INDEX TO GENERA. 



319 



Plionema 51 



Plochelsea 271 



Polorthus 259, 261 



Pomatiopsis 115 



Populus 46 



Portheus 280 



Proteus 43 



Pteromeris 51 



Ptyckomya 50 



Pulvinites 217 



Pupa 104 



Puppigems 15 



Pycnodus 163 



Pygoscelis 190, 195 



Pythina 232 



Quercus 126, 236 



Rangia 49 



Rhamphosaurus 141 



Rhinosaurus 141 



Rliiuocerus 38 



Rhus 46 



Rhynchotherium 143 



Rubus 126 



Salix 46 



Salmo 163 



Saurocephalus 281 



Scacchia 93 



Scambula 51 



Scintilla 223 



Sequoia 10 



Solemya 258 



Somatogyrus i 104 



Spkaerium 104, 109 



Spheniscus 181, 207 



Stauremys 23, 28 



Succinea 105, 111 



Teredo 259 



Tellimya 228 



Testudo 22, 268 



Thecalia 257 



Thecachampsa 17 



Tbecodouta 230 



Thetis 274 



Thujopsis 36 



Titanotherium 38 



Trionyx 22, 267 



Trogosus 37 



Thuja 33 



Thyreopsis 223 



Trigonoarca 54 



Tylosteus 40 



Trypanosoma 106, 111 



Uintacyon 277 



Uintamastix 109, 241 



Uintatherium 169, 277 



Ungulina 92 



Unio 106, 108, 155 



Valvata 106 



Vanellus 32 



Vermetus 259 



Vertigo 107 



Vetericardia 52 



Vitrina 107 



Vi vipara 107 



Wistaria 239 



Woodia '. . . 84 



Zonites 135 



Zua 107 



