788 



INDEX 



Sensory organs, 542 : Reproduction, 

 542, 543 : Development, 544, 545, 

 546, 547 : Systematic position, 556 



Astasiopsis, 73 



ASTERIAS RUBENS, 368 : General ex- 

 ternal features, 368, 369, 370 : Trans- 

 verse section of an arm, 370, 371 : 

 Vascular and nervous systems, 372 : 

 Structure of the disc, 373 : Body- 

 wall and coalome, 373 : Digestive 

 system, 374, 375 : Ambxilacral svs- 

 tem, 375, 376, 377 : Reproductive 

 system, 378, 379 : Systematic posi- 

 tion, 405 



Asteriidcr, 405* 



Asterina, development, 380, 381, 382, 

 383, 384, 385, 386 



Asterina gibbosa, 381, 382, 383, 385, 420, 

 423 



Asteroidea, Example, 368 : Develop- 

 ment, 380 : Distinctive characters 

 and classification, 402 : Apical sys- 

 tem, 409 : Modifications of form, 

 409, 410 : Ccelome, 416 : Ambula- 

 cral system, 416, 417 : Blood- 

 vascular system, 417, 418 : Haemal 

 system, 418 : Axial organ, 419 : 

 Enteric canal, 419, 420 : Nervous 

 system, 420 : Reproductive organs, 

 420, 421 : Development, 421 : 

 Ethology, 424, 425 



Asthenosoma, 412 



Astracoidea, 556* 



Astrcea, 195, 196, 204 



Astropecten, 410, 411 



Astrophyton, 412 



Astrosphere, 17, 18* 



Atlanta peronii, 721 



Atrium, 245, 339 



Atrochal, 474* 



Attraction -sphere, 19* 



Auditory organs, 39, 40, 630 



Aulactinium actinastrum, 64 



Aulostoma, 504, 510 



AURELIA AURiTA, 167 : External char- 

 acteristics, 168, 169 : Digestive 

 cavity and canal system, 169, 170 : 

 Cell-layers, 170: Gonads, 171: 

 Gastric filaments, 171 : Muscular 

 and nervous systems, 171, 172 : 

 Sense organs, 171, 172 : Develop- 

 ment and life-history, 172, 173, 174, 

 175 : Systematic position, 176 



Auricle, of heart, 37* 



Auricles, of Sea-urchin, 389 : of Cteno- 

 phora, 220* 



Auricidaria, 396, 404, 422, 423 



Australian region, 9* 



Autogamy, 51, 61 



Autolytus cornutus, 475 



Avicularium, 334, 335, 345* 



Axes, 42*, 43 



Axial fibre, 94, 98, 99 



Axial nerve, 400 

 Axial organ, 378, 392, 419, 421 

 Axial sinus, 373, 378 

 Axis-cylinder, 30*, 31 



B 



>ALANUS, 551, 563, 564, 565, 581 

 Barnacles, 3, 514, 551, 563, 564, 579, 



581 



Barrier reef, 207 



Basal plate, of coral, 202*, 203, 204 

 Bathyctena, 223 

 Bathynella, 553 

 Batteries, 161* 

 Bdelloida, 321*, 323, 327 

 Bdelloura, 279 

 Bear-animal exiles, 658, 659 

 Bee -parasites, 625, 636 

 Bees, 514, 602, 603, 621, 626, 631, 632, 



636, 637 



Beetles, 514, 602, 603, 620, 625 

 Belemnites, 767, 772, 780 

 Benthos, 8* 

 Berenice, 150 

 Beroe, 221, 223, 226 

 Beroida, 218*, 221 

 Bicellariidce, 341* 

 Bicellular glands, 485* 

 Bilateral symmetry, 42, 43* 

 Bile, 35* 



Bilharzia hcematobia, 280, 281 

 Bilharzia japonica, 280 

 Binomial nomenclature, 1* 

 Binucleata, 74 

 Biology, 1* 

 Bionomics, 9* 

 Bipalium, 251 

 Bipinnaria, 402, 423 

 Bird-lice, 636 

 Bird's-Head Coralline, 334 

 Birgus, 555, 575, 580, 589 

 Birth-opening, 242* 

 Bivium, 370, 407 : of Sea-cucumber, 393 

 Black coral, 193*, 198, 199, 207 

 Blastocoele, 24* 

 Blastoidea, 405*, 426, 428 

 Blastomeres, 23* 

 Blastopore, 24* 

 Blastosphere, 24* 

 Blastostyle, of Obelia, 130*. 131 : 



Leptolinse, 151 : Porpita, 165 

 Blastula, 24* 

 Blatta See Periplaneta 

 Blattidce, 621, 637 

 Blepharoblast, 72*, 74 

 Blood, 30*, 35* 

 Blood-corpuscles, 30 

 Blood -vascular system See Vascular 



system 



Blood-vessels, 35 

 Blow-flies, 620 



