm, 171 

 Blastema, 577 

 Blastocoel, 139, 148 

 Blastopore, 562, 564 

 Blastostyle, 149, 150 

 Blastula, 139, 148, 562, 563 

 Blending, 594, 595 

 Blood, 492, 504-517 



clotting (coagulation), 506-507 

 types, 510-513, 596 

 Blood pressure, 502, 503, 504 

 Blue baby, 547 

 Boar, skull, 667 

 Boderia, 128, 129 

 Body defense, 513 

 Bone, 71, 72 

 dermal, 306 

 replacement, 306 

 Bony fish, 291-294 

 Bowman's capsule, 525 

 Brachiation, 353 

 Brachydactylism, 613 

 Braconid, 243 



Brain, 75, 164, 226, 227, 278, 307-310 

 fore-, 420 

 hind-, 420 

 mid-, 420 

 Branchiostoma californiensis. See Amphioxus 

 Breathing center, 483, 484 



control of, 483-485 

 Breathing systems, crayfish, 212, 213 

 earthworm, 194 

 frog, 316-318 



