Apteria, 372*, 409 



Apteryges, 398 



Apteryx, 398, 399, 408, 414, 417, 419, 

 420, 421, 422, 423, 426, 429, 600, 

 622 



Apteryx australis, 398, 399, 419 



Apteryx mantelli, 414, 415, 417 



Apteryx oweni, 420 



Aptornis, 403, 413, 417, 600, 622 



Aqueduct of Sylvius, 99* 



Aqueductus vestibuli, 144, 158, 174 



Aqueous chamber, of Eye, 108* 



Aqueous humour, 108* 



Aquila, 403, 423 



Aquinas, Thomas, 654 



Ara, 404, 416 



Arachnoid membrane, 100 



Arbor vitae, of Rabbit, 458* 



Arboreal fauna, 617* 



Archseoceti, 586 



Archceohyrax, 587 



Archc&opteryx, 397, 405, 430, 619 



Archceopteryx lithographica, 405, 406, 

 407, 430, 619 



Archceopteryx siemensii, 407 



Archseornithes, 397*, 405 



Archenteron, 280*, 281 



Archipallium, 561* 



Archipterygium, 163*, 250 



Arcifera, 285* 



Arctomys marmot, 617 



Ardea, 403, 409, 410 



Area opaca, 352, 424 



Area pellucida, 352, 424 



Area vasculosa, 426 



Argentea, 206*, 207, 208 



Aristotle, 647 



Armadillos, 465, 476, 484, 508, 509, 

 510, 511, 512, 513, 516, 547, 579, 585 



Arteries, 89, 90 See Vascular system 



Arthrodira, 252 



Articular, 77, 79* See Skull 



Artiodactyla, 468*, 487, 521, 522, 526, 

 527, 547, 558 



Arvicola, 575 



Arytenoids, of Lizard, 318 : Reptilia, 



. 347 : Pigeon, 385 : Rabbit,' 453 



ASCIDIA, 14 : Body -wall and Atrial 

 cavity, 14, 15 : Pharynx, 16, 17, 18 : 

 Enteric canal, 18 : Blood system, 

 18, 19 : Nervous system, 19, 20 : 

 Neural gland, 19, 20 : Excretory 

 system, 20 : Reproductive system, 

 20 : Systematic position, 23 : De- 

 velopment, 30 



Ascidia mammillata, 35 



Ascidiacea, 22*, 30 



Ascidise composite, 22*, 24, 25 



Ascidise simplices, 22*, 24 



Ascidians, 13 



Ascidiidce, 23 



Aspredo, 234 



Asses, 468, 580 



Aslacopsis, 602 



Astacus, 601 



Asteriscus, 208*, 209 



Astragalo -scaphoid, 344 



Astragalus, 259, 266, 344, 444 See 

 Limb -skeleton 



Astroscopus, 226 



Aides, 473 



Athecata, 359 



Atlas, 306* 



Atrial aperture, 14*, 15 



Atrial canals, of Larvacea, 23 



Atrial cavity, of Ascidia, 14, 15, 16, 17 



Atrial lobes, of Doliolum, 26 



Atrial siphon, 15, 17 



Atriopore, of Amphioxus, 43, 44, 47, 49 



Atrium, of Ascidia, 16, 35 : Amphioxus, 

 47, 49 



Auditory capsules, of Craniata, 73* 



Auditory foramina, 75 



Auditory nerve, 101, 102 See Brain 



Auditory organ See Ear 



Auditory ossicles, 441* See Ear 



Auditory region, of Craniata, 74* 



Augustine, 654 



Auks, 403, 422, 429, 431 



Auricle, 88 See Heart 



Auricular appendix, 449 



Australian region, 611* 



Autostylic skull, 76*, 185 



Aves, 64, 303, 366 : Example, 367 : 

 Distinctive characters and classi- 

 fication, 395 : General organisation, 

 405 : Archseornithes, 405 : External 

 characters of Neornithes, 407 : 

 Pterylosis, 409 : Skeleton, 411 : 

 Myology, 420 : Digestive organs, 



420 : Respiratory and vocal organs, 



421 : Circulatory organs, 421 : Ner- 

 vous system and sense organs, 421 : 

 Urinogenital organs, 422 : Develop- 

 ment, 422 : Distribution, 429 : 

 Ethology, 430 : Phylogeny, 430 



Avocet, 408 

 Axis, 306* 



Axis, basi -cranial, 498* 

 Axolotl, 284, 301, 302 

 Aye -Ayes, 472 



Azygos veins, of Rabbit, 452 : of 

 Urodela, 297, 298 



B 



>ABOONS, 473, 499, 538, 539 

 Baer, K. E. von, 659 

 Balcena, 466 

 Balcenidce, 466 

 Balcenoptera musculus, 51 



