$50 
Orbito-sphenoid 158 
Orchard oriole 407 
texas 407 
Order 72, 73 
jay 425 
olive-backed thrush 247 
snow-bird 378 
song sparrow 372 
robin 245 
ruffed grouse 585 
towhee 396 
Oreophasine 572 
Oreophasis derbianus 572 
Oreophilus totanirostris 597 
Organization, scale of 77 
Organs 
of circulation 195 
of digestion 209 
of generation 217, 219 
of locomotion 109 
of respiration 199 
of special senses 174 
Oriole 
audubon’s 410 
baltimore 408 
black-and-yellow 409 
black-headed 410 
bullock’s 409 
hooded 409 
orchard 407 
paris’ 409 
texas orchard 408 
Orioles 406, 407 
Ornithichnites 62 
Ornithium 443 
imberbe 444 
Ornitholite 63 
Ornithological book-keeping 22 
Ornithology defined 59 
Ornithoscelida 62 
Orortyx 591 
picta 591 
Oroscoptes 249 
montanus 249 
Ortalis 573 
vetula maccalli 573 
Ortolan 
(reed-bird) 401 
(sora or rail) 673 
Ortyx 589 
floridana 591 
texana 591 
virginiana 589 
Ortyxelos meiffreni 572 
Oscine podotheca 125 
Oscines 69, 239, 240 
Os 
humero-scapulare 145 
innominatum 148 
lacrymo-palatinum 165 
magnum 107 
prominens 108 
uncinatum 165 
Ospreys 556 
Osseous system 134 
Ossicles 
of ear 136 
of wing 108 
Ossicula auditiis 136 
Ossific centres 134 
Ossifraga 777 
gigantea 777 
Osteamcebee 149 
Osteological preparations 48 
Osteology 134 
INDEX. 
Osteoses 134 ¢ 
Ostrich, skull of 169 
Otahiti curlew 646 
Otic 
capsule 156 
ganglion 177 
Otidide 597, 665 
Otis tarda 210 
Otocrane 187 
Otogyps auricularis 519 
Otoliths 190 
Ouzel 255 
water 255 
Ovaries 45, 46, 215, 219 
Oven-bird 308 
Oviduct 220 
Ovisac 220 
Oviposition 223 
Ovulation 220 
Ovum 216 
Owl 
acadian 513 
american hawk 511 
american long-eared 507 
american wood 509 
arctic american saw-whet 512 
barn 502 
barred 509 
burrowing 56 
california screech 506 
california gnome 514 
eat 503 
colorado sereech 506 
day 511 
dusky horned 504 
elf 516 
european hawk 512 
ferrugineous gnome 514 
flammulated screech 506 
florida barred 510 
florida screech 106 
florida burrowing 517 
great gray 509 
great horned 503 
hoot 5038, 509 
kennicott’s screech 505 
lap 509 
little horned 505 
mottled 505 
red 505 
saw-whet 513 
screech 505 
short-eared 507 
snowy 510 
spectral 509 
texas screech 506 
western barred 510 
white horned 504 
Owls, 498, 500, 502 
barn 500, 501 
brown 508 
burrowing 516 
eared 507 
elf 515 
gnome 514 
gray 508 
great horned 503 
hawk 511 
hoot 503 
little horned 504 
marsh 507 
other 502 
pygmy 514 
saw-whet 512 
sereech 504 
snow 510 
Owls 
sparrow 514 
Ox-eye 598 
Oyster-catcher 
american 606 
black 607 
european 606 
Oyster-catchers 606 
PACIFIC 
bar-tailed godwit 636 
black-throated diver 791 
eider 712 
fulmar 778 
orange-crowned warbler 295 
Pagophila 749 
eburnea 749 
Painted 
bunting 391 
finch 391 
indigo 391 
lazuli 391 
purple 391 
finches 390 
flyeatching warbler 315 
geese 686 
goose 686 
longspur 358 
Paisano 474 
Palzoborus umbrosus 822 
Palzocycnus falconeri 682 
Palornithidee 495 
Paleornithinxw 495 
Paleospiza bella 822 
Paleotringa 
litoralis 828 
vagans 828 
vetus 828 
Palamedea cornuta 665 
Palamedeide 665 
cormorant 728 
gull 744 
rosy finch 352 
Palatal 
bones 163 
structure, types of 168 
Palate, hard 163 
Palatine bones 163 
Pale ring-neck 602 
Palm warbler 307 
Palmate foot 131 
Palmation 131 
Palpebree 97 
Pancreas 215 
Pandion 556 
haliaétus 556 
Panniculus carnosus 200 
Panyptila 456 
saxatilis 456 
Parabuteo 542 
Parachordal cartilage 151 
Paradise 
tern 766 
trogon 467 
Paragnathous bill 101 
Parasite 344 
Parasitic jager 736 
Parasphenoid 155, 159 
Parauchenia 96 
Paridx 263 
Paring 263 
Paris’ oriole 409 
Parietal bones 156 
Parovaria 215 
