INDEX 



All numbers refer to pages : words in italics are names of families, genera and 

 species : words in thick type are names of higher divisions : words in small 

 capitals are names of examples. Numbers in thick type are numbers of pages on 

 which there are figures : an asterisk after a number indicates a definition of the 

 term or of the group. 



A 



ARD-VARKS, 479, 604 See Orycteropus 



Abdomen Mammals, 72*, 447 



Abdominal cavity, of Craniata, 72 



Abdominal pore, 67, 68, 146, 250 



Abdominal ribs, 302, 347, 419 



Abdominal vein, 281, 326 



Abducent nerve, of Craniata, 105 



Abductor muscles, 276 



Abiogenesis, 671* 



Abomasum, 571* 



Abyssal fauna, 635* 



Acanthias, 178 



Acanthodei, 168* 



Acanthodes, 169 



Acanthodrilus, 621 



Acanthopteri, 221*, 225, 228, 232, 243 



Accessory nerve, of Craniata, 104, 106 



Accessory scapula, 430 



Accipitres, 416, 445 



Acetabulum, of Craniata, 83, 84* 



Acipenser, 219 See Sturgeon 



Acipenser ruthenus, 219 



Acrania, 44 See Amphioxus 



Acrocoracoid process, 390 



Acrodont, 355* 



Acromion process, of Pigeon, 391 ; Rab- 

 bit, 455 See Pectoral arch 



Acustico-lateral centre, 162 



Ad-digital, 385 



Adductor muscles, 276 



Adelochorda, 2* : Affinities, 13 



Adhesive papilla, of Ascidian larva, 34, 

 37 



Adipose bodies, of Frog, 287 : Lizard, 

 .328 



Adipose fin, 200* 



Adipose lobe, 200 



Adrenals, of Craniata, 120 : Frog, 286 : 

 Pigeon, 397 : Rabbit, 473 



^Egithognathous, 428* 



jflpyornis, 411, 436, 443, 642 



jEpyornithes, 411 



Aerial fauna, 637 



Afferent branchial arteries, 92 : of Am- 

 phioxus, 51 See Vascular system 



Affinities See Relationships 



After-shaft of Feather, 381, 423 



Agamidce, 369 



Agassiz, Alex., 684 



Agassiz, Louis, 682 



Aggressive resemblance, 657 



Aglossa, 294*, 304 



Agoutis, 507 



Air-bladder, 90* 



Air-bladder, of Trout, 210, 211 : Teleos- 

 tomi, 236 



Air-sacs, of Chamseleon, 358 : Pigeon, 

 399, 400 : Birds, 434 



Air-space, of Bird's egg, 436 



Ala spuria, 385* 



Alar membrane, 380* 



Alaudidce, 417 



Albatrosses, 415, 430, 436 



Albula, 238 



Albumen, of Bird's egg, 408, 435 



Alca, 416 



Alca impennis, 426, 443 



Alcedinidce, 417, 436 



Ali-sphenoid, 79*, 80 See Skull 



Allantoic bladder, of Craniata, 120* 



Allantois, Reptiles, 313, 365 : Bird, 441, 

 442 : Rabbit, 475 : Mammalia, 591 



Alligator, 336, 354, 355, 357, 360, 368, 

 370 



Alpine fauna, 638 



Altrices, 442* 



697 



