810 



INDEX 



Alpine forms, 8* 



Alternation of generations See Meta- 

 genesis. 



Alveolus, of .Sea-urchin, 397 



Ambulacral area, 395 



Ambulacral grooves, 376* 



Ambulacral ossicles, 378, 381, 419 



Ambulacral pores, 378, 396 



Ambulacral ridges, 380 



Ambulacral spines, 376, 387 



Ambulacral system, of Asteria*, 383 : 

 Echinus, 396, 399 : Sea-cucumber, 402, 

 403 : Antedon, 408 : Echinodermata, 

 415 



Amitotic division, 19* 



Ammonites, 790, 795, 803, 804 



Amnion, of Peripatus, 612 : Periplaneta, 

 631 : Scorpion, 659 



AMOEBA, 10, 11, 12, 13, 14: Pseudopods, 

 47 : Endosarc, 46 : Ectosarc, 46 : Con- 

 tractile vacuole, 46 : Encystation, 

 46 : Fission, 46 : Systematic position, 

 48 



Amcebidce, 48 



Amcebocytes, 382, 399 



Amcebophyra, 233 



Amoebula, of Didyminm, 66, 67 : of 

 Gregarina, 82, 83 



Amphiblastula, 124*, 125 



Amphidiscs, 121*, 122 



Amphilina, 262, 287 * 



Amphineura, 680, 712* : Distinctive char- 

 acters and classification, 712 : General 

 organisation, 713 : External features, 

 713, 714 : Ctenidia, 713 : Alimentary 

 system, 715 : Body cavity, 715 : Vas- 

 .cular system, 715 : Nervous system, 

 715, 717 : Reproductive and renal 

 organs, 718, 719 : Development, 718, 

 720: Ethology, distribution, &c., 

 720 



AmphinomidcK, 467 



Amphipoda, 568*, 583, 584, 585, 586, 593, 

 596, 603 



Amphiptyches, 262, 263 



Amphistomum, 257 



Amphitretus pelagicus, 794 



Amphiura, 232 



Amphiura squamata, 429 



Ampullae, 158*, 378*, 399 



Ampullaria, 749 



Amusium, 702, 704 



Anal filament, 663 



Anal glands, of Peripatus, 610 



Anal respiration, 596 



Anal spot, of Paramcccium, 90 



Anaspidacea, 566*, 581, 582, 596, 603 



AnaspidcK, 566 



Anatomy, 3* 



Anchors, 177 



Anguillula, 305 



Anisopoda, 584* 



Ankylostonw duodenale, 306 



Annulate, 439* : General remarks on, 

 523 : Relationships, 525 



Annuli of Leech, 506 



ANODONTA, 680 : Shell, 682 : Body, 684 : 

 Muscles, 684 : Ccelome, 684: Digestive 

 organs, 684, 685 : Gills, 685 ; Excretory 

 organs, 689 : Circulatory system, 689, 

 690 : Nervous systehi, 690 : Sensory 

 organs, 691 : Reproductive organs, 691 : 

 Development, 692, 693, 694: Syste- 

 matic position, 696 



Anodonta, 696, 697, 698, 704 



Anomia, 695, 697, 698 



Anomura, 569*, 588, 589 



Anopheles, 87 



Anoplophyra, 94 



Anostraca, 563*, 571 



AXTEDON K.OSACEA, 405 : General extern^ 

 features, 405, 406 : Ossicles, 40 

 Crelome, 407 : Enteric canal, 407 : 

 Ambulacral S3 7 stem, 408 : Nervou: 

 system, 408 : Perihsemal and h?emas 

 system, 409 : Sacculi, 409 : Reprorhicl 

 live organs, 409 : Metamorphosis, 409- 

 432, 433 : Systematic position, 414 : 

 Development, 432 



Antenna, of Astacus, 544 See also Ap- 

 pendages 



Antennary gland, of Astacus, 551, 552 



Antennary glands, 551 , 596 



Antennule, of Astacus, 544 See also 

 Appendages 



ANTHENEA FLAVESCENS, 384, 386, 387, 

 388 



Anthomedusse, 141*, 143, 144, 149 



Anthophysa, 576 



Anthosoma, 575, 576 



Anthura, 568 



Antimeres, 42* 415 



Antipatharia, 195*, 201, 202, 203, 204, 

 210 



Antipathes, 201 



Antispadix, 780 



Ant-lions, 633 



Ants, 636, 652 



Aorta See Vascular system 



Aphides, 647 



Aphis TOSH/, 633 



Aphrodite, 475 



Aphroditea, 474, 475 



Apical plate, of Trochosphere, 323 



Apical system of plates, 393, 397 



Apis mellifica, 637, 652 



Aplacophora, 713*, 715, 717, 718, 720, 

 721, 805 



Aplysia, 738, 739, 740, 746 



Aplysiidce, 734 



Apoda (Holothuroidea), 413*, 426, 428 



Apodiid(f, 569, 570* 



Apopyle, 108, 109, 110* 



Appendages, of Rotifera, 330 : Apus, 

 529, 530 : Astacus, 542, 543, 544 : Crus- 

 tacea, 570 : Peripatus, 607, 608 : Peri- 





