INDEX 



787 



Aphides, 632 



Aphis rosce, 618 



Aphrodite, 464 



Aphroditea, 463, 464 



Apical plate, of Trochosphere, 316 : of 

 Articulata, 363* 



Apical system of plates, 385, 389 



Apis mellificii, 622, 631, 636 



Aplacophora, 694*, 695, 696, 697, 698, 

 699, 700, 702, 781 



Aplysia, 718, 719, 720, 726 



Aplysiidce, 714 



Apoda (Holotliuroidea), 404*, 417, 419 



ApodidcB, 555, 556 



Apopyle, 109, 110, 111* 



Appendages, of Rotifera, 323 : Apus, 

 517, 518 : Astacus, 529, 530 : Crus- 

 tacea, 556 : Peripatns, 591 : Peri- 

 planela, 605, 606, 607 : Insecta, 623 : 

 Scorpion, 639, 640 



Apseudes, 553 



Apterygota, 615*, 661 



Aptychus, 772* 



APUS, 514 : External characters, 515, 

 516 : Appendages, 517, 518 : Body- 

 wall, 519 : Muscular system, 519 : 

 Digestive organs, 520, 521 : Body- 

 cavity, 521 : Circulatory system, 

 521 : Respiration, 522 : Renal 

 organ, 522 : Nervous system, 522, 

 523 : Organs of sense, 523, 524 : Re- 

 productive organs, 524 : Develop- 

 ment. 525 : Systematic position, 555 



Apus, 518, 521, 522, 524, 525 



Apus cancriformis, 515, 523 



Apus glacialis, 517 



Aquatic pupa, 635 



Arachnida, 515, 637*, 659. 663, 661, 

 662 : Example, 638 : Distinctive 

 characters and classification, 644 : 

 General organisation, 646 : External 

 form, 646-651 : Endosternite, 651 : 

 Coxal glands, 651 : Alimentary sys- 

 tem, 651 : Heart, 652 : Organs of 

 respiration, 652 : Nervous system, 

 653 : Sense organs, 653 : Repro- 

 ductive apparatus, 654 : Mode of 

 life, 655 : Geological history, 656 : 

 Appendix, 657 



Arachnidium, 649 



Araneida, 645*, 648, 651, 653, 656 



Arbacia punctulata, pedicellana, 413 



Area, 678, 679, 683, 685, 686, 688, 690, 

 693 



Arcella, 49 



Archceocyathince, 126 



Archseocytes, 123 



Archenteron, 24* 



Archi- Annelida, 42?, 491*, 492. 493, 

 511, 513 



Archi-cerebrurn, 542 : of Feriplaneta, 

 615 



Archi-Chsetopoda, 454* , 465 



Archidoris, 719 



Archigetes, 256, 258, 283 



Architeuthis, 779 



Argiope, 359 



Argonauta argo, 769, 772 



Argonauts, 767, 768, 769, 772 



Argulus, 551, 562, ~>r>:{ 



Arhynchobdellida, 504* 



Aristotle's lantern, 389* 



Ark-shell, 686 



Armadillidium, 572 



Arrow worms, 292 



Artemia, 549, 557 



Arthrobranchise, 538 



Arthropoda, 514* : Affinities of air 

 breathing, 661, 662 



Arthrostraca, 569*, 587 



Articulata, 359*, 360, 361, 362 : Shell, 

 360, 361 



Ascarida-, 299* 



ASCARIS LUMBRICOIDES, 292 : External 

 characters, 292 : Body-wall, 293 : 

 Digestive organs, 294, 295 : Body- 

 cavity, 295 : Excretory system, 296 ; 

 Nervous system, 296, 297 : Repro- 

 ductive organs, 296, 297 : Develop- 

 ment, 297 : Systematic position, 299 



Ascaris megalocephala, 292 



Ascaris suilla, 293 



Ascetta, 117 



Ascon, 118, 119* 



Ascopodaria, 347 



Asellus, 554, 569, 570 



Asexual reproduction, 41 : in Amoeba, 

 46 : Heliozoa, 61 : Radiolaria, 63 : 

 Euglena, 71 : Flagellata, 76 : 

 Choanoflagellata, 80 : Dinoflagellata, 

 81 : Cystoflagellata, 82 : Sporozoa, 

 83 : Gregarinida, 86 : Coccidiidea, 

 86 : Haemosporidea, 89 : Myxo- 

 sporidea, 90 : Paramxcium, 92 : 

 Ciliata, 99 : Tentaculifera, 103 : 

 Sponges, 122 : Actinozoa, 195 : 

 Platyhelminthes, 278 : Bugula, 339 : 

 Chsfitopoda, 475 



Aspergillum, (T/8, 683, 684 



Aspido branch ia, 713* 



Aspidochirotse, 406 



Aspidocotylea, 249*. 253, 267 



Aspidogaster, 279 



Asplanchna, 322, 323, 324 



Astacopsis, 555 



Astacus, 555 



ASTACUS FLUVTATILJS, 527, 535 : Ex- 

 ternal characters, 527 : Abdomen, 

 528, 534 : Thoracic region, 528 : 

 Head, 529 : Appendages, 529, 530 : 

 Articulations, 532 : Body -wall, 533 : 

 Muscular system, 533, 534 ' Diges- 

 tive organs, 535 : Respiratory 

 organs, 536, 53'/ : Excretory organs, 

 538, 539 : Circulatory organs, 539, 

 540, 541 : Nervous system, 541. 542 : 



