INDEX 
The names of Genera are printed in Italics. 
ABDOMINALIA, 278 
Acanthia, 364 
Acanthiidae, 364 
Acanthocystis, 18 
Acanthodrilus, 145, 147, 
149 
Acanthometra, 21 
Acarina, 419 
Acetabulifera, 210 
Achaeta, 159 
Acherontia, 354 
Acineta, 32, 33 
Acinetaria, 32 
Acoela, 88, 89, 93 
Acoelomata, 36, 47 
Acontia, 67 
Acridiidae, 337 
Acridium, 339, 342 
Actinia, 64, 67, 68 
Actiniaria, 68 
Actinophrys, 17, 18 
Actinopoda, 251 
Actinosphaerium, 18, 19 
Actinozoa, 47, 61, 63, 
278 
Aculeata, 380 
Adamsia, 67 
Adradii, 61 
Aegir, 64 
Aeolosoma, 144, 150 
Aethalium, 9 
Agelena, 412, 416 
Agelenidae, 416 
Agrion, 347 
Agrotidae, 353 
Akrostoma, 122 
Alcippe, 278 
Alcyionidae, 73 
Alcyonaria, 64, 71 
Alcyonidium, 185 
Alcyonium, 73 
Alloiocoela, 94 
Alpheus, 290 
Alphidius, 380 
Alternation of generations, 
47, 81, 102, 104, 158, 
364, 448 
Alucita, 351 
Alula, 370 
Amaurobius, 413 
Ambulacra, 225, 241, 246 
Ammonitidae, 222 
Amoeba, 5, 9, 10 
Amoebula, 8 
Amphilina, 104, 105 
Amphipoda, 290 
Amphiptyches, 104 
Amphiura, 235 
Ampullaria, 288 
Anal respiration, 268, 347 
Anceus, 290 
Andricus, 379 
Androctonus, 395, 398 
Anguillulidae, 128 
Animal kingdom, 2 
Anisopleura, 196 
Anisopoda, 297 
Annelids, 34 
Anobothrium, 105 
Anodonta, 110, 190, 192, 
193 
Anopla, 123 
Anoplodium, 94 
Antennary gland, 
279, 280, 288 
Antennata, 253 
Anthomedusae, 56, 77 
Antipatharia, 68 
Antipathes, 68 
Anura, 28, 333 
Apatura, 355 
Aphaniptera, 371 
Aphididae, 365 
Aphis, 366, 380 
Aphomia, 352 
Aphrodite, 156 
Aphrophora, 365 
Apiariae, 386 
29* 
257, 
| Apis, 386 
Aplysia, 206 
Aplysoidea, 207 
Apoda, 278 
Aporosa, 68 
Appendicularia, 447 
Aptera, 332 
| Apus, 260, 261, 268, 391 
| Araneida, 408 
| Arca, 192, 193 
| Arcella, 10, 11, 12 
Archerina, 6 
Archiannelida, 138 
Archicoel, 78 
Archigetes, 102, 103, 105 
Architeuthis, 223 
Arcyria, 7 
Arenicola, 150, 153, 157 
Argiope (a Brachiopod), 
170 
Argiope (a Spider), 415 
Argonauta, 221 
Argulus, 264, 268 
Argyroneta, 409, 411, 416 
Arista, 370 
Aristotle’s Lantern, 243 
Artemia, 261 
Arthropoda, 25, 34, 79, 
103, 253 
Arthrostraca, 282, 290 
Ascaris, 124, 126, 129 
Ascella, 37 
Ascidia, 442 
Ascidiacea, 450 
Ascidians, 434 
Ascones, 44 
Ascothoracica, 278 
Asellidae, 297 
Asellus, 268, 293 
Aspidiotus, 369 
Aspidochirotae, 251 
Aspidogaster, 108, 111 
Astacidae, 286 
Astacus, 260 
