7 8 4 



INDEX. 



Aqueous humour of Eye, 

 Arachnoidea, . . 



Arachnoid membrane, . 

 ,, fluid, . . 

 Araneidse, . . . 

 Area, .... 

 Arcella, ... 

 Archseoceti, ... 

 Archseopteryx, . . 

 Archegosaurus, . . 



PAGE 



. 446 

 . 327 

 . 438 

 -438 

 331 



. 372 

 . 99 

 . 708 

 .617 



-557 

 67, 448 



Archenteron, 

 Archerina, . 

 Archi- Annelida, . . .211 

 Archi-cerebrum, . . .271 

 Archi-Chsetopoda, . .211 

 Archiccele, . . . .176 

 Archigetes, . . . .171 

 Archinephric duct Segmental 



duct, .... 461 

 Archipterygium of Fishes, . 521 

 Archoplasm, . . . 45 

 Arctocyon, . . . . 717 

 Arctoidea, . . . . 715 

 Arctomys, . . . . 711 

 Arctopithecini, . . . 724 

 Arenicola, . . . .201 

 Structure of, . 202-6 

 Argonauta, .... 386 

 Argulus, .... 269 

 Argyroneta, .... 336 

 Arion, ..... 358 

 Aristotle's lantern, . . 237 



Arius, ..... 526 

 Armadillo (Crustacean), . 277 

 ,, (Mammal), Exo- 



skeleton of, . . 690 



Armadillos, .... 690 

 Arrow-worms, . . . 222 

 Artemia, .... 269 

 Arterial arches of Vertebrates, 455 

 ,, system of embryo of 



higher Vertebrates, 455 



of Fish, . 455 



,, of Frog, . 542 



,, ,, of Pigeon, . 610 



,, ,, of Rabbit, . 673 



Arthrobranchs of Crayfish, . 264 



Arthropoda, Classes of, . 7, 252 



,, General characters of, 253 



Arthrostraca, .... 269 



Articular, . . 431, 586, 605 

 Articulata, .... 246 

 Artiodactyla, .... 693 

 , , and Perisso- 



dactyla contrasted, . 693 

 Arvicola, . . . . 711 

 Asaphus, . . . .341 

 Ascaridse, . . . .184 

 Ascaris, . . . . .183 

 Ascetta, . . . 117 



Ascidia, . . . 401, 409 



Ascidiacea, .... 409 

 Ascon type (of Sponge), . 118 

 Asellus, .... 277 



Asexual reproduction, . . 51 

 Aspergillum, .... 372 

 Aspredo, . . . . .526 

 Astacus, . . . 253-69 

 Asteracanthion, . . . 235 

 Asterias, . . . 229, 235 

 Asteroidea, .... 229 

 Astraea, . . . 154, 157 



Astropecten, .... 235 

 Astrophyton, . . . 236 



Astrorhizidae, . . .106 



Atavisms or Reversions, . 83 



Atax, 336 



Ateles, 725 



Atheoe, .... 566 



Atlanta, . . . -357 



Atlantosaurus, . . . 593 

 Atlas vertebra, . . . 660 

 Atrial cavity, . . 401, 416 



Atriopore of Amphioxus, . 416 



Attidse, 336 



Atypus, 336 



Auchenia, .... 696 



Auditory capsules of skull, . 427 



,, nerve, . . . 441 



,, organs of Insects, . 311 



Aulastoma, . . . .214 



Aulosphaera, . . . .103 



Aurelia, . -133, 142, 156 



,, Life history of, 146, 147 



,, Relatives of, . .147 



Auricles of Vertebrate heart, . 454 



Auricularia (of Holothuria), . 243 



Australian region, . . . 764 



Autostylic, .... 534 



Aves, see Birds, . . 2, 595 



