412 



rRlNClFLEH OF ANIMAL BIOLOGY 



Auriculoventricular node, 128 



Autonomic n(>rvou« system, 143, 146, 147 



Autosomal luikage, 236, 237 



Autosome, 236 



Aves, 279 



Axial skeleton, 90, 91 



Axon, 143, 144 



B 



Backcross, 227 



two-pair, 230, 231 

 Balanoglossus, 276 

 Barnacle, 300 



homology of, with Sacculina, 350, 361 

 Bases, 35, 3(i 

 B complex, 111 



Beagh\ Darwin's voyage on the, 360 

 Beetle, 272 

 Beriberi, 111 

 Bidder's canal, 136, 178 

 Bilateral symmetry, 77, 78 

 Bile, 103, 105 

 Bile duct, 103 



iji embryo, 211, 212 

 Biogenetic law. 74, 255, 256, 257 

 Biology, defined, 1 



history of, 1-20 



scope of, 20-22 

 Birds, 278 



cleavage of, 201 



evolution of, 335 



migration of, 318 

 Birth stages, 189-192 



relation of, to parental can', 192 

 Bladder, 136, 137, 178, 179, 183 

 Blainville, Henri de, taxonomy, 246 

 Blastocoele, 73, 201, 202, 206 

 Blastopore, 73, 204, 206 

 Blastostyle, 173 

 Blastula, 73, 201, 202, 206 

 Blood, circulation of, S, 9 



coagulation of, 130 



composition of, 126 



pressure, 128, 129 

 Blood system, 122-126 



of dogfish, 123 

 Body cavities, 80, 81 

 Bone, 83 



Bougainvillea, 172 

 Bowman's capsule, 135, 136, 137 



Brachiopoda, 276, 331 

 Bract, 174, 175 

 Brain, 141 



in embryo, 208, 210, 211, 212 

 Breathing, 116, 117 

 Breeding behavior, 177-192 

 Brittle star, 268 

 Bronchi, 115 



in embryo, 211 

 Bronchioles, 115 

 Brush turkey, nest of, 186, 187 

 Bryozoa, 275 



reproduction of, 171 

 Buccal cavity, in earthworm, 101 



in frog, 102 



in mammal, 101, 102 

 Budding, 170-174 



external, 172, 173 



C 



Caecum, 103 



Calcarea, 262 



Calciferol, 112 



Cambrian, 330, 331, 335 



Camel family, discontinuity of range of 



311 

 Capillaries, 122, 123, 129 

 Carbohydrates, 40 



storage of, 107 

 Carbon dioxide, as waste, 133 

 Carboniferous, 330 

 Cardiac muscle, 96 

 Caroten(>, 111 

 Caipals, 93 

 Cartilnge, 82 

 Cast, a fossil, 327 

 Catnbolism, 4(i 

 Catalase. 42 

 Catalyst, 42 

 Cell division, 55-()3 

 Cell inclusions, 26, 28 

 Cell membrane, 26, 27 

 Cells, 23-29 



generalized, 26 



relation of, to other cells, 28, 29 



shape of, 24, 25 



size of, 23, 24 

 Cell theory, 14-16 

 Cell wail, 26, 27 

 Cenozoic, 330, 335 



