452 
ORYX. 
INDEX. 
PALLAS. 
differences in the stridulant organs 
of, i. 383. 
Or'yx leucoryx, use of the horns of, ii. 
251, 263. 
Osiphranter rufus, sexual difference in 
the colour of, ii. 286. 
OsTRiCPi, African, sexes and incuba- 
tion of the, ii. 205. 
Ostriches, stripes of young, ii. 184. 
Otaria juhata, mane of the male, ii. 
267. 
Otaria nigrescenSj difference in the 
coloration of the sexes of, ii. 287. 
Otis bengalensis, love-antics of the 
male, ii. 68. 
Otis tarda, polygamous, i. 269; throat- 
pouch of the male, ii. 58. 
Ouzel, ring-, colours and nidification 
of the, ii. 179. 
Ouzel, water-, colours and nidifica- 
tion of the, ii. 170. 
Ovibos moschatus, horns of, ii. 247. 
Ovipositor of insects, i. 254. 
Ovis cycloceros, mode of fighting of, 
ii. 249. 
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 mo- 
lars in different races of man, i. 26 ; 
on the length of the coecum in the 
Koala, i. 27 ; on the coccygeal ver- 
tebrae, i. 29 ; on rudimentary struc- 
tures belonging to the reproductive 
system, i. 31 ; on abnormal condi- 
tions of the human uterus, i. 123 ; 
on the number of digits in the 
Ichthyopterygia, i. 125 ; on the 
canine teeth in man, i. 126; on 
the walking of the chimpanzee and 
orang, i. 139 ; on the mastoid pro- 
cesses in the higher apes, i. 143 ; 
on the hairiness of elephants in 
elevated districts, i. 149 ; on the 
caudal vertebrae of monkeys, i. 
150 ; classification of mammalia, 
i. 187 ; on the hair in monkeys, i. 
194 ; on the piscine affinities of the 
Ichthyosaurians, i. 204 ; on poly- 
gamy and monogamy among the 
antelopes, i. 267 ; on the horns of 
Antilocapra americana^ i. 289 ; on 
the musky odour of crocodiles 
during the breeding season, ii. 29 ;: 
on the scent-glands of snakes, ii. 
30 ; on the Dugong, Cachalot and 
Ornithorhynchus, ii. 242 ; on the 
antlers of the red deer, ii. 252 ; on 
the dentition of the camelidae, ii. • 
257 ; on the tusks of the Mam- 
moth, ii. 258 ; on the horns of 
the Irish elk, ii. 259 ; on the voice 
in the giraffe, porcupine, and stag, 
ii. 274; on the laryngeal sac of 
the gorilla and orang, ii. 276 ; on 
the odoriferous glands of mammals, 
ii. 279, 280 ; on the effects of emas- 
culation on the vocal organs of 
men, ii. 330 ; on the voice of Hylo- 
bates agilis, ii. 332 ; on American 
monogamous monkeys, ii., 362. 
Owls, white, new mates found by, ii.. 
105. 
Oxynotus, difference of the females of 
two species of, ii. 193. 
P. 
Pacliydermata, i. 268. 
Paget, on the abnormal develop- 
ment of hairs in man, i. 25 ; on 
the thickness of the skin on the 
soles of the feet of infants, i. 118. 
Painting, i. 232. 
Falxmon, chelse of a species of, i. 331. 
Palseornis, sexual differences of colour 
in, ii. 231. 
Falxornis javanicus, colour of beak 
of, ii. 179. 
Falxornis rosa, young of, ii. 188. 
Falamedea cornuta, spurs on the wings 
ii. 47. 
Paleolithic period, i.M83. 
Palestine, habits of the chaffinch in, 
i. 307. 
Pallas, on the perfection of the 
senses in the Mongolians, i. 119 ; on 
the want of connexion between cli- 
mate and the colour of the skin, i. 
241 ; on the polygamous habits of 
Antilope Saiga, i. 267 ; on the 
lighter colour of horses and cattle 
in winter in Siberia, i. 282 ; on the 
tusks of the musk-deer, ii. 256, 
258 ; on the odoriferous glands of 
mammals, ii. 279 ; on the odorife- 
