702 



INDEX 



Olfactory tracts, 231 



Olfactory ventricle, 97* See Brain 



Olivary body, 458* 



Omentum, duodeno -hepatic, 313* 



Omentum, gastro -hepatic, 313* 



Omentum, great, 391 



Omosternum, 263, 264* 



Onychodactylus, 289 



Opercular, 193* 



Operculum, of Balanoglossus, 4 : Crani- 

 ata, 65 : Holocephali, 183, 184 : 

 Trout, 192, 193 : Teleostomi, 218 : 

 Dipnoi, 240, 241, 242 : Tadpole, 

 283 



Ophidia, 324*, 329, 332, 333, 336, 337, 

 338, 342, 345, 346, 347, 348, 349, 

 350, 351, 356, 357, 359 



Ophthalmic nerve, 101, 102, 155, 156 



Ophthalmicus profundus, 155 



Opisthoccelous vertebra, 222*, 289 



Opisthocomus, 403, 407, 408, 613 



Opisthotic, 77* See Skull 



Opossums, 464, 478, 480, 506, 507, 

 546, 565, 566, 579, 583 



Optic capsules, 73* 



Optic chiasma, 153 



Optic cup, 109* 



Optic foramen, 437, 438* 



Optic lobes, 98, 99* See Brain 



Optic nerve, 100, 101 



Optic thalamus, 98, 99* See Brain 



Optic ventricle, 98, 99* See Brain 



Optic vesicle, 109* 



Optoccele, 98, 99* See Brain 



Ora serrata, 106, 108* 



Oral cirri of Amphioxus, 43, 44*, 47 



Oral hood, 43, 44* 



Oral lobes of Doliolum, 26 



Oral siphon, 15*, 17 



Orang, 473, 535, 537, 538, 539, 540, 581 



Orbicular, of Rabbit, 441 



Orbit, 73* 



Orbito -sphenoid, 77* See Skull 



Oreo, 466 



Orca gladiator, 486 



Oriental region, 610 



Ornithorhynchus, 464, 475, 477, 478, 

 479, 502, 503, 504, 505, 506, 541, 545, 

 561, 562 



Orm'thorhynchus anatinus, 479, 561 



Ornithosauria See Pterosauria 



Orthagoriscus, 225 



Orthoceras, 619 



Orthogenesis, 645 



Orthotomus. 423 



Orycteropodidce, 465 See Cape Ant- 

 eaters 



Orycteropus, 509, 547, 609 



Orycteropus capensis, 485 



Os cloacae, 312* 



Os cordis, 558* 



Osmerus, 620 



Ossa innominata, 312* 



Ossicula audit us, of Rabbit, 441 



Ossification, centres of, 77, 542* 



Osteocranium, 78* 



Osteo -dentine, 84* 



Osteostraci, 255, 256 



Ostracion, 216 



Ostracodermi, 253*, 254, 255, 256 



Ostrich, 398, 399, 408, 409, 417, 419, 



422, 426, 429, 431, 432 

 OtariidoB, 470, 491, 580 

 Otis, 403 



Otocyst, 24, 29, 34 

 Otoliths, 111 

 Otters, 470, 491 

 Ovarian artery, 90 

 Ovarian vein, 91 

 Ovidce, 468, 608 See Sheep 

 Ovis aries, 523 

 Ovulists, 650 

 Owen, R., 660, 665 

 Owls, 404, 409, 417, 421, 432 

 Oxen, 468, 487, 553, 564, 579 

 Oyster-catchers, 403 



_L .EDOGENESIS IN AXOLOTL, 302 



Pachyprnis, 417 



Pacinian corpuscles, 103, 105* 



Palsearctic region, 608 



Palceohatteria, 359 



Palazoniscus macropomus, 237 



Palseontological evidence of evolution, 



626 



Palceospondylus gunni, 138, 139 

 Palamedea, 403 



Palate, hard and soft, 446, 553 

 Palatine, 77, 79* See Skull 

 Palatine nerve, 101, 102* 

 Palatine teeth, Holocephali, 186, 187 : 



Trout, 204, &c. : Ceratodus, 243 

 Palato-pterygoid, 243 

 Palato-quadrate, 74, 75*, 77 See Skull 

 Palinurits, 601 

 Pallas, 653 

 Pallium, 99* 

 Pancreas, 69, 85* See Digestive 



system 



Pancreatic juice, 85* 

 Pangenesis, 642 

 Panmixia, 634 

 Parachordals, 73* 

 Paraccele, 97* See Brain 

 Paracone. 544* 

 Paraconid, 545* 

 Paradiseidce, 404, 411, 429, 602 

 Parafibula, 508 

 Paramyxine, 134, 139 



