6o8 



INDEX 



Aphis, 569 



Appendages, lateral, and their skele- 

 ton : Frog, 5, 28, 36, 48, 51 ; 

 Crayfish, 361, 363 ; Dogfish, 433, 

 441 ; Rabbit, 501, 503 ; develop- 

 ment of, in Vertebrates, 596 



Aqueous chamber and humour, 



183 



Arachnoid fluid, 155 



Archenteron, 201 384, 574 



Archicerebrum, 380 



Area vasculosa, 590, 599 



Arm, see Fore-limb 



Arterial arches, 80, 451, 523 



Arteries : Frog, 27, So ; Crayfish, 

 376 ; Mussel, 407 ; Dogfish, 449 ; 

 Rabbit, 522 ; Vertebrate embryo, 

 590 



Arthobranch, 375 



Arthropoda, 220, 360, 386, 411 



Articular membrane, 361, 368 



Articular processes, see Zygapo- 

 physes 



Artificial selection, 227 



Arytenoid cartilage, 144, 517 



Ascaris, 153 



Asexual generation, see Agamo- 

 bium 



Asexual reproduction, ' see Fission, 

 Budding, Spore 



Assimilation, 149, 234, 305 



ASTACUS, see Crayfish 



Astragalus, 51, 504 



Atlas vertebra, 498 



Atrial pore, 420 



Atrium, 420, 421 



Atrophy, see Vestige 



Auditory capsule, 39, 41, 436, 492 



Auditory organ : Fwg, 45, 186 ; 

 Crayfish, 381 ; Mussel, 409 ; Dog- 

 fish, 465 ; Rabbit, 535 ; develop- 

 ment of, in Vertebrates, 589 



Auditory ossicles, 492, 536 



Auricle, see Heart 



Automatism, see Movements 



Aves, 219, 418 



Axial fibre : of Vorticella, 272 ; of 

 Carchesium, 277 



Axial parts, 4 



Axis fibre, see Neuraxis 



Axis vertebra, 499 



B 



JACTERIA, 152; structure, 257; 

 nutrition, 257 ; animals or plants ? 

 257 ; rapid multiplication, 289 ; 

 practical directions, 260 



Backbone, see Vertebral column 



Basal cartilages of fins, or basalia, 

 441-443 



Bell of medusae, see Umbrella 



Bilateral symmetry, 296 



Bile, 69 



Bile-duct, 68, 447, 516 



Bile-passages, 133 



Binomial nomenclature, 215 



Biogenesis, 288 



Biology, I 



Bird, development of, 581 et seq. 



Birds, see Aves 



Bladder, see Gall-bladder and Uri- 

 nary bladder 



Blastoccele, see Segmentation-cavity 



Blastoderm, 384, 470, 573 



,, embryonic and extra- 



embryonic portions, 590, 

 596 



Blastodermic vesicle, 582, 601 



Blastomere, 573 



Blastopore, 201, 349, 384, 574, 580 



Blastostyle, 309, 313 



Blastula, 574 



Blind spot, 556 



Blood : Frog, 20, 78, 85 ; Earth- 

 worm, 336 ; Crayfish, 379 ; 

 Mussel, 408 ; Lance let, 424 ; Dog- 

 fish, 449 ; Rabbit, 483, 557 



Blood-corpuscles : colourless, see 

 Leucocytes ; red, 105, 458, 483, 



557 



Blood-sinus, see Sinus 

 Blood-vessels : Frog, 78, 107 ; 



Earthworm, 337 ; Crayfish, 375 ; 



