INDEX 



925 



AsUidae, family, 330 

 Asphalt pits of La Brea, 861 

 Aspidiotus perniciosus, 316. Sis 

 Ass, 633 

 Assimilation, 278 

 in Euglena, 81 

 in Hydra, 152 

 Astacus, 266 

 Aster, 62, 63 

 Aster ias, 228 



cleavage, 116 

 Asteroidea, class, 217, 226 

 Asteromeyenia, 121 

 AsLhma, 839 

 Astrangia, 142, 143 

 Astropecten, 218 

 Athermidae, family, 452 

 Atlas, 494 

 Atom, 697 

 Atomic weight, 697 

 Atrial cavity, 365, 370 

 Atrina seminuda, pinna shell, Mi 

 Atriopore, 370 

 Auidae, family. 296 

 Auditory meatus, 639 



nerve, 527 

 Audubon. John J.. 786 

 Auks, 591 

 Aurellia, 138 



lite cycle, 139 

 Australian region, 712 

 Autonomic function, 528 

 Autotomy, 219, 234, 281 

 Aves, class, 411, 582 

 classification, 584 

 economic relations, 596 

 Avicularia, 184. 185 

 Aviculariidae, family, 296 

 Avocets, 591 

 Avoiding reaction, 101 

 Axial gradient, 173 



skeleton, 378 

 Axoloil larva of Ambystoma tigrinum, 



481 

 Axone, 107 

 Aye-aye, 635 



Babesia bigemina, 80 

 Baboon, 636 

 Back cross, 827 

 swimmers, 318 

 Badgers, 627, 628 

 Bagre marina, 450 

 Bailer, 270 



Baker's mealy bug, 318 

 Balaena mysiicetus, right whale, 635 

 Balance in life, 32 



in nature, 31 

 Balanoglossida, order, 361 

 Balantidium coll. 70, 71, 744 

 Balanus, 265, 285 

 Baleen, 634 

 Balistidae family, 4o5 

 Barb, 599, 600 

 Barbary ape, 636 

 Barbels, 457 

 Barbule. 599. 600 

 Barnacle, 264 



acorn, 264 



goose, 264 

 Barnacles, 284 

 Barnea costata, 771 

 Barracudas, 453 

 Barriers to distribution, 717 

 Basal disc, 140. 146, 147 

 Basiliscus, 552 



Basipodite, 270 

 Basisphenoid bone, 465 

 Basket star, 219 

 Basommatophora, 258 

 Bass, freshwater, 454 

 Basses, eea, 454 

 Bat, brown, 620 



Mexican free-tailed, 620 

 Baihyal zone, 770 

 Bathymetric distribution, 713 

 Batoidei, order, 424 

 Batrachoididae, family, 455 

 Batrisodes, 340 

 Bais, vampire, 620 

 Bdellostoma, 412 

 Bears, 629, 791 

 Beaver, 624, 787 

 Beavers, 622 

 Beche-de-mer, 235 

 Bedbugs, 318 

 Bee hies, 330 

 Bees, 266, 331 



BeeJe, Colorado potato, 3J3 

 Beetles, 265, 322 

 ambrosia, 33 5 

 passalus, 335 

 Behavior, chain reflex, 851 

 habitual, 852 

 reflex, 850 

 tropistic, 849 

 Belfrage, G. W., 48 

 Belonidae, family, 451 

 Belostomatidae, family, 318 

 Benthos, 769 

 Beroe ovata, 157, 159 

 Bidder's organ, 542 

 Bighorn, 631 

 Billbugs, 324 

 Binary fission, 90 

 Biogenetic law, 870 

 Biological effects of radiations, 697 



point of view, 17 

 Biology, 17, 20 

 Biomes, 724 



Bios, 17 . „„„ 



Biotic communities, 723 



formations, 724 

 Biotin, 390 

 Bipes biporus, 555 

 Bipinnaria larva, 23 2, 234 

 Biramous appendages, 2(0 

 Bird migrations, 582 

 B.rds, 411, 582 



economic relations, 596 

 Birth rate, 839 



Bison amencanus, buffalo, bii 

 Bisons, 630 

 Bittern, 587 

 Bivium, 227, 228 

 Black bass, 453 



widow spider, 293 

 Blackbirds, 595 

 'Blasendarm," 190 

 Blastema, 688 

 Blastocoel, 210 



Blastocoele, 117, 534, 53o, 80o 

 Blastocyst, 814 

 Blastoderm, 805 

 Blastodermic vesicle, 814 

 Blastomeres, 171. 533, 800 

 Blastopore, 534. 805 

 Blastostyles, 132 

 Blastula. 117, 134, 155 

 earthworm, 210 

 of frog, 533 . 

 Blatella germanica, 315 

 Blattidae, family, 315 

 Blind cave salamander, 482 



