This page has been validated.
onthophagus.
INDEX.
owen.
665
femora of the male, and on the head and thorax of the female, 297.
- Onthophagus, 295.
- rangifer, sexual differences of, 296; variation in the horns of the male, 297.
- Ophidia, sexual differences of, 351.
- Ophidium, 347.
- Opossum, wide range of, in America, 169.
- Optic nerve, atrophy of the, caused by destruction of the eye, 32.
- Orang-Outan, 561; Bischoff on the agreement of the brain of the, with that of man, 6; adult age of the, 8; ears of the, 14; vermiform appendage of, 21; hands of the, 50; absence of mastoid processes in the, 53; platforms built by the, 66; alarmed at the sight of a turtle, 72; using a stick as a lever, 81; using missiles, 81; using the leaves of the Pandanus as a night covering, 82; direction of the hair on the arms of the, 151; its aberrant characters, 154; supposed evolution of the, 177; voice of the, 527; monogamous habits of the, 590; male, beard of the, 531.
- Oranges, treatment of, by monkeys, 50.
- Orange-tip butterfly, 308, 312, 313.
- Orchestia Darwinii, dimorphism of males of, 268.
- Tucuratinga, limbs of, 267, 271.
- Ordeal, trial by, 96.
- Oreas canna, colours of, 535.
- Derbianus, colours of, 535, 543.
- Organs, prehensile, 209; utilised for new purposes, 571.
- Organic scale, von Baer's definition of progress in, 164.
- Orioles, nidification of, 453.
- Oriolus, species of, breeding in immature plumage, 484.
- melanocephalus, coloration of the sexes in, 460.
- Ornaments, prevalence of similar, 179; of male birds, 367; fondness of savages for, 574.
- Ornamental characters, equal transmission of, to both sexes, in mammals, 541; of monkeys, 549.
- Ornithoptera crœsus, 250.
- Ornithorhynchus, 156; reptilian tendency of, 159; spur of the male, 502.
- Orocetes erythrogastra, young of, 487.
- Orrony, Grotto of, 22.
- Orsodacna atra, difference of colour in the sexes of, 294.
- Orthoptera, 282; metamorphosis of, 237; stridulating apparatus of, 283, 288; colours of, 289; rudimentary stridulating organs in female, 288; stridulation of the, and Homoptera, discussed, 288.
- Ortygornis gularis, pugnacity of the male, 363.
- Oryctes, stridulation of, 303; sexual differences in the stridulant organs of, 305.
- Oryx leucoryx, use of the horns of, 509, 518.
- Osphranter rufus, sexual difference in the colour of, 533.
- Ostrich, African, sexes and incubation of the, 478.
- Ostriches, stripes of young, 464.
- Otaria jubata, mane of the male, 521.
- nigrescens, difference in the coloration of the sexes of, 534.
- Otis bengalensis, love-antics of the male, 380.
- tarda, throat-pouch of the male, 373; polygamous, 219.
- Ouzel, ring-, colours and nidification of the, 455.
- , water-, colours and nidification of the, 455.
- Ovibos moschatus, horns of, 505.
- Ovipositor of insects, 208.
- Ovis cycloceros, mode of fighting of, 508, 513.
- Ovule of man, 9.
- Owen, Prof., on the Corpora Wolffiana, 11; on the great toe in man, 11; on the nictitating membrane and semilunar fold, 17; on the development of the posterior molars in different races of man, 20; on the length of the cœcum in the Koala, 20; on the coccygeal vertebræ, 23; on rudimentary structures belonging to the reproductive system, 24; on abnormal conditions of the human uterus, 38,
