264 



INVERTEBRATE ZOOLOGY 



Annelid theory, 260 



Annelidan cross, 15, 148 



Annulations of leeches, 153 



Anodonta, 201 



Anomia, 201 



Anopheles, 45 



Anoplura, 251 



Anostraca, 211 



Antedon, 181, 182 



Antennae, 205, 207, 209, 214 215 



218, 236 

 Antennal gland, 217 

 Antennules, 207, 211 

 Anthomediisae, 102 

 Anthophysa, 34, 56 

 Anthozoa, 96, 103 

 Antipatharia, 103 

 Antipathes, 103 

 Anuraea, 143 

 Aphrodita, 151, 157 

 Apical plate, 150 

 Aplacophora, 201 

 Aplysiidae, 196 



Aplysina, 87 



Apoda, 182 



Apopyle, 83 



Appendages, 140, 203 

 biramous, 205, 206, 208 

 crustacean, 205 

 foliaceous, 206, 212 

 insectan, 238 

 phyllopodan, 206 

 polychaet, 148 

 rotifer, 140 

 schizopodal, 205, 206 



Apsilus, 143 



Apus, 210, 222 



Arachnid theory, 260 



Arachnida, 229, 234 



Araneina, 227, 234 



Arbacia, 177, 182 



Arboroid colony, 29 



Area, 201 



Arcella, 39, 41, 57 



Archenteron, 15, 70 



Archiannelida, 156, 158 



Archigetes, 118, 126 



Arcyria, 57 



Aronicola, 152, 157 

 Argonauta, 200, 201 

 Argvdus, 213, 222 

 Arion, 197, 201 

 Aristotle's lantern, 176 

 Armata, 158 

 Armillifer, 230, 234 

 Arrow-worms, 145 

 Artemia, 210, 222 

 Arthropoda, 203, 222, 233, 258 

 Articular sclerites, 241 

 Articulata, 162, 163, 164 

 Asaphus, 209 



Ascaris, 130, 131, 136 * 



germ cells, 10, 12 

 lumbricoides, 231 

 maturation, 12 

 megalocephala, 130 



Ascon, 82 



Asellus, 222, 223 



Asexual reproduction, 7 



Aspidobranchia, 196, 201 



Aspidocotylea, 125 



Aspidogaster, 125 



Asplanchna, 140, 143 



Astacus, 223 



Astasia, 56 



Asterias, 182 



Asterina, 182 



Asteroidea, 166, 169, 182 



Astrangia, 103 



Astrometis, 182 



Astropecten, 182 



Astrophyton, 175, 182 



Atlanta, 196, 201 



Atoke, 149 



Aurelia, 95, 103 



Auricles, 72 



Auricularia, 179 



Autolytus, 157 



Autosomes, 13 



Autotomy, 219 



Autotrophic, 24 



Avicularia, 160 



Axial gradient, 109 



Axon, 67 



Axopodia, 38 



Axostyle, 30 



