730 



Artery, renal, 329, 373, 449 



segmental, 410 



spermatic, 373 



spiracular, 329 



stapedial, 373, 597 



sternal, of crayfish, 206 



subclavian, 329, 373, 410, 449 



suprabranchial, 306 



systemic, 601 



ventral abdominal, of crayfish, 

 206 

 thoracic, of crayfish, 206 



vesical, 449 



vitelline, 659. See also Aorta, 

 Aortic arches 

 Arthrobranchiae, 210 

 Arthropod, 195, 218 

 Arthropodin, 226 

 Articular process, 430 

 Articulation, 319, 421 

 Artiodactyla, 492, 557, 579 



Ascaris, 134, 143, 154. ^55 



alimentary canal of, 137 



body wall, 136 



excretory organs of, 136 



generative organs of, 138 



infective larvae of, 140 



lumbricoides, 134, 135 



megalocephala, 134 



suillcB, 134, 135 



muscle fibres of, 138 



nervous system of, 137 

 Ascon, 85 



Asexual reproduction. See Re- 

 production, asexual 

 Assimilation, 7, 10 

 Astacus pallipes, 195. See also 



Crayfish 

 Aster las rubens, 286. See also 



Starfish 

 Asteroidea, 297 

 Astral rays, 502 

 Atlas, 351, 424 

 Atriopore, 300 

 Atrium of lancelet, 300 

 Atrium = auricle, 325. See Heart 

 Atropas, 250 



Auditory capsules, 316, 353, 404, 

 425, 427, 428, 573, 576 



organs. See Ear 



ossicles, 586 

 Aulostomum, 186 

 Aurelia, 112, 113, 114 

 Auricle, 325. See Heart 

 Autogamy, 55 

 Automatism, 7 



in Amoeba, 29 



in Paramecium, 50 



INDEX 



Autonomic system, 388, 458, 463, 

 613. See also Sympathetic 

 system 



Autotomy, 45, 203 



Autosomes, 701 



Autostylic, 583 



Aves. 550 



Avoiding reaction, 51 



Axial organ of starfish, 289, 293 



Axis cylinder, 512 



of the body, factors in ovum 



determining, 675 

 vertebra, 424 



Axon, 511 



Backbone. See Vertebrae 

 Bacteria, 24, 260 



role of, in digestion, 445, 491, 492 

 Bacteroids, 235 

 Badger, 489 

 Balcenoptera, 486, 487 

 Balance of nature, 23 

 Balancers, 245 

 Balanoglossus, 309, 551 

 Balantidium coli, 77 



entozoon, 60 

 Balanus, 221 

 Baleen, 486 

 Barbicels, 395 

 Barbs of feather, 395 

 Barbules, 395 

 Barnacle, 221 

 Bars, gill and tongue, of lancelet, 



303 

 Basal granule, 48, 65 



Basal metabolic rate, 470 



Basal nucleus, 610 



Basement membrane, 517 



Basilar membrane, 469 



Basipodite, 197 



Basipterygium, 321 



Bastard wing, 394, 395 



Bat, wing of, 718 



Bateson, W., 683, 696 



Bath sponge, 87 



Bats, 477, 559 



Bdello stoma, 615 



Beak, 393, 404 



Beans, 252 



Bears, 488 



Beaver, 485, 486 



Bed bug, 148, 245, 251 



Bees, 147, 244, 245, 260 



Beetles, 240, 245, 247, 260 



Behaviour of Amoeba, 30 



of Hydra, 97 



of Paramecium, 50 

 Bell animalcules, 56 



