Subject Index 



Polios set in boldface t.\ pe refer to illustrations. 



Aardvark, 745, 746 

 Abdominal cavity, 21 



veins, 74 



walls, 91, 92, 587, 588 

 Abducent nerve, 100, 163, 164 

 Abductors, 94, 96 

 Absorption, 155, 156 

 Acanthodii, 421 



Accessory nerve, 168, 183, 481, 482 

 Accommodation, 201, 533, 682, 683, 684 

 Acetabulum, 129, 130, 131 

 Acetylcholine, 190, 191 

 Acinus (alveolus), 31, 34 

 Acoustic nerve, 166, 692, 715 

 Acrania, 407 

 Acrodont, 47, 48, 52 

 Acromegaly, 226 

 Acromion, 132 

 Actinopterygii, 420, 425 

 Adaptation (s), 230, 246, 299, 463, 782, 785 



aquatic, 369, 781 



arboreal, 801 



of birds, 556-558 



to climate, 568 



for flight, 504, 505 



fossorial, 801 



of hindlegs, 372 



of mammals, 568, 569, 782 



to pressure, 569 



of teeth, 53 

 Adaptive radiation, 366, 367, 368-370 

 Addison's disease, 217 

 Adductors, 96 

 Adipose tissue, 327, 328 

 Adrenal action, emergency theory of, 218 



cortex, 217 



medulla, 217, 21S, 219 

 Adrenalin (epinephrine), 190, 218, 219 

 Adrenals (adrenal glands, suprarenal 

 glands), 190, 217, 218, 219, 220 



development of, 217 



Adrenals— (( 'ontinued) 



functions of, 217-219 



innervation of, 218 

 Adventitia, 28 

 Aepyornis, 554 

 Afferent (sensory), 141 



fibers, 142, 179, 182, 211 



nerves, 159, 184 

 Afterbirth, 295 

 Age of fishes, 789 



of mammals, 567 



of reptiles, 497 

 Air-bladders (swim-bladders), 276, 425, 



427, 428, 433 

 Air-capillaries, 519 



Air-sacs, 519, 520, 521, 522, 523-525, 621 

 Albatrosses, 545, 556 



Albumen, 233, 235, 236, 238, 243, 251, 293 

 Alcedo ispida, 552 



Alimentary canal, 14, 27, 639, 640 (see 

 also Alimentary tube, Digestive 

 tube) 



passages, 562, 610 



system, 25-56, 634-642 



tube, 143, 154, 275 (see also Digestive 

 tube, Alimentary canal) 

 Alimentation, 213 

 Alisphenoids, 124 

 Allantoic arteries, 293 



blood-vessels, 293, 295 



cavity, 295 



stalk, 290 

 AUantois, 6, 241, 242, 244, 290, 292, 295, 



483 

 Alligator(s), 72, 101, 107, 152, 235, 240, 



475, 480, 490, 492, 565, 703 

 Alternation of generations, 231 

 Alveolar ducts, 616 



glands, 310, 311 

 Alveolus© of glands (acinus), 31, 34 



of lungs, 61, 616 (see also Air-sacs) 



of teeth (tooth socket), 35, 37, 39, 42 

 Amblvstoma, 208, 445, 452, 454 



823 



