618 



ANIMAL BIOLOGY 



Basal disc, 136, 137, 141 



Basal granules, 494 



Basal metabolism, 493 



Basal plate, 148 



Basement membrane, 99, 260, 261, 465 



Bases, 8 



Basis of classification, 572 



Basket stars, 206 



Bats, 63, 432, 434, 435 



wing, 53 

 Beach fleas, 267 

 Beaks, 386, 403, 412, 414 

 Bears, 436, 445, 535 



foot, 435 

 Beasts, 424 

 Beavers, 437, 535 



skull, 426 

 B6che-de-mer, 211 

 Bedbug, 275, 289 

 Bee milk, 297 

 Beebread, 297 

 Bees, 278, 296-300, 483, 491, 522, 572 



proboscis, 278 

 Beetles, 276, 290, 294, 513 

 Behavior, 55-57, 497-304, 507, 521, 529-531 



ameba, 66-67 



amphibia, 376-377 



amphioxus, 321 



annelids, 252 



arthropods, 273, 311 



birds, 410-411, 419 



chromosomes in maturation and fertilization, 

 556 



coelenterates, 151 



crayfish, 262 



Crustacea, 269 



earthworm, 239 



eohinoderms, 210 



fishes, 354, 360, 364 



hydra, 141 



insects, 295-298, 300 



lampreys, 342 



mammals, 443 



modes of, 502 



mollusks, 229 



mussels, 217, 219-220 



Paramecium, 72-74 



parasites, 177 



planaria, 164-165 



spiders, 305 



sponges, 133 



starfish, 200-201 

 Belly, muscle, 471 

 Benthos, 511 

 Bible, 26 

 Bichat, 582 

 Bighorn, 535 



Bilateral symmetry, 52, 157, 166, 576 

 Bile, 329 

 Bile duct, 323 

 Binary division, 67 



Binomial nomenclature, 59-60, 572, 573 

 Biogenesis, 270 

 Biogenetic law, 270, 333, 543, 583 



Biogenetic series, 270-272, 325, 331-333, 366. 



466, 547, 548 

 Biology, 6, 41 



origin of word, 545 

 Biota, 505 

 Biotic factors, 507 

 Biotic succession, 508^510 

 Bioarental reproduction, 107 

 Bioinnaria, 201, 210 

 Bipinnaria larva, 200 

 Biradial symmetry, 157, 576 

 Biramous appendages, 256, 265 

 Birds, 63, 113, 294, 314, 340, 382-385, 403-423, 

 460, 466, 470, 476, 478, 484, 503, 521, 523, 

 530, 533-535, 537, 543, 567 



beaks, 412 



branchial arches, 366 



colors, 416 



feet, 413 



lung, 469 



wing, 53 

 Birds of paradise, 416 

 Birth, 447 

 Bisexuality, 107 



(See also Diecious animals) 

 Bisons, 535 



American, 440, 530, 535, 537 

 Biting lice, 288 

 Bittern, 509 



beak, 412 

 Bivalve molluscs, 221 

 Bivium, 203 



Black widow spider, 306 

 Bladder, air, 350, 352, 354-355 



gall, 329 



swim, 354 



urinary, 330 

 Bladder worm, 177 



Blastocoel, 121-125, 142, 378, 444, 477 

 Blastoderm, 121, 122, 125, 142, 164, 263, 361, 



362, 383, 477 

 Blastoids, 541 



Blastomeres, 120-124, 164, 361, 378, 477 

 Blastopore, 121, 122, 378 

 Blastula, 121-125, 142, 151, 152, 201, 378, 444, 



477 

 Blepharoplast, 79 

 Blind spot, 339 

 Blind worms, 374 

 Blister beetles, 287 

 Blood, 101, 216, 235, 236, 281, 330, 490, .520 



corpuscles, 31, 236, 322, 330, 490, 581 



plasma, 236, 322, 330, 490 



platelets, 330 



pressure, 490, 492 



serum, 330, 519 



vessels, 326 

 Blood-vascular system, 469, 490 



nemertines, 186 



(See also Circulatory system) 

 Blowing, of whales, 443 

 Boa constrictor, 393 

 Body, fighting disease, 518 



self-regulation, 517 



