INDEX 



Abducens nerve, 296 



Acetabulum, 164 



Adaptive Radiations, Def., 7 



Adrenal glands, 318 



Age of Reptiles, 80 



Albinism, 116 



Allantois, 56, 67, 68, 92, 228 



Alligator, 61 



Dermal plates, 112 



Skull, 135 



Vascular system, 234 

 Amblystoma, 49, 52 

 Amnion, 56, 67, 345 

 Amphibia, 48 



Cleavage, 345 



Dermal plates, 110 



Evolution, 344 



Glands, 111 



Muscles, 187 



Xares, 132 



Ribs, 155 



Skull, 133 



Vascular system, 235 



Vertebrae, 149 

 Amphioxus, 14 ff. 



Embryology, 21 



Muscles, 181 



Skin, 107 



Spinal nerves, 277 



Vascular system, 221 

 Analogy, Def., 7 

 Anapsida, Skull, 134 

 Annelid Theory, 341 

 Anthropoidea, 82 

 Anthropoids, Evolution, 352 

 Antilocapra, 121 

 Antlers, 121 

 Anura, 52 



Aorta, Branches of, 38 

 Aortic Arches, 232 

 Apoda, 50 



Dermal plates, 110 



Aponeurosis, 178 

 Appendages 



Aquatic, 166 



Bipedal, 168 



Cursorial, 168 



Flying, 169 



Homology, 165 



Origin, 156 

 Appendicular Skeleton 125 

 Appendix, vermiform, 202, 204 

 Apteryx, 72 



Aquatic adaptation, 166 

 Arachnid Theory, 342 

 Arboreal adaptation, 169 

 Archaeopteryx, 71 



Evolution, 347 



Wing, 170 

 Archegosaurus, 50 



Skull 133 

 Archenteron 



Amphioxus, 22 



Frog, 53 



Reptile, 66 

 Archipallium. 288 

 Armadillo. 87 

 Artiodactyla, 87 

 Atrium, Amphioxus, 27 

 Auditory nerve, 297 

 Auditory organs, 309 

 Aves, 71 

 Axial skeleton, 125 



Balanoglossus, 11 

 Barriers, geographical, 326 

 Bats, 86 



Wing, 170 

 Bifocal vision, 308 

 Bilateral symmetry, Def., 5 

 Bipedal adaptations, 168 

 Birds, 71 



Embryology, 75 

 Integument, 114 



385 



