694 



Index 



Asexual reproduction, 252, 253 

 binary fission, 252, 351, 369 

 budding, 252, 351, 387, 388 

 multiple fission, 252, 351 

 regeneration, 253 

 transverse fission, 449 



Association, 653, 657, 659 



Association neuron, 195, 209 



Associes, 657, 658, 659 



Astacus, 502, 507 



Aster, 271 



Asterias, 544-549 

 anatomy, 544-547 

 biology, 548-549 

 life history, 547-548 



Asteroidea, 544-549 



Asthma, 234 



Astigmatism, 219 



Astragulus bone, 110 



Astral rays, 271 



Asymmetrical animal, 345 



Ateles, 635 



Atlas, 105 



Atom, 25 



Atomic number, 26 

 weight, 26 



Atrial cavity, 562, 565 

 pore, 564, 566 



Atrium of heart (sec Auricle) 



Auditory mechanism, 220-223 



Auditory nerve, 200, 205 



Augmentation, 206 



Auk, 625 



Aurellia, 386, 394-395 



Auricle of heart, 63, 161, 162, 163, 165 

 171, 172, 193, 214 



Auricular-ventricular node, 172 

 valve, 63, 163 



Auricularia, 550, 552 

 Australopithecus, 641 

 Autogamy, 370 



Autonomic nervous system, 194 206- 

 207 

 of frog, 69, 71 

 ganglia, 204 

 Autosome, 308 

 Autotomy, 505 

 Autotrophic, 321 

 Aves, 46, 567, 614-625 (sec also Bird) 



characteristics. 615-617 



orders, 623-625 

 Avicularium, 483 

 Axial gradient theory, 408 



skeleton, 55-57, 100-108 

 Axis, 106 



of egg, 293 

 Axolotl, 231, 597 

 Axon, 194 



Axopod, 362 

 Azygos vein, 168 



B 



Babesia, 367 

 Baboon, 635 

 Backbone (see vertebral column), 57, 



104-105, 566 

 Backswimmer, 539 

 Bacon, Roger, 265 

 Balance, 221, 223, 224 

 Balantidium, 373 

 Balanus, 489, 507 

 Barbet, 625 



Barnacle, 489, 506-507, 508 

 Barriers, 337-338 



Basal body (see blepharoplast), 353 

 Basal disc of hydra, 387, 388 

 Base, 29, 30 



Basilar membrane, 222, 223 

 Basipodite, 495 

 Basket star (see Gorgonocephalus), 



544, 549, 553 

 Basking shark, 576, 580 

 Basophil, 177, 178 

 Bat, 78, 256, 264, 628, 630, 632. 634 

 Bath sponge (see Spongia), 379, 381 

 Batoidea, 576 

 Bdelloura, 409 

 Beaded lizard, 607 

 Beagle, voyage of, 322 

 Bear, 638 



Beaver, 85, 630, 637 

 Bedbug, 536. 539 

 Bee, 518, 530, 531, 534, 535, 539 

 Beef tapeworm (sec Taenia saginata), 



418 

 Beetle, 536, 539 



as intermediate host, 445 

 Behavior, bird, 617, 620-621 

 frog, 48-51, 73 



sex, 240, 241, 242, 250, 254. 513 

 Bell toad (sec Ascaphus), 596, 601 

 Benthos, 660 

 Beriberi, 146 

 Bichat, 266 



Bichir. 569, 582, 589, 590 

 Bicuspid valve, 162, 163, 164 

 Bilateral symmetry, 345. 402 

 Bilaterality, origin of, 645 

 Bilateria, 347, 401 

 Bile, 137, 138 

 duct, 62, 137 

 pigments. 139, 177 

 salts, 138 

 Bilharziasis, 415 

 Bill of birds, 616. 617. 618, 619 

 Binary fission, 252, 351, 369 

 Binomial nomenclature, 42 



