684 
Onychoprion ancesthetus, 244, 252. 
Opisthocomus cristatus, on the myology of, by J. 
Beswick Perrin, 353. 
—— ——, caudal muscles of, 360. 
—— ——, muscles of the cubit of, 358. 
—— ——,, muscles of the leg of, 361. 
——— —_—, muscles on the superior border of the 
radius of, 359. 
, pectoralis magnus of, 354. 
, the ventral muscles of the tail of, 360. 
Orcus amadis, 564. 
Oreus acteus, 548. 
elpenor, 554, 
—— licastus, 539. 
porcus, 561. 
thorates, 540. 
Orgya luctuosa, 193. 
Oriolus acrorhynchus, 185, 186. 
flavus, 206. 
—— formosus, 186. 
furcatus, 181. 
—— galbula, 186. 
lineatus, 224. 
melanocephalus, 186. 
—— ocellatus, 224. 
philippensis, 186, 250. 
ruber, 206, 
Orneus enopion, 622. 
Orpheus melanotis, 471. 
parvulus, 472. 
—— trifasciatus, 471. 
Orthotomus castaneiceps, 195, 250. 
—— derbianus, 195, 250. 
Ortygis ocellata, 224. 
Ortygometra cinerea, 230, 251. 
eurizona, 231. 
ocularis, 231. 
Oryba robusta, 605. 
Oryzoborus crassirostris, 485. 
torridus, 485. 
Osmotreron aromatica, 211. 
—— axillaris, 211, 251. 
—— batilda, 214. 
—— phayrei, 212. 
-—— vernans, 210, 251. 
Osphranter robustus, 425. 
Otis arabs, 225, 226. 
—— galapagoensis, 493. 
INDEX OF SPECIES. 
Otis kori, 225, 226. 
lugoniensis, 225. 
—— nigriceps, 226. 
—— philippensis, 144. 
secretarius, 141. 
Otus cheerilus, 545. 
cnotus, 546. 
myron, 546, 631. 
pholus, 546. 
syriacus, 545. 
versicolor, 546. 
Ourax erythrorhynchus, 283. 
galeata, 285. 
mitu, 283. 
pauxi, 285, 
tomentosa, 284. 
On Dinornis (Part XX.): con- 
taining a restoration of the skeleton of Cne- 
miornis calcitrans, Ow., with remarks on its 
affinities in the Lamellirostral group, 253. 
On the Osteology of the Marsupialia.— 
(Part V.), Fam. Poephaga, Genus Macropus, 
417. 
Oxycerca jagori, 208, 251, 
Puchycephala fusca, 338, 352. 
Pachygonia abboti, 534, 
boisduvalii, 633. 
caliginosa, 533, 635. 
coffee, 533, 534. 
hopfferi, 635. 
magna, 534, 
subhamata, 533. 
Pachylia achemenides, 627. 
equivalens, 622. 
—— fieus, 578. 
inconspicua, 579. 
inornata, 578. 
—— kadeni, 622. 
—— molucea, 578. 
Owen, Professor. 
—— reswmens, 579. 
—— syces, 578. 
—— undatifascia, 578. 
venezuelensis, 578. 
Padda oryzivora, 207, 251. 
Palewornis calthrope, 138. 
-—— cyanocephalus, 138. 
—— eupatrius, 138. 
gironniert, 138. 
