INDEX 



415 



Aster, 73 



Asteroidea, classified, 269, 272 



Astral rays, 72, 76; as protoplasmic 



threads, 79 

 Asymmetry, 107 

 Atrial aperture, 103 

 Attraction-sphere, 32, 33 

 Auchenia, 329; range of, 291 

 Auditory nerve, 230 

 Auricle, 120, 124 

 Australia, absence of ungulates from 354; 



marsupials of, 353 

 Autobiography, Darwin's, 341 

 Automatic actions, 161, 163 

 Autonomic nervovis system, control of, 163 

 Aves, classified, 271, 274 

 Avicularia, 100, 101 



Axial skeleton, 135; of cat, figure of, 136 

 Axon, 114, 142, 159, 160, 161, 162 

 Azotobacter, 49 



Baboons, 335 



Back cross, 246 



Bacteria, 31, 49, 166; nitrogen-fixing, 49 



Bacteriologist, 167 



Bacteriology, 167 



Bacterium, 167 



Badger, 175 



Balanoglossida, classified, 270 



Baltimore oriole, range of, 292 



Bar eye in Drosophila, 345 



Barnacle, 165, 350, 351 



Barriers to migration, 305, 308 



Beaded wing in Drosophila, 345 



Beagle, 340 



Beans, fertilization in, 186 



Bees, 181; artificial generation of, 165; 



polymorphism in, 278 

 Belgium, ancient men of, 336 

 Belon, 17 

 Benzol, 187 

 Berengario, 10, 11 

 Bicornuate uterus in mammal, figure of, 



133 

 Bidder's canal, 131 

 Bilateral symmetry, 105 

 Bile, 118, 145. (See also Liver.) 

 Bile duct, 118, 120, 227, 228 

 Bile salts, 187 



Binomial system (see Nomenclature) 

 Biogenetic law, 234, 327 

 Biology, animal, 1; early history of, 7-24 

 Bionomics, 275 



Birds, birth stages in, 201; copulatory 

 habits of, 193; fertihzation in, 194; 

 hermaphroditism, 191; incubation 

 in, 198; migration of, 300; nests of, 

 198; parental care in, 201 



Birth stages, in various animals, 201-204; 

 relation to parental care, 204 



Bison, congregation of, 278; range of, 292 



Black guinea-pig, 243 



Bladder, in lizard, 195 



Blainville, 262 



Blastocoele, 218, 219, 220, 221, 222 



Blastophaga, habits, 282 



Blastopore, 220, 221, 222, 228 



Blastostyle, 97, 186 



Blastula, 218, 219, 220, 221 



Blood, 123; circulation of, 12; in kidney, 

 152; oxygen in, 149 



Blood supply in viviparous forms, 196 



Blood transfusions, 350 



Blood vessels, innervation of, 163 



Blue jay, range of, 292 



Body, evolution of in horse series, 324 



Bolina hydatina, 182 



Bone, 27, 41 



Botany, 6 



Botryllus, 101 



Botryllus goiildii, 102 



Bougainvillea, 96, 97, 186; budding in, 

 168, 169 



Bougainvillea ramosa, 96 



Bowman's capsule, 126, 127, 152 



Brachiopoda, classified, 270, 274 



Brachiopods, 314 



Brackish water, 316 



Bracts, 99, 100 



Bradypus, frontispiece 



Brain, 114, 161, 162, 225, 227, 228 (see 

 also Cerebrum and Cerebellum); of 

 earthworm, 119 



Branchiopoda, classified, 270 



Breathing, 148 



Breeding habits, 189-205 



Brittle stars, classified, 272 



Bronchi, 63, 123, 228, 229 



Brood pouch (see Pouch). 



Brook trout and Lernseopoda, 286 



Brush turkey (see Megapodes) 



Bryozoa, 100, 171; classified, 270, 274 



Buccal cavity, 117 



Budding, 168, 186; external, 171; inter- 

 nal, 169; lateral, 169 



Buds, 169 



