660 



INDEX. 



Apteria, 604 

 Apteryges, 613 

 Apterygota, 477 

 Apteryx, 613 

 Apus, 416 

 Aquatic faunae, 179 

 Aqueduct of Sylvius, 534 

 Aqueous humor, 131 

 Aquila, 617 

 Arachnida, 444 

 Araneina, 451 

 Arbacia, 345 

 Arcella, 198 

 Archaean era, 180 

 Archaeopteryx, 33, 612 

 Archegony, 139 

 Archenteron, 103, 104, 156 

 Archianellidse, 313 

 Archigetis, 286 

 Archiptera, 477 

 Archipterygium, 529 

 Architeuthes, 384, 395 

 Arcidae, 367 

 Arcifera. 588 

 Arctic province, 178 

 Arctogaea, 177 

 Arctotherium, 647 

 Arcyria, 199 

 Ardea, 615 

 Arenicolidae, 313 

 Areolar connective tissue, 85 

 Argas, 454 

 Argina, 367 

 .Argiope, 327, 453 

 Argonauta, 392, 395 

 Argonautidae, 395 

 Argulidae, 422 

 Argulus, 421, 422 

 Ariolimax, 383 

 Arion, 383 

 Arista, 493 

 Aristotle, 7 



Aristotle's lantern, 345 

 Armadillidium, 442 

 Armadillo, 636 

 Armata, 317 

 Army worm, 495 

 Artemia, 416 



Arterial arches, 549 



Arteries, 112 



Arthrodira, 579 



Arthrogastrida, 447 



Arthropoda, 398 



Arthrostraca, 438 



Articular bone, 525 



Articular process, 519 



Articulata, 342, 398 



Artificial impregnation, 147 



Artificial selection, 43 



Artiodactyla, 640, 641 



Arvicola, 639 



Ascalabotae, 598 



Ascaridae, 301 



Ascaris, 145, 299 



Ascaris, fertilization in, 150 



Ascidiseformes, 508 



Ascidians, 505 



Ascones, 222, 225 



Ascyssa, 224 



Asellidae, 442 



Asellus, 440 



Asexual reproduction, 140, 143 



Asilidas, 493 



Asp, 60 1 



Aspergillum, 368 



Aspidobranchia, 378 



Aspidonectes, 596 



Aspidotus, 490 



Ass, 641 



Assimilation, organs of, 102 



Astacidae, 435 



Astacoidea, 435 



Astacus, 431, 43 2 > 435 



Astarte, 367 



Astartidse, 368 



Asterias, 337 



Asterias, early development, 146, 148 



Asteridae, 337 



Asterinidae, 337 



Asteriscus, 335, 337, 564 



Asteroidea, 333 



Astrsea, 261 



Astrangia.- 260, 261 



Astroides, 261 



Astrophyton, 338 



Asymmetrical form, 135 



