_Centetes_, _49_; caudal vertebrae, 454; pelvic symphysis, 515; spines, 417; teeth, 440; thoraco-lumbar vertebrae, 450 Centetidae, _49_; auditory ossicles, 488; skull, 480 Centrale, 27; see Carpus and Tarsus Centre of motion, 448 Centrum, 14 _Cephalaspis_, _31_, _55_ Cephalic shield, armadillos, 419 _Cephalochordata_, _30_, 51 _Cephalodiscus_, _30_, 50 _Ceratodus_, _34_, _70_; branchial arches, 124; cranium, =125=; skeleton, =128=; skull, 117, 124; spinal column, 113; teeth, 111 Cerato-branchial, cod, 101; dogfish, 78; duck, 320; salmon, 95 Cerato-hyal, 23; cod, 100; dog, 399; dogfish, 78; salmon, 95 _Ceratophrys_, _36_; bony plates of, 168; teeth, 170 _Ceratops_, _39_; see _Polyonax_ Ceratopsia, _39_; characters, 209; premaxillae, 284 Ceratopsidae, _39_ _Ceratosaurus_, _38_, 208; supratemporal fossae, 283; _C. nasicornis_, skeleton, =206= Cercopithecidae, _49_, _373_ Cervical ribs, crocodile, 260; reptiles, 285 Cervical vertebrae, crocodile, 239; dog, 380; duck, 307; general characters, 15; mammals, 442; turtle, 219 Cervidae, _46_; skull, 469 _Cervulus_, _46_; pes, 523 _Cervus_, 46; _C. megaceros_, antlers, 469 _Cestracion 32_; calcification of vertebrae 114; external branchial arches 121; pectoral fin 130; skull =118=; suspensorium 119; teeth 109; vertebral column 114 Cestraciontidae _32_ Cetacea _44_, 522; arm bones 501; auditory ossicles 487; caudal vertebrae 453; cervical vertebrae 444; characters 353; exoskeleton 416 f.; hind limb 518; manus 505; pectoral girdle 495; pelvis 514; position of limbs 28; ribs 491; skull 461 f.; sternum 489; teeth 426; thoraco-lumbar vertebrae 448 Cetiosauridae _38_ _Chalcides_ _38_; limbs 289 Chalicotheriidae _46_; femur 519; manus 509 _Chalicotherium_ _46_; femur 360; pes =508=, 525; teeth 432 _Chamaeleon_ _38_, 199 f.; epipubis 293; ilia 291; manus 291; skull 278 Chamaeleonidae _38_ Charadriidae _42_ Charadriiformes _42_ _Chauna_ _41_; interorbital septum 333; ribs 336; _C. derbiana_, spurs 330 _Chelone_ _37_, _194_; plastron 271, =218=; see Turtle Chelonia _37_; beaks 271; carapace 271; general characters 193; humerus 290; limbs 290; palate 281; pectoral girdle 288; pelvic girdle 291; skull 277 f.; tarsus 293; vertebrae 275 f. Chelonidae _37_ Chelydae _37_ _Chelydra_ _37_; carpus 26, 291