332 



INDEX 



Operculum, gS 



of ear, iig 

 Ophidia, chondrocranium, 158 

 ribs, 44 

 skull, 158 

 vertebrae, 43 

 Ophisaurus, pelvis, 265 

 OpisthoccElous vertebrae, 22 

 Opisthotic, 70 

 Optic foramen, 61 



pedicel, 85 

 Orang-utan, skull, 219 

 Orbital fissure, 61 

 Orbitosphenoid, 61. 70 

 Oreodon, skull, 213 

 Origin of appendages, 241 



Mammals, 181, 203 

 Ornitholestes, skull, 169 

 Ornithorhynchus, pectoral girdle, 257 



pelvis, 273 

 Ornithostoma, pectoral girdle, 254 

 Orycteropus, cranium, 187, 207 

 Os basale, 129 

 calcis, 277 

 cloacas, 264 

 en ceinture, 132 

 entoglossum, 97 

 Priapi, 301 

 pubis, 231 

 thyreoideum, 127 

 transversum, 122, 140 

 triquetrum, 127 

 Ossicula auditus 119, 201 

 Ossification, 7 

 centres, 8 

 of skull, 68 

 Osteoblasts, 7 

 Osteolepis, skull, 103 

 Ostracoderms, scales, 10 



skull, 90 

 Ostrich, skull, 176 

 Otic bones, 70 

 capsule, 62 

 labyrinth, 62 



Paired appendages, 227 

 PalaeognathcB, 179 

 Palffiohatteria, skull, 163 

 Palaeospondylus, 27 



skull, 81 

 Palatal process, 87 



Palatine bone, 77 

 Palatobasal surface, 85 

 Palatopterygoid, 66 

 Palatoquadrate, 66 

 Panatylus, skull, 143 

 Pantodonta, skull, 215 

 Parachordal cartilage, 59 

 Paradoxical bone, 198 

 Paradoxurus, skull, 196 

 Paraglossal cartilage, 173 

 Paramastoid process, 92, 188, 196 

 Parapophysis, 19 

 Paraquadrate, 127 

 Paraseptal cartilage, 192 

 Parasphenoid, 77 

 Parasterna, 16 

 Parasuchia, skull, 166 

 Parieasaurus, pectoral girdle, 253 

 Parietal bone, 72 

 cartilage, 183 

 foramen, 73, 137, 139 

 fossa, 85 

 taenia, 137 

 Paroccipital bone, 93 



process, 188 

 Parotic process, 141 

 Patella, 277 



Pectoral appendages, 227 

 girdle, 228, 245 

 Amphibia, 246 

 Aves, 255 

 Mammalia, 256 

 Reptiles, 248 

 Pelvic appendages, 227 

 girdle, 228, 261 

 Amphibia, 262 

 Aves, 269 

 Mammalia, 271 

 Reptilia, 263 

 Penis bone, 301 

 Perichondrium, 6 

 Perilymph duct, 82 

 Periosteum, 7 

 Periotic bone, 70, 192 

 Perissodactyla, appendages, 297 



skull, 214 

 Perpendicular plate, 190 

 Pes, 275 



Petromyzon, skull, 80 

 Petrosal bone, 70, 125, 192 

 Petrotympanic fissure, 196 



