568 



INDEX 



Anura, 12. 



Anus, 283, 313, 323, 398. 

 Aphaniptera, 375. 

 Aphid, 374, 388. 

 Ajris mellifica, 391. 

 Apoda, 12, 14, 39. 



Appendages, of Crustacea, 325, 326, 

 327, 334; of vertebrates, 39, 498, 

 600, 501. 



Aptera, 372. 



Arachnida, 241, 339, 340, 341. 



Arboroid colonies, 195, 196. 



Arcella, 155, 164. 



Archceopteryx, 519, 520. 



Archenteron, 398, 408, 429. 



Archi-annelida, 241, 309, 310. 



Area opaca, 427. 



Area pellucida, 427. 



Aristotle, 222, 322. 



Army-worm, 382. 



Artemia, 336. 



Arteries, 53, 56, 57. 



Arthropoda, 49, 246, 321; classifica- 

 tion of, 238, 240, 241, 338. 



Artifacts, in evolution, 535, 536, 537. 



Aseel, 523, 526. 



Asexual reproduction, 214, 218, 219; 

 see also Reproduction. 



Aspirigera, 189. 



Assimilation, 75, 76; in Hydi-a, 261; 

 in Protozoa, 161, 184; summary of, 

 93. 



Astacus, 322. 



Astarte, 503. 



Astasia, 167. 



Asteroidea, 241. 



Astral rays, 137. 



Astrangia danae, 280. 



Asymmetrical organisms, 244. 



Auchenia, 520. 



Aurelia, 278. 



Australopithecus africanus, 533. 



Autocatalysis, 74. 



Autogamy, see Endomixis. 



Autonomic nerves, 67. 



Autosome, 227, 229, 447. 



Aves, 11, 37, 241; see also Birds. 



Axon, 149, 298. 



Balanoglossus, 13, 36. 



Bateson, 479, 497, 564. 



Bdellodrilus, 329. 



Beaver, 26. 



Bees, 375, 390, 392; bumble, 391; 



honey, 391, 392. 

 Beetles, .see Coleoptera. 

 Behavior, 113, 318; of earthworm, 



301; of Hydra, 264; of locust, 360; 



of Protozoa, 158, 169, 179. 

 Berthold, 158. 

 Bilateral symmetry, 244. 

 Bile. 83. 

 Bile duct, 47. 

 Binary fission, see Cell division of 



Protozoa. 

 Biogenesis, 195, 202, 204. 

 Biological sciences, 1. 

 Biology, 2. 



Biometrical methods in genetics, 457. 

 Birds, 37, 425. 

 Bladder, urinary, 52. 

 Blastocoele, 407, 427. 

 Blastoderm, 422, 427. 

 Blastodisc, 426. 

 Blastopore, 307, 406, 408. 

 Blastostyle, 276. 

 Blast ula-stage, of Amphioxus, 399; 



of frog, 405, 406, 407. 

 Blepharoplast, 168. 

 Blood, cells of, 103, 145, 146; clotting 



of, 146; as common carrier, 105; 



plasma of, 103, 145; serum of, 146. 

 Bodo, 155. 



Body cavity, see Coelome. 

 Body plan, of Annulata, 314; of 



Arthropoda, 337; of Cctlenterata, 



260, 281; of Crustacea, 336; of 



earthworm, 308; of Hydra, 249; 



of Insecta, 376; of Vertebrata, 49; 



see also Internal Organization. 

 Body waU, 288, 290, 353. 

 Bone, 143. 

 Botany, 2. 



Bowman's capsule, 52, 95. 

 Brachiopoda, 241, 514. 

 Brachystola, 344. 

 Brain, of invertebrates, 289, 297, 358; 



