534 



INDEX 



Archenteron, 39-40 



Archipterygium, 360 



Ardea, 414 



Argonauta, 263 



Aristotle's lantern, 210 



Armadillo, 451 



Army- worm, 404 



Arterial arches, 338 



Ateries, 7i_(see circulatory system). 



Arthropoda, 145, 265 



Artificial selection, 104 



Artiodactyla, 453 



Ascaris, 199 o 



Ascidians, 312 



Asellus, 269 



Ass, 454 



Assimilation, 13 (see metabolism). 



Asterias, 207 



Asteroidea, 220 



Astroid-stage, 24 (cell- division). 



Asymmetry, 92, 371 



Atrial pore, 313 



Atrium, 313 



Auditory nerve, 352 



Auditory organs, 81, 281, 354 



Auk, 413 



Aurelia, 185 



Autolytus, 229, 230 



Automatism, 12 



Aves, 398, 410 



Axiality, 91, 93 



Axial skeleton, 328 



Axon, 6 1 



Baboons, 459 

 Balanoglossus, 311, 312 

 Barbs (see feather). 

 Barbules (see feather). 

 Barnacles, 292 

 Bass (sea), 371 

 Bats, 457 

 Bears, 454 

 Beaver, 457 

 Bees, 121, 306 

 Beetles, 304 



Behavior (see sense organs, and sen- 

 sation) . 



Bibliography, 530 

 Bilateral symmetry, 95, 97 



Binomial nomenclature, 510 



Biogenetic law, 484 



Biographical zoology, 508 



Bird lice, 299 



Birds, 142 



Bittern, 415 



Bivalent chromosomes, 33, 34, 36 



Bivium, 212 



Blastoidea, 219 



Blastomeres, 36 



Blastopore, 38, 39 



Blastula, 38, 39 



Blood, 57 



Boat-shell, 260 



Body-cavity (see ccelom). 



Bojanus, organ of (= kidney of clam). 



Bonasa, 417 



Bone, 56 



Bony-fishes, 372 



Book-lungs, 281 



Bot-fly, 300 



Bothriocephalus, 204, 206 



Brachiopoda, 203 



Brain: orang, 467; Hottentot, 468; 

 Gauss, 468 



Brain (vertebrate), 347, 348 



Branchiae, 69 



Branchial arches, 339-341 (see circula- 

 tory system). 



Bronchi, 446 



Brook trout, 368 



Bryozoa (see polyzoa, 202). 



Buccal cavity, 333 



Bugs, 299 



Bubo, 420, 421 



Bufo, 381 



Butterflies, 302 



Cabbage butterfly, 303 

 Cabbage worm, 303 

 Caecum, 445 

 Cambarus, 265 

 Camel, 453 

 Camera eye, 82, 357 

 Campanularia, 185 

 Camp odea, 298 

 Canine teeth, 443 

 Canker-worm, 304 

 Capillaries, 71, 339 



