420 



INDEX 



Ortitis furcifer, processes of anterior fem- 

 ora of the male, and on the head and 

 thorax of the female, i. 361. 



Onthophsigns, i. 360. 



Onthophagus rangifer, sexual differences 

 of, i. 35S : variation in the horns of the 

 male, i. 360. 



OpniDiA, sexual differences of, ii. 27. 



Opossum, wide range of, in America, i. 

 211. 



Optic nerve, atrophy of the, caused by de- 

 struction of the eye, i. 112. 



Orang-Outan, ii. 308; Bischoff on the 

 agreement of the brain of the, with that 

 of man, i. 11 ; adult age of the, i. 13 ; 

 cars of the, i. 21 ; vermiform appendage 

 of, i. 26; platforms built by the, i. 35; 

 alarmed at the sight of a turtle, i. 41 ; 

 using a stick as a lever, i. 49 ; using mis- 

 siles, i. 50 ; usiug the leaves of the Pan- 

 danus as a night covering, i. 51 ; hands 

 of the, i. 134 ; absence of mastoid pro- 

 cesses in the, i. 138; direction of the 

 hair on the arms of the, i. 1S5; its aber- 

 rant characters, i. 188; supposed evolu- 

 tion of the, i. 222 ; voice of the. ii. 265 ; 

 monogamous habits of the, ii. 315 ; male, 

 beard of the, ii. 270. 



Oranges, treatment of, by monkeys, i. 134. 



Orange-tip butterfly, i. 376, 3S1. 



Orchestia Darwinii, dimorphism of males 

 of, i. 322. 



Orchestic/* Tucuratinga, limbs of, i. 320, 

 327. 



Ordeal, i. 66. 



Oreas canna, colors of, ii. 274. 



Oreas Derbiamis, colors of, ii. 274, 2S6. 



Organs, prehensile, i. 248 ; utilized for 

 new purposes, ii. 319. 



Organic scale, Von Baer's definition of 

 progress in, i. 203. 



Orioles, nidification of, ii. 160. 



Oriolus, species of, breeding in immature 

 plumage, ii. 205, 206. 



Oriolus melanocephalus, coloration of the 

 sexes in, ii. 170. 



Ornaments, prevalence of similar, i. 224 ; 

 fondness of savages for, ii. 324 ; of male 

 birds, ii. 47. 



Ornamental characters, equal transmis- 

 sion of. to both sexes, in mammals, ii. 

 283; of monkeys, ii. 291. 



Ornithoptera Croesus, i. 301. 



Ornithorhynchus, i. 192; spur of the 

 male, ii. 231 ; reptilian tendency of, i. 196. 



Orocetes erythrogastra, young of, ii. 210. 



Orrony, Grotto of. i. 28. 



Orsodacna atra, difference of color in tho 

 sexes of, i. 357. 



Ortiioptera, i. 341 ; metamorphosis of, i. 

 2S2; stridulating. auditory apparatus of, 

 i. 343; colors of, i. 349; rudimentary 

 stridulating organs in female, i. 349; 

 strkiulation of the, and Homoptera, dis- 

 cussed, i. 349. 



Ortygomis gularis, pugnacity of the 

 male, ii. 42. 



Oryctes, stridulation of, i. 369 ; sexual dif- 



of 



n. 



ferences in the stridulant organs of, i 

 371. 



Ori/x leucoryx, use of the horns of, ii. 239 

 251. 



Osphranter rufus, sexual difference in thi 

 color of ii. 272. 



Ostrich, African, sexes and incubation of 

 the, ii. 196. 



Ostriches, stripes of young, ii. 176. 



Otaria jubata, mane of the male, ii. 255. 



Otaria nigrescens, difference in the colora- 

 tion of the sexes of, ii. 273. 



Otis Bengalensis, love-antics of the male, 

 ii. 65. 



Otis tarda, polygamous, i. 261 ; throat- 

 pouch of the male, ii. 55. 



Ouzel, ring, colors and nidification of the, 

 ii. 171. 



Ouzel, water, colors and nidification 

 the, ii. 162. 



Ovibos moschatus, horns of, ii. 236. 



Ovipositor of insects, i. 246. 



Otis cycloceros, mode of fighting of, 

 238. 



Ovule of man, i. 14. 



Owen, Prof., on the Corpora "Wolffiana, i. 

 16; on the great-toe in man, i. 16; on 

 the nictitating membrane and semilunar 

 fold, i. 23; on the development of the 

 posterior molars in different races of 

 man, i. 26 ; on the length of the caecum 

 in the Koala, i. 26 ; on the coccygeal ver- 

 tebrae, i. 29; on rudimentary structures 

 belonging to the reproductive system, i. 

 30; on abnormal conditions of the hu- 

 man uterus, i. 119; on the number of 

 digits in the Ichthyopterygia. i. 120 ; on 

 the canine teeth in man, i. 121 ; on the 

 walking of the chimpanzee and orang, i. 

 134; on the mastoid processes in the 

 higher apes, i. 138 ; on the hairiness of 

 elephants in elevated districts, i. 143 ; on 

 the caudal vertebrae of monkeys, i. 144; 

 classification of mammalia, i. ISO; on 

 the hair in monkeys, i. 186; on the pis- 

 cine affinities of the Ichthyosaurians, i. 

 196 ; on polygamy and monogamy among 

 the antelopes, i. 258; on the horns of 

 Antilocapra Americana, i. 2S0 ; on the 

 musky odor of crocodiles during the 

 breeding-season, ii. 27; on the scent- 

 glands of snakes, ii. 29 ; on the Dugong, 

 Cachalot, and Ornithorhynchits, ii. 231 ; 

 on the antlers of the red-deer. ii. 241 ; on 

 the dentition of the Camelidoe, ii. 246; 

 on the tusks of the Mammoth, ii. 247 ; 

 on the horns of the Irish elk, ii. 247 ; on 

 the voice in the giraffe, porcupine, and 

 s>tag. ii. 261 ; on the laryngeal sac of the 

 gorilla and orang, ii. 263 ; on the odorifer- 

 ous glands of mammals, ii. 266, 267 ; on 

 the effects of emasculation on the vocal 

 organs of men. ii. 314 ; on the voice of 

 HylobaMs agilis, ii. 316; on American 

 monogamous monkeys, ii. 345. 



Owls, white, new mates found by, ii. 100. 



Oxynotus, difference of the females of twf 

 species of, ii. 184. 



