INDEX. 



551 



Plantigrade, defined 358 n. 



Plastron, Dermochelys 272; Che- 

 lone midas 217, 218, 271 



Platanistidae 45 



Platanista 45, cervical vertebrae 

 444 ; skull 464 



Plectognathi 33 ; vertebrae 115 



Plectroptertis 41 ; P. gambensis, 

 spur 330 



Plesiosauridae 37; limbs 193 ; para- 

 sphenoid 192 ; skull 278 



Plesiosaurus 37, 193 ; position of 

 limbs 28 



Pleuracanthidae 63 ; fins 115 



Pleurodira 37-, general characters 

 195 



Pleurodont, 159, 199, 273 



Pleuronectidae 33 



Pleuropterygii 31, 63 



Pliosaurus 37, 193 



Plovers, 42, 334 ; thoracic verte- 

 brae 332 



Pneumaticity of bird's skeleton 331 



Polacanthus 39', exoskeleton 272 



Pollex 26 ; see Manus 



Polyodoji 32, 104 ; distribution 66 ; 

 pectoral fins 131; skull 122; 

 spinal column 112 ; teeth 110 



Polyodontidae 32 



Polyonax 39, 209; beak 271; 

 frontals 277; jaw 274 ; predentary 

 284 



Polyprotodont 423 



Polyprotodontia 43', general cha- 

 racters 350 



Polypteridae 33 



Polypterus 33, 68 ; distribution 66 ; 

 exoskeleton 67; pectoral fins 

 131 ; pelvic fins 132 ; pelvis 

 127 ; scales 104 ; skull 122 ; tail 

 116 



Pontoporia 45; cervical vertebrae 

 444; teeth 426 



Porcupine 47; pes 526; skull 476, 

 477 ; spines 417 



Porpoise 45, 357; thoraco-lumbar 

 vertebrae 448 



Postaxial 28 



Posterior cornu, duck 320; turtle 

 231; limb 26; Amphibia 188; 

 birds 341 ; dog 412 ; duck 326 ; 

 frog 166; newt 149, 148 ; reptiles 

 293; turtle 235, 234 



Postfrontal 21 ; crocodile 250 ; 

 turtle 225 



Postorbital bar, crocodile 250, 

 255 f.; Hatteria 283; groove, 

 dogfish 76 



Post-temporal, cod 102 ; reptiles 

 283 ; bar, crocodile 256 ; Hat- 

 teria 283 



Potamogale 49, 367, 370; shoulder 

 girdle 499; teeth 440 



Potamogalidae 49 



Powder-down feathers 329 



Pre-axial 28 



Precoracoid 25 ; frog 163 ; newt 147 ; 

 reptiles 288 ; turtle 232 



Predentary, reptiles 284 



Predigital quill, duck 303 



Prefrontal 21 ; crocodile 249 ; rep- 

 tiles 278 ; turtle 225 



Prefronto-lachrymal, newt 141 



Prehallux, frog 167 f. 



Premaxilla 22; cod 98; crocodile 

 252; dog 398; duck 314, 318; 

 frog 158; newt 143; salmon 94; 

 turtle 230 



Premolar, dog 370, 377; mammals 

 344 



Prenasal process, frog 158 



Pre-orbital vacuity, reptiles 283 



Presphenoid 19 ; dog 388 



Prespiracular ligament, dogfish 77 



Presternum, dog 404 



Primaries, duck 303 



Primates 49; arm bones 503; au- 

 ditory ossicles 488 ; cervical ver- 

 tebrae 446; general characters 

 372; manus 512; pelvis 515; 

 pes 527; ribs 493; sacrum 452; 

 shoulder girdle 499 ; skull 482 f . ; 

 sternum 490 ; tail 454 ; teeth 

 441 ; thigh and shin 520 ; thora- 

 co-lumbar vertebrae 450 



Priodon 44 ; caudal vertebrae 453 ; 

 manus 505 ; stapes 487 ; sternum 

 489 ; teeth 424 



Pristidae 32 



Pristis 32; snout or rostrum 109, 

 119 



Proboscidea 47; arm bones 502; 

 cervical vertebrae 445 ; general 

 characters 364 ; femur 519 ; ma- 

 nus 511; pelvis 514; pes 526; 

 scapula 497; skull 473; teeth 



