546 



IISTDEX 



Arteries, 72 (see circulatory system). 



Arthropoda, 147, 266 



Artificial selection, 106 



Artiodactyla, 454 



Ascaris, 200 



Ascidians, 313 



Asellus, 270 



Ass, 455 



Assimilation, 13 (see metabolism). 



Asterias, 208 



Asteroidea, 221 



Astragalinus, 427 



Astroid-stage, 24 (cell-division). 



Asymmetry, 93, 372 



Atrial pore, 314 



Atrium, 314 



Auditory nerve, 353 



Auditory organs, 82, 282, 355 



Auk, 414 



Aurelia, 186 



Autolytus, 230, 231 



Automatism, 12 



Aves, 399, 411 



Axiality, 92, 94 



Axial skeleton, 329 



Axon, 62 



Baboons, 460 

 Balanoglossus, 312, 313 

 Barbs (see feather). 

 Barbules (see feather). 

 Barnacles, 293 

 Bass (sea), '372 

 Bats, 458 

 Bears, 455 

 Beaver, 458 

 Bees, 123, 307 

 Beetles, 305 



Behavior (see sense organs, and sen- 

 sation). 

 Bibliography, 540 

 Bilateral symmetry, 96, 98 

 Binomial nomenclature, 520 

 Biogenetic law, 490 

 Bird lice, 300 

 Birds, 144 

 Bittern, 416 



Bivalent chromosomes, 33, 34, 36 

 Bivium, 213 

 Blastoidea, 220 



Blastomeres, 37 



Blastopore, 38, 40 



Blastula, 38, 40 



Blood, 58 



Boat-shell, 261 



Body-cavity (see coelom). 



Bojanus, organ of (= kidney of clam). 



Bondsa, 418 



Bone, 57 



Bony-fishes, 373 



Book-lungs, 282 



Bot-fly, 301 



Brachiopoda, 204 



Brain: orang, 468; Hottentot, 469; 

 Gauss, 469 



Brain (vertebrate), 348, 349 



Branchiae, 70 



Branchial arches, 340-342 (see circula- 

 tory system). 



Bronchi, 447 



Branchiostoma, 313, 314 



Brook trout, 369 



Bryozoa (see polyzoa, 203). 



Buccal cavity, 334 



Bugs, 300 



Bubo, 421, 422 



Bufo, 382 



Butorides, 415 



Butterflies, 303 



Cabbage butterfly, 304 



Cabbage worm, 304 



Csecum, 446 



Cambarus, 266 



Camel, 454 



Camera eye, 83, 358 



Campanularia, 186 



Campodea, 299 



Canine teeth, 444 



Canker-worm, 305 



Capillaries, 72, 340 



Caprella, 297 



Carapace — in Crustacea, 283 ; turtles, 393 



Carbohydrates, 11 



Cardinal veins, 365 (see circulatory 



system). 

 Cardium, 259 

 Carinatas, 413 

 Camivora, 451, 455 

 Carpels, 333 , 



