548 



INDEX. 



Newt 35 ; anterior limb 147 ; hyoid 

 apparatus or visceral arches 144, 

 181 ; pelvic girdle 149 ; ribs 

 145 ; shoulder girdle 146 ; skull 

 140 ; sternum 145 ; vertebral 

 column 138 



Notidanidae 31 ; calcification of 

 vertebrae 114; pectoral fins 130; 

 vertebral column 113 ; visceral 

 arches 63, 119 f. 



Notochord, Amphioxus 52 ; Balano- 

 glossusSO; dogfish 72; Tunicates 

 51 



Nothosaurus 37, 193; supratemporal 

 fossae 283 



Nothosauridae 37 



Notoryctes 43 ; arm bones 500 ; 

 caudal vertebrae 453 ; cervical 

 vertebrae 443 ; claws 418 ; dental 

 formula 423 ; manus 504 ; pelvis 

 513 ; pectoral girdle 494 ; pes 

 521; ribs 491; sacrum 452; 

 skull 457 ; sternum 489 ; thigh 

 and shin 517 



Notoryctidae 43, 350 



Nuchal plate, turtle 215 ; shield, 

 crocodile 238 ; turtle 214 



Nyrania 35] palatines 177 



Occipital condyle, crocodile 246 ; 

 dog 386; duck 315; frog 154; 

 turtle 224 ; crest, dog 386 ; 



segment, crocodile 246; dog 

 384 ; turtle 224 



Odontaspis 32 ; succession of teeth 



1O7 



Odontoblast 7 

 Odontoceti 44; general characters 



357 ; manus 505 ; pectoral girdle 



495; skull 462; sternum 489; 



teeth 426 

 Odontolcae 40 ; general characters 



299 



Odontopteryx 40; jaws 334 

 Ogmorhinus 48; mandibular ramus 



439 

 Olecranon process, dog 406; duck 



323 ; frog 164 

 Olfactory capsule, see nasal capsule ; 



cavity, dog 388 ; chamber, 

 dog 395 ; fossa, dog 390 



Omosaurus, exoskeleton 272 



Omosternum, frog 163 



Onychodactyliix 35 ; nails 168 



Operculum, cod 101 ; salmon 95 



Ophidia 38 ; general characters 202 ; 

 jaw bones 280 ; scales 270; skull 

 277 f. ; vertebral column 275 



Opliisaurus 38; limbs 289; pectoral 

 girdle 289 



Opisthocoelous, defined 14 



OpistJiocomus 41 ; skull 334 



Opisthotic 20 ; cod 96 ; crocodile 

 250 ; salmon 89 f. ; turtle 227 



Opossum 43; caudal vertebrae 453; 

 teeth 423 



Optic capsule 20 ; crocodile 251 ; 

 dog 394 ; turtle 228 



Orang 49; carpus 512; ribs 493; 

 thoraco-lumbar vertebrae 450 



Orbit, crocodile 257 ; dogfish 74 ; 

 duck 317 



Orbital ring, cod 97 ; salmon 93 



Orbitosphenoid 19 ; dog 388 ; duck 

 317 ; newt 141 



Orca 45 ; teeth 427 



Oreodon 45 ; see Cotylops 



Ornithodelphia 42 ; general charac- 

 ters 346 



Ornithosauria 212 



Ornithorhynchidae 43 



Ornithorhynchus 43; beak 3, 418; 

 caudal vertebrae 453 ; manus 

 504; pelvis 513; sacral vertebrae 

 451; shoulder girdle 347; skull 

 455 ; spur 418 ; tarsus 27 n. ; teeth 

 4, 346, 422 ; thoraco-lumbar ver- 

 tebrae 447 



Ornithopoda 39 ; general characters 

 209 



Orthopoda 39 ; general characters 

 208 ; pubes 292 



Orycteropodidae 44 ; teeth 425 



Orycteropus 44 ; hair 416 ; manus 

 505 ; pectoral girdle 495 ; pelvis 

 513; skull 459 ; see Aard Vark 



Osborn, H. F., on Mesozoic Mam- 

 mals 348 



Os entoglossum, duck 320 



Osteoblast 11 



Osteoclast 11 



Osteodentine 108 



Osteostraci 31 ; general characters 

 54 



Ostracion 33, 69 ; plates 105 



