INDEX. 



553 



Neurankylus rximius, 94 

 Niobrara epoch, turtles of, 36 

 niobrarensis (Stylemys), 437 



(Testudo), 398, 437 

 nodosus (Taphrosphys), 105, 121 

 Notomorpha, 225, 226, 269 



garmanii, 269 



gravis, 269 



testudinea, 303 

 Number of species, 2 

 obscura (Compsemys), 235 

 obscurus (Emys), 235 

 obtusa (Testudo), 398, 458 

 obtusus (Eupachemys), 4<;8 

 octonarius (Hadrianus), 376 

 ocyrrhoe (Echmatemys), 298, 329 

 oedemia (Anostira), 479 

 oedemius (Plastomenus), 467, 479 

 ogmius (Basilemys), 226 



(Compsemys), 226 

 oregonensis (Stylemys), 392 



(Testudo), 392 

 Origin of turtles, 28 

 ornata (Anosteira), 279 



(Anostira), 279 

 ornatus (Chelone), 210 



(Glyptops), 47 



(Peritresius), 210 

 orthopygia (Testudo), 398, 438 



(Xerobates), 438 

 osborniana (Testudo), 398, 422 

 Osteology of turtles, 2 

 Osteopygis, 127 



borealis, 128, 141 



chelydrinus, 128, 136 



emarginatus, 128, 129 



erosus, 128, 138 



gibbi, 128, 132 



platylomus, 128, 129, 146 



ponderosa, 152 



repandus, 150 



robustus, 128, 134 



sopitus, 128, 141, 149 

 oweni (Emys), 386 



(Testudo), 386 

 oxysternum (Agomphus), 249, 256 



(Amphiemys), 256 

 pachylomus (Emys), 301, 302 

 Pachyrhynchus, 160 

 Pal<eotheca, 287, 343 



polycypha, 343 



terrestris, 344 



paludosa (Hoplochelys), 266 

 pansa (Testudo), 398, 420 

 parva (Emys), 246 

 parviscutatus (Chelone), 220 

 parviscutum (Chelone), 220 



(Puppigerus), 220 

 parvitecta (Chelone), 220 



(Chelonia), 220 

 parvitectus (Puppigerus), 220 

 pectorale (Pleurosternum), 254 

 pectoralis (Adocus), 254 



(Agomphus), 249, 254 

 Pelvis, structure of, 7, 9, 12, 14, 16, 21 

 pennata (Amyda), 511, 514 

 pennatus (Trionyx), 514 

 peragrans (Testudo), 398, 412 

 percrassa (Clemmys), 290, 294 

 Peritresius, 209 



ornatus, 122. 210 

 pertenuis (Testudo), 398, 454 

 pervicax (Glyptops), 54 

 petrolei (Emys), 352 



(Trachemys), 348, 352 

 petrosus (Adocus), 250 



petrosus (Agomphus), 249, 250 



(Emys), 250 



Phylogeny of turtles, 27, 28 

 Pierre epoch, turtles of, 36 

 planimentum (Chelone), 154 

 Plastomenidte, 466 

 Plastomenus, 466 



acupictus, 467, 470 



catenatus, 467, 470 



coalescens, 488 



communis, 467, 473, 481 



corrugatus, 467, 473 



costatus, 467 



fractus, 467, 472 



insignis, 467, 469 



lachrymalis, 467, 472 



leptomitus, 467, 470 



molopinus, 467, 481 



multifoveatus, 470, 474 



oedemius, 467, 479 



punctulatus, 467, 468 



serialis, 537 



tantillus, 467, 478 



thomasi, 467, 474, 476, 537 



trionychoides, 541 



visendus, 467, 476 

 Platemys sulcatus, 104, 106 

 Platychelys, 59 



platylomus (Osteopygis), 128, 129, 146 

 platyops (Euclastes), 162 



(Lytoloma), 160, 162 



(Rhetechelys), 162 

 Platypeltis, 483, 536 



amnicola, 536, 540 



antiqua, 536, 537 



extensa, 537, 545 



ferox, 11, 537, 548 



heteroglypta, 537, 543 



leucopotamica^ 537, 546 



postera, 537, 545 



serialis, 536, 537 



trepida, 536, 541 



trionychoides, 537, 541 

 Plesiochelyidae, 45 

 Plesiochelys belviderensis, 53 

 Plesiosauria, 30 



Pleurodira, 12, 19, 20, 25, 34, 43, 102 

 Pleurosternidae, 45 

 Pleurosternon, 46 

 Pleurosternum pectorale, 254 

 plicatulus (Compsemys), 47 



(Glyptops), 47 

 polemicus (Lembonax), 212 

 polycypha (Emys), 343 



(Paleeotheca), 343 

 Polythorax, 58, 100 



missuriensis, 100 

 ponderosa (Baena), 271 



(Catapleura), 152 



(Osteopygis), 152 

 Porthochelys, 180 



browni, 182 



laticeps, 1 80 



postera (Platypeltis), 537, 545 

 potens (Protostega), 189, 198 

 pravus (Adocus), 236, 242, 246 



(Emys), 246 

 Preneural bone, 57 

 princeps (Prochonias), 114 



(Taphrosphys), 114 

 prisca (Amyda), 511, 512 

 priscus (Trionyx), 512 

 Probaena, 58 



sculpta, 58 



procax (Toxochelys), 168, 176 

 Prochonias, 104 



