INDEX TO GENERA. 



267 



Sylbeocyclus 212 



Symphemia 208 



Synbathocrinus 67 



Syuthliborharapus 211 



Syrrhaptes 199 



Tachypetes 200, 205 



Tadorna 217 



Tamias 3 



Tapirus 3 



Taxodium 178 



Thalasseus 214 



Thalassidroma 206 



Thalassoica 184, 212 



Thalassorais 218 



Thecachampsa 11, 192 



Thiellus 212 



Thoracosaurus 123 



Thorius Ill 



Thuja 122 



Tinamus 199 



Tretosphys 6, 7 



Trionyx 12, 66 



Tupaia 64 



Tardus 127 



Unio 124 



Uria 205, 211 



Ursus 3, 184 



TJrtica 136 



Utamania 211 



Xema 214 



Xylophaga 172 



Zarhachis 9 



Zeacrinus 138, 149 



Zonotrichia 126 



