528 



INDEX 



Arachnida, 395 



parasitic, 439 

 Arachnoidea, 395 

 Arbacia, 361 

 Arboroid colony, 277 

 Arcella, 270 



Archaeopteryx, 487, 498 

 Archenteron, 100, 215 

 Archiannelida, 355 

 Argulus, 394, 412 

 Aristotle, 31 

 Aristotle's lantern, 360 

 Armadillidum, 411 

 Artemia, 412 

 Arteries, afferent branchial, 156 



of rat, 127 

 Arthrobranchiae, 400 

 Arthropod parasites, 431 

 Arthropoda, 23, 393, 415 



parasitic, 439 



phylogenetic advances of, 414 

 Arthropodial membrane, 397 

 Ascaridia, 335 



Ascaris, 23, 335, 337, 420, 438 

 Ascaroidea, 335 

 Ascorbic acid, 175 

 Asellus, 411 

 Aspidocotylea, 324 

 Assimilation, 27 



in Amoeba, 288 

 Asterias, 359, 364 



cleavage, 213 

 Asteroidea, 358 

 Astrangia, 310 

 Astropecten, 359 

 Atmosphere, 459 

 Atriopore, 154 

 Atrium, 219, 220 

 Attributes of life, 24 

 Auditory capsule of frog, 94 



meatus, 109 



nerve, 137 



vesicle, 220 

 Aurellia, 308 

 Auricles, 126 



Auriculo- ventricular aperture, 77 

 Australian region, 473 

 Autonomic nerves, 93 

 Autotomy, 359, 371 



in crayfish, 409 

 Aves, 148 



Avoiding reaction, 285 

 Axial gradient, 225, 326, 333 



skeleton of frog, 83 

 Axone, 57 

 Axons, 137 



Babesia, 437 

 bigemina, 281 



4fi 



Back cross, 241 

 Balance in nature, 24, 25 

 Balanoglossus, 148 



in evolution, 484, 485 

 Balantidium, 437, 438 

 coli, 272, 273, 437 

 Bali island, 473 

 Band worms, 324 

 Barnacle, 394, 412 

 Barriers, 22, 478, 498 

 Basipodite, 397 

 Basisphenoid, 110 

 Basket star, 359 

 Bass, 148 



Bathymetric distribution, 456, 472, 474 

 Beagle, the ship, 507 

 Beche-de-mer, 371 

 Beetle, Japanese, 26 

 Behavior, Amoeba, 291 

 Belfrage, 38 

 Beri-beri, 175 

 Bile, 173 



duct, 125 

 Binary fission in Amoeba. 290, 291 

 Binomial nomenclature, 35 



system, 259 

 Biogenetic law, 224, 413 

 Biological sciences, IS 

 Biome, 462 

 Biotic formations, 462 



regions, map, 463 

 Biotin, 175 

 Bipinnaria, 368 

 Birth rate, 253 

 Bivalve, 374 

 Bivium, 363 



Bladder worm, 324, 454, 456 

 Blastocoele, 99 

 Blastomeres, 98 

 Blastopore, 99 

 Blastula, 213 



of frog, 99 



of hydra, 321 

 Bleeders, 180 

 Blending inheritance, 244 

 Blind spot, 186 

 Blood, coagulation of, 180 



cells, characteristics, 179 



matching and evolution, 505 

 Body form, 216 

 Boll, Jacob, 38 

 Bonellia, 196, 356 

 Bot fly, 440 

 Bothriocephaloidea, 324 

 Bowman's capsule, 140 

 Brachial plexus, 93 

 Brachiolarian larva, 368 

 Brachiopoda, 24 

 Brachium, 109 

 Brachypephus, 416 



