420 



INDEX. 



Onitis fureifer, procosses of anterior fem- 

 ora of tlie male, and on the bead and 

 thorax of the female, i. 361. 



Onthojihtigim. i. 860. 



Oiit/iiip/i(i(/ii.n ninffi/er, sexual dilTerence.s 

 of, i. 85S ; variation in the horns of the 

 male, i. 860. 



OniiDiA, sexual differences ot ii. 27. 



Opossum, wide range of; in America, i. 

 211. 



Optio nerve, atrophy of the, caused by de- 

 struction of the eye. i. 112. 



OK.VNG-OfTAN, ii. 308: IJisclioff on the 

 agreement of the brain of the, with that 

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

 oars of the, i. 21 ; vermiform appcndatre 

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

 alarmed at tile sijrht of a turtle, i. 41 ; 

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

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

 danus as a night covering, i. 51 ; hands 

 of the, 1. 134; absence of mastoid pro- 

 cesses in the, i. 135; direction of the 

 hair on the arms of the, i. 1^5; its aber- 

 rant characters, i. ISS ; supposed evolu- 

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

 monogamous habits of the, Ii. 345 ; male, 

 beard of the, ii. 2T0. 



ftR ant.es, treatment of by monkeys, i.l34. 



Orax<;i;-tip butterfly, i. 3T6, 3Sl. 



Orclientia Darwinii, dimorphism of males 

 of, i. 322. 



Orche«tia Tuciiratinga, limbs of; i. 320, 

 32T. 



Obdeai, i. 66. 



OreuH canna, colors of. ii. 274. 



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



Organs, prehensile, i. 24S; utilized for 

 new jmrposos. ii. 319. 



Orgaxio scale. Von IJaer's definition of 

 jirogress in, i. 2(W. 



Orioi.ks. nidilication of, ii. 160. 



OrioliiM, siiecies of, breeding in immature 

 plumage, ii. •i^\h, 200. 



Orio/iiJi jiie/ii/iocephaliis, coloration of tlie 

 sexes in, ii. 170. 



Ornaments, prevalence of similar, i. 224 ; 

 fondness ot savages for, ii. 324 ; of male 

 birds, ii. 47. 



Ornamental characters, equal transmis- 

 sion of, to both sexe.s, in mammals, ii. 

 2S;i; of monkeys, ii. 291. 



Ornitlwptera <'ra'«us, i. 301. 



Ornithorhynchw), i. 192; spur of the 

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



Orocete« eri/throga^tra, young oi; ii. 210. 



Orront, Grotto of i. 28. 



Orsodacna atra, dilference of color in the 

 sexes of; i. 367. 



Ortuoptera, i. !341 ; metamorpho.sis of, i. 

 2S2 ; stridulating, auditory ajiparatus of, 

 1. 8+B; colors of, i. 349; rudimentary 

 stridulating organs in female, i. 349; 

 stridulation of the, and Homoptei-a, dis- 

 eu.ssod, i. 349. 



OrtyyorniH ffiilarU, pugnacitv of the 

 male, ii. 42. 



Ortjctes, stridulation of, i. 869 ; sexual dif- 



ferences in the stridulant organs ot i. 

 871. 



Orifr leucori/x, use of the horns of, ii. 289. 

 251. 



Osphranter rii/us, sexual difTerence in the 

 color of, ii. 272. 



Ostrich, African, sexes and incubation of 

 the, ii. 196. 



Ostriches, stripes of young, ii. 176. 



Otdria jnhatu. mane" of the male, ii. 255. 



Otdria iiiyreMct'ii-n. difference in the colora- 

 tion of the sexes ot; ii. 273. 



OtiM Bengaleim*, love-antics of the male, 

 ii. 6.J. 



Otis tarda, polygamous, i. 261 ; throat- 

 pouch of the male. ii. 55. 



OuzEi. ring, colors and nidificatlon of the, 

 ii. 171. 



Ouzel, water, colors and nidiflcation of 

 the, ii. 162. 



Ovibos moschatitfi, horns of, ii. 236. 



Ovipositor of insect.s. i. 246. 



OviH cycloceros, mode of fighting of, ii. 



OvrLE of man. i. 14. 



Owen, Prof., on the Corpora Wolfflana, 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, 1. 26; on the length of the cjecum 

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

 tebrae, i. 29; on rudimentary structures 

 belonging to the reproductive system, i. 

 80; on abnormal conditions of the hu- 

 man uterus, i. 119: on the number of 

 digits in the Ichthyopterygia. i. 120; on 

 the canine teith in man." i. 121 ; on the 

 walking of the chimpanzee and orang. i. 

 134; on the mastoid processes in the 

 higher apes, i. 13S; on the hairiness of 

 elephants in elevated districts, i. 143; on 

 the caudal vertebrse of monkeys, i. 144; 

 classification of mammaha, i. IsO; on 

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

 cine affinities of the Ichthyosaurians, i, 

 196 ; on polygamy and monogamy among 

 the antelopes, i. 25S: on the horns of 

 Antilocdpra Americana, i. 230 ; on the 

 musky odor of crocodiles during the 

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

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

 Cachalot, and OrnitAor/ii/ncAiis, ii. 23i ; 

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

 the dentition of the Camelida', 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 

 stag. ii. 261 ; on the laryngeal sac of the 

 gorilla and orang, ii. 2(W ; on the oiiorifer- 

 ous glonds of mammals, ii. 2t)6. 267 : on 

 the effects of emasculation on the vocal 

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

 Jlylobatix ay it is, ii. 316; on Aiiicrican 

 monogamous monkeys, ii. 845. 



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



Oje)/notit«. difference of the females of two 

 species of; ii. 1S4. 



