Owen, R., 191, 204, 210, 297, 348, 351, 420 Parker, T.J., 83, 96, 299 Parker, W.K., 16, 24, 53, 87, 154, 173, 200, 243, 465, 489 Pavlow, M., 358, 508 Pollard, H.B., 119 Poulton, E.B., 422 Pycraft, W.P., 297 Ridewood, W.G., 106, 164 Röse, C., 422 Sagemehl, M., 104 Schäfer, E., 11 Scott, W.B., 368 Seeley, H.G., 191, 212 Selenka, E., 40, 295 Shufeldt, R., 123 Smith, E. Noble, 11 Stirling, E.C., 423 Swirski, G., 103 Taeker, J., 427 Thomas, O., 349, 362, 370, 422, 424, 425 Tomes, C.S., 420 Traquair, R.H., 55, 58 Vogt, C., 297 Wiedersheim, R., 25, 134, 136 Wincza, H., 358, 495 Woodward, A. Smith, 34, 54, 58, 62, 127, 210 Wortman, J.L., 508 Wray, R.S., 303 Zittel, K.A. v., 36, 205, 212 INDEX. Every reference is to the page: words in italics are names of genera or species; figures in italics indicate that the reference relates to systematic position; figures in thick type refer to an illustration; _f._ = and in following page or pages; _n._ = note. Aard Vark, _44_, _352_; femur, 517; sacrum, 452; teeth, 425; see _Orycteropus_ Aard wolf, _48_; see _Proteles_ Abdominal ribs, crocodile, 260; reptiles, 286 Abdominal shield, turtle, 215 _Acanthias_, _32_; calcification of vertebrae, 114; pectoral fins, 130 _Acanthodes_, _32_, _64_ Acanthodii, _32_; general characters, 64; spines, 106 _Acanthomys_, _47_; spines, 417 Acanthopterygii, _34_ Accipitres, _41_ Acetabular bone, 25, 513; dog, 409 f.; frog, 165 Acetabulum, 25; crocodile, 266; dog, 409; duck, 324; frog, 165; newt, 149; turtle, 235 _Acipenser_, _32_, 117; exoskeleton, 67; distribution, 66; pectoral fins, 131; plates, 104; skull, 121, =122=; spinal column, 112 Acipenseridae, _32_ Acrodont, defined, 199; teeth of reptiles, 273 _Acrodus_, _32_; teeth, 109 Acromion, dog, 405 _Actinotrocha_, _30_; organ regarded as double notochord, 51 Ad-digital quill, duck, 303 Adjutant, _41_; clavicles, 338 Ægithognathous, 335 Æluroidea, _48_, _369_; teeth, 437 Æpyornis, _40_; tibio-tarsus, 341 Æpyornithes, _40_, _299_ Aftershaft, 328 _Agama_, _38_; teeth, 273 Agamidae, _38_; premaxillae, 284 Aglossa, _36_ Agouti, _48_; see _Dasyprocta_ Agriochoeridae, _45_ _Agriochoerus_, _45_; pes, 525 Ala spuria, duck, 304 Alcidae, _42_; see Auks Alisphenoid, 19; crocodile, 247; duck, 317; dog, 386