INDEX 



757 



Argonauta unto, 739, 742 



Argonauts, 736, T.'ls 



Anjnlux, 5-22, 531, 532 



Aristotle's lantern, 366 



Ark-shell, 653 



Armadillidium, 546 



Armailillo, 524, 546 



Armata, 455, 457, 458, 461 



Artemia, 521, 526 



Arthrobranchia;, 508 



Arthropoda, Classes. 4S4 ; Affinities of 

 air-breathing, 027 



Arthrostraca, 524*, 543, 547, 55U 



Articulata, 338* : Shell, 338 



ASI'ARIS LUMBKICOIDES, 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 



Ascaris iii<ir<}i-tiio*a, 286, 287 



A*f<tl<i primordial i, 107 



Ascon, 109 



A s< llus, 524, 543, 545 



Asexual reproduction, 38 : in Amoeba, 

 44 : Euglena, 64 : Flagellata, 69 : 

 Choanoflagellata, 73: Dinoflagellata, 

 74 : Sporozoa, 75 : Paramcecium, 81 : 

 Ciliata, 88 : Tentaculifera, 92 : Sponges, 

 112 : Actinozoa, 184: Platyhelminthes, 

 263 : Bugula, 319 : Chsetopoda, 446 



Asiphoniata, 647, 658 



Asperijillum, 647, 652, 653 



AspidobrancMa, 683 



A spidogaster, 264 



Asphai'rhna, 304, 305, 308 



Axtn<-r>i<]< .-,-, 523 



A xfiirux, 549 



ASTACUS FLUVIATILIS, 498 : External 

 characters, 499 : Abdomen, 499 : 

 Thoracic region, 499 : Head, 499 : 

 Appendages, 500, 501 : Articulations, 

 503: Body -wall, 504: Muscular system, 

 504, 505 : Digestive organs, 506 : Re- 

 spiratory organs, 507, 508 : Excretory 

 organs, 5(19, 510: Circulatory organs, 

 509, 512 : Nervous system, 513 . Sen- 

 sory organs, 513 : Reproduction, 514, 

 515 : Development, 515 ; Systematic 

 position, 525 



Axtaxiofixi*, 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 civlome, 351 : 

 Digestive system, 353: Ambulacral 

 system, 354 : Ovoid gland, 354 : Re- 

 productive system, 356 : Systematic 

 position, 380 



A*/<rina, 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 



Astftea, 185, 194 



A*troi>hytoii, 387 



Astrosphere, 16* 



Atlanta, peronii, 689 



Atrochal, 445 



Attraction-sphere, 16* 



Auditory organs, 37 



Aulactinium actinastrum, 60 



Aii/oxfoiiin, 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 



Auricvlewin, 372, 397, 398 



Aiitolytus cornittti*, 446 



Avicularium, 314, 315, 324 



Axes, 40* 



Axial fibre, 83 



Axial sinus, 355 



Axis-cylinder, 27, 28 



B 



B 



>ALANUS, 522, 534 

 Barnacles, 532, 548 

 Barrier reef, 197 

 Basal plate, of coral, 192*, 193 

 Bdelloida, 303* 

 ]!<l<lloura, 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 



Bifharzia hcematobium, 265 

 Binomial nomenclature, 1* 

 Biology, 1* 

 Bionomics, 9 

 /l/'/itiliiim, 240 

 Bipinnaria, 361, 397 

 Bird-lice, 602 



