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, 471 See Orycteropus 



Abiogenesis, 631 



Abdominal cavity, of Craniata, 64 



Abducent nerve, of Craniata, 98 



Abomasum, 538 



Abyssal fauna, 599 



Acanthias, 165 



Acanthodea, 155* 



Acanthodes, 156 



A canthodrilidce, 585 



Acanthopteri, 205*, 209, 210, 212, 217, 

 226 



Accessory nerve, of Craniata, 98, 99 



Acetabulum, of Craniata, 77 



Acipenser, 203 



Acipenser ruthenus, 203 



Accipitres, 388, 416 



Acrania, 38, 58 See Amphioxus 



Acrocoracoid process, 363 



Acromion process, of Pigeon, 363 ; Rab- 

 bit, 426 See Pectoral arch 



Ad -digital, 356 



Adductor muscles, 256 



Adelochorda, 1 : Affinities, 11 



Adhesive papilla, of Ascidian larva, 29 



Adipose bodies, of Frog, 267 : Lizard, 

 306 



Adipose lobe, 185 



Adrenals, of Pigeon, 370 : Rabbit, 370 



^Egithognathous, 400* 



sEpiornis, 384, 414 



JEpiomithes, 384 



Aerial fauna, 601 



Afferent branchial arteries, 84 See Vas- 

 cular system 



Affinities See Relationships 



After-shaft of Feather, 354, 395 



Agamida*, 342 



Agassiz, Louis, 642 



Aylossa, 273, 283 



Aguti, 476 



Air-bladder, 84 



Air-bladder, of Trout, 197 : Teleostomi, 

 220 



Air-sacs, of Chameleon, 335 : Pigeon, 

 371 : Birds, 406 



Air-space, of Bird's egg, 408 



Ala spuria, 357 



Alar membrane, 352* 



Alaudidfe, 389* 



Albatrosses, 387, 402 



Albumen, of Bird's egg, 380, 407 



Aha, 388 



Alca impennis, 398, 414 



Ahedinidw, 389 



Ali-sphenoid, 72* See Skull 



Allantoic bladder, of Craniata, 113 



Allantois Reptiles, 338 : Bird, 412, 413 : 

 Rabbit, 446 : Mammalia, 561 



Alligator, 329, 330, 335, 341, 342 



All ula, 223 



Altrices, 414 



Alveoli, 429 



Alveoli, of lung, 371, 438 



Alytes obstetricans, 284 



Ambiens muscle, 368 



Amblyopsi* spelceus, 601 



Amblypoda, 454*, 573 



Amblystoma, 272, 278, 282, 289 



Amia, 204, 209, 213, 214, 218, 220, 224 



Amia calva, 204 



A mm ocoetes, 1 28 



Amnion, of Reptiles, 338 : Birds, 412 : 

 Rabbit, 446 : Mammals, 556 



Amniota, 291 



Amphibia, 245 : Example, 245 : Distinc- 

 tive characters and classification, 271 : 

 General organisation, 273 : External 



u u 2 



