404 



INDEX 



Apodemus, local specific intergradation, 



103 

 Aporus, modifications for burrowing, 278 

 Aquatic mammals, atrophy of limbs, 43 

 Arcella, Dauermodifikationen, 35 

 Arctia, experiments on, 36 

 Arctic mammals, colour, 241 

 Argasidae, armature of hypostome, 



adaptive differences, 286 

 Argus Pheasant, display, 333 



, tail-pattern, 272 



Argynnis paphia var. valesina, 94 



Arianta, comparison of old and young 



shells, 2 1 2 

 — , ribbed forms in the Alps, 288 

 — , selective elimination by birds, 203 

 Aricia, geographical variation, 1 1 3 

 — , recombination of characters, 25 

 Arion, non-heritable variant, 20 

 — , polymorphism, 101 

 Artemia, doubtful species, 63 

 — , polyploidy, 24 

 Ascaris, polyploidy, 24 

 Ascidians, intraspecific sterility, 157 

 Ashford, ' darts ' of Mollusca, 297 

 Assimilation, 233 



Atlantic Cod, geographical races, 114 

 , ' trends ' in number of vertebrae, 



Atyidae, dimorphism, 1 1 



Aubertin, colonial divergence in Cepea, 



Aubertin and others, changes in popu- 

 lations of Mollusca, 216 



, colonial divergence in Cochli- 



cella, 99, 137 



, insular forms of Mollusca, 139 



Autocatalytic substances, genes as, 29 

 Avinoff, distribution of forms with 

 similar genitalia, 154 



Babcock, voltinism in the Cornborer, 



53> 144 

 Babcock and Vance, voltinism in the 



Cornborer, 53 

 Babirusa, enlarged tusks, 336 

 Bacot, races in lice, 75 

 Bacteria, Dauermodifikationen, 35 

 Baetis, adaptation to water-flow, 266 

 Banks, Gloger's Law in birds, 48 

 — , geographical races in Sciurus, 114 

 Bannerman, protective resemblance in 



Galerida, 238-39 

 Banta, pure lines, 191 

 Barrett and Crandall, Bower Birds, 342 

 Barrett-Hamilton and Hinton, compari- 

 son of recent and Pleistocene 

 mammals, 132-33 

 , distribution of Apodemus, 1 03 



Barrett-Hamilton and Hinton, race of 



rabbit on Sunk Island, 1 1 7 

 Bartsch, hereditary stability of races of 



Cerion, 70 

 Batesian mimicry, 251 

 Bateson, accommodation in Lepido- 



pterous pupae, 281 

 — , adaptation, 348 

 — , change in population of Coereba, 



2I 5 



— , continuous and discontinuous varia- 

 tion, 88 



— , Darwin's idea of variation, 123 



— , effects of brackish water on Mollusca, 

 81 



— , efficacy of Natural Selection, 3 1 8 



— , melanic Amphidasys, 213-14 



— , on variation, 2 



— , shape of Cardium, 169 



— , survival in spite of non-adaptation, 



355 

 Bateson and Brindley, dimorphism of 



male Forficula, 123 

 Bather, definition of gens, 71 

 — , polyphyly and convergence, 61 

 Bats, geographical races, 1 08 

 — ■, species roosting separately, 148 

 Baumberger, voltinism in insects, 52 

 Beebe, variation in Scardafella, 20, 48 

 Beecher, senescence in phyletic groups, 



33° 

 Bees, mimicry of, by flies, 252 



— , nest-temperature, 360 



— , oligolectic, 349, 352 



■ — , also see Apis 



Beetles, determinate evolution, 325 



— , winglessness, 147 



Beljajeff, experiments on Mantis, 202 



Benson, coat-colour of rodents in lava 



fields, 236 



Benthoctopus, deep-sea forms, 270 



Bequaert, discontinuous races in Vespa, 



116 



— , species intergradation in Eumenes, 89 



— , variation in Eumenes, 67 



— , variation in Synagris, 93 



Berg, explanation of mimicry, 258 



— , nature of adaptation, 363 



— , resemblance between species living 



in different countries, 255 



Bergman's Law, 45 



Bergson, theory of evolution, 344-45 



Berry, orthogenesis, 325 



Bertalanffy, organismal adaptation, 352 



Bezzi, winglessness in flies, 147 



Biological races, see Physiological races 



Bioseries, 65 



Biotype, 64 



— , homozygous, 72 



— , in allogamous and autogamous 

 species, 72 



