INDEX 



391 



Vrosophila persimilis, 57, 336 

 Drosophila pseudoobscura, 57, 336 

 Vrosophila robust a, 35 

 Du Rietz, G. E., 5, 17, 20, 51, 78, 



380 



Eagar, R. M. C., 125, 128, 129, 152 



Eidos, 11 



Eimer, G. H. T., 15, 20 



Elliott, A.M., 256, 317, 318 



Embryologist's viewpoint, 325 



Engler, A., 42 



Environment 



influence on freshwater animals, 

 97 

 Enzvmes, 361 

 Euplotes, 271-276, 351 



breeding system, 274 



mating hormones, 273 



mating types, 273 



species and varieties, 271 

 Euplotes patella, Til 



Fish, 356 



hybridization in, 110 

 Flagellates, 280-283 



sexual processes, 280 ff . 

 Fossil animals, 125-151, 384 



application of biological concept, 

 132 



incompleteness of record, 142 



size-frequency distribution of pop- 

 ulation, 141 



species, 384 

 Frequency 



of good species, 52 

 Freshwater animals, 81-123 

 Frog, see Rana 



Gammarus, 350 



Gasterosteus, 351 



Gene pool, 14, 26 



Gene recombination, 23-37; see also 



Recombination 

 Genes 



drift, 360 



flow, 32 



Genotype, 24 



Ci.sc, A. C, 190-192,209,318 



Cilia, 48-50, 62-64 



Gilia capitata, 62 



Cilia leptantha, 47 



Gilia millefoliata, 62 



Gilia tenuiflora-latiflora, 63 



Gillis, C. L., 10, 19 



Gill rakers, 112, 117 



Gilman, L. C., 236, 239, 240, 318 



Ginkgo biloba, 65 



Ginsburg, I., 12, 20 



Gloger, C. L., 9, 20 



Godron, D. A., 7, 20 



Grant, V., 372, 376, 381 



Greene, E. L., 3, 20 



Gregg, J. R., 6, 20 



Groupings, 42, 67 



Gruchy, D. F., 256, 318 



Habituation, 358 

 Haploidy, 202 

 Hayes, B. E., 257, 317 

 Hermaphroditism, 70 

 Heuts, M. J., 351, 366 

 History of problem, 1 

 Hiwatashi, K., 236, 240, 3*18, 319 

 Hoare, C. A., 283, 319 ^ 

 Homogamic complex, 67 

 Hooijer, D. A., 133, 134, 152 

 Hubbs, C. L., 110, 122 

 Human species, 34 

 Hybridization, 32, 55, 59, 62, 70-72, 

 106, 118, 327, 377 



in fishes, 110 



introgressive, 110, 112 



reasons for, 74 

 Hybrids, 330 



methods of identification, 58 



sterility of, 44 



Identification 



methods of, for hybrids, 58 

 Illiger, J. C. W., 8, 20 

 Inbreeders, 206 ff. 

 Inbreeding, 297 ff . 



indications of, 220 ff. 



obligatory, 280 



