INDEX 



757 



A ryonauta argo, 739, 742 



Argonauts, 736, 738 



Argulu*, 522, 531, 532 



Aristotle's lantern, 386 



Ark-shell, 653 



Armadillidiuyn, 546 



Armadillo, 524, 546 



Armata, 455, 457, 458, 461 



Artemia, 521, 526 



Arthrobranchiae, 508 



Arthropoda, Classes, 484; Affinities of 

 air-breathing, 627 



Arthrostraca. 524*, 543, 547, 550 



Articulata, 338* : Shell, 338 



ASCARIS LUMBRICOIDES, 275 : External 

 characters, 275 : Digestive organs, 278, 

 279 : Ccelome, 279 : Excretory system, 

 279: Nervous system, 279, 280: Re- 

 productive organs, 279, 281 : Develop- 

 ment, 280 : Systematic position, 

 282 



'/.s itt't/roi'enosa, 286, 287 

 primordiali* , 107 



Ascon, 109 



Asellus, 524, 543, 545 



Asexual reproduction, 38 : in Amoeba, 

 44 : Euglena, 64 : Flagellata, 69 : 

 Choanoflagellata, 73 : Dinoflagellata, 

 74 : Sporozoa, 75 : Paramoecium, 81 : 

 Ciliata, 88 : Tentaculifera, 92 : Sponges, 

 112: Actinozoa, 184: Platyhelminthes, 

 263 : Bugula, 319 : Chaetopoda, 446 



Asiphoniata, 647, 658 



Aspqrgilium, 647, 652, 653 



Aspidobranchia, 683 



Aspidogaster, 264 



AxiJanchna, 304, 305, 308 



A xtacoides, 523 



Astacus, 549 



ASTACUS FLUVIATILIS, 498 : External 

 characters, 499 : Abdomen, 499 : 

 Thoracic region, 499 : Head, 499 : 

 Appendages, 500, 501 : Articulations, 

 .~><>3 : Body-wall, 504: Muscular system, 

 504, 505 : Digestive organs, 506 : Re- 

 spiratory organs, 507, 508 : Excretory 

 organs, 509, 510 : Circulatory organs, 

 509, 512 : Nervous system, 513 . Sen- 

 sory organs, 513 : Reproduction, 514, 

 515 : Development, 515 ; Systematic 

 position, 525 



A Hfasiopsis, 66 



ASTERIAS RUBENS, 346 : General external 

 features, 346, 347, 348: Transverse 

 section of an arm, 349 : Vascular and 

 nervous systems, 350 : Structure of the 

 disc, 351 : Body-wall and ccelome, 351 : 

 Digestive system, 353 : Ambulacra! 

 system, 354 : Ovoid gland, 354 : Re- 

 productive system, 356 : Systematic 

 position, 380 



Axterina, development, 358, 359, 380, 

 361, 362 



Asteroidea, Example, 346 : Development, 

 358 : Distinctive characters and classi- 

 fication, 378 : Apical system, 384 : 

 Modifications of form, 384 : Ccelome, 

 392 : Ambulacral system, 393 : Blood- 

 vascular system, 394 : Enteric canal, 

 394 : Nervous system, 395 : Repro- 

 ductive organs, 395 : Development, 

 397 : Ethology, 399 



Axft'tm, 185, 194 



Astrophyton, 387 



Astrosphere, 16* 



Atlanta peronii, 689 



Atrochal, 445 



Attraction-sphere, 16* 



Auditory organs, 37 



Aulactinium actinastrum, 60 



Aulostoma, 476, 481 



AURELIA AURITA, External character- 

 istics, 156, 157 : Digestive-cavity and 

 canal system, 158, 159: Cell-layers', 

 158 : Gonads, 158 : Muscular and 

 nervous systems, 160 : Sense-organs, 

 160 : Development and life-history, 

 160, 161, 162, 163: Systematic posi- 

 tion, 164 



Auricle, of heart, 34 



Auricles, of sea-urchin, 366 



Auricularia, 372, 397, 398 



AutoJytus corn ut it*, 446 



Avicularium, 314, 315, 324 



Axes, 40* 



Axial fibre, 83 



Axial sinus, 355 



Axis-cylinder, 27, 28 



B 



B 



>ALANTJS, 522, 534 

 Barnacles, 532, 548 

 Barrier reef, 197 

 Basal plate, of coral, 192*, 193 

 Bdelloida, 303* 

 Bdelloiira, 264 

 Bear-animalcules, 626 

 Bee-parasites, 602 

 Bees, 587, 589, 598, 603 

 Beetles, 587, 591 

 Belemnites, 736, 742 

 Benthos, 8 

 Berenice, 139 

 Beroe, 211 : Section, 214 

 Beroida, 208, 211 

 Bilateral symmetry, 39*, 41 

 Bile, 32 



Bilharzia hcematobium, 265 

 Binomial nomenclature, 1* 

 Biology, 1* 

 Bionomics, 9 

 Bipaliwn, 240 

 Bipinnaria, 361, 397 ' 

 Bird-lice, 602 



