INDEX OF SUBJECTS 



353 



Tapir, first, 312 



of Sumatra, 8 



teeth of, 100, 103, 226 

 Tapirus Baivdi, 205 

 Tatus, the, 224, 316 

 Teeth, evolution of, 100 



modifications of, 210, 211 



of hares, 135 



of Lophiodontidce, 200 



of Vertebrates, 225-7 

 Teleosauridce, 299 

 Temperature, its influence on 



migration of animals, 284 



of Archean rocks, 334 

 Tentaculites, 165 

 Terebratulae (Brachiopods), 159 

 Tertiary lines, History of, 310- 



3ii 

 "Test" of Echinoderms, 97 



of Molluscs, 130, 144 

 Tetracorals, the, 71 

 Thecodontosaurus, 299 

 Theriodesmus, 250, 305 

 Theromorphs, 84, 85, 168, 296, 



305 



Thylacoleo, 173 

 Tiger, Cuvier on, 13 

 Tillodonts, 174, 308 

 Tissotia (Ammonite), 220 

 Tttanosaurus, 236, 298, 303 

 Titanotherium, 212, 236 

 Tragoceros (genus of Ante- 

 lopes), 91 

 Transformist hypothesis, 122, 



etc. 



Transitional forms, absence of 

 a difficulty in Darwinian 

 theory, 74, 292 



Arch&opteryx, 74, 113 



(supposed) between Eden- 

 tata and Ungulata, 153 



Horse, 72, 104 



total absence in certain 

 cases, 1 06 



Tragultdez, 313 

 Triceratops, 211, 300 

 Trichotropis borealis, 287 

 Trigonia (Lamellibranch), 8, 



21, 159, 163, 194 

 2 A 



Trilobites, 50, 71, 95, 165-6 



Bergeron on, 144 



Cambrian, 327 



evolution of families of, 165 



extinction of, 267 



peculiar to Primary Era, 

 320, 324 



pre-Cambrian, 331 



Silurian, 320-1 

 Trinominal nomenclature (e.g. 



Helix striata pr&matura), 133 



Tritylodon, 250, 305 



Trochus, 159, 273 



Trophon antiquum, 287 



Tulotoma, 272 



Tunicates, derived from primi- 

 tive forms analogous to Ver- 

 tebrates, 51, 82 



Haeckel on, 46 

 Turbellarian worm stage of 



Haeckel, 55 



Turbinolia (Polyp), 227 



Turbo, 273 



Turritella, 159 



Turtles, giant land, 271 



Tylopoma, 272 



Types (persistent), Inverte- 

 brate, 256 



Vertebrate, 255 

 Typothorax, 300 



UMBRELLA, 228 



Uncites (Brachiopod), 165 



Unguiculates, Haeckel on, 54 



Lamarck on, 31 

 Ungulates, Anthracotherides fa- 

 mily, 175 



Haeckel on evolution of, 53 



Lamarck on, 31 



limbs, transformation of, 

 Kowalevsky and Cope on, 

 207 



PavidigitatcB and Impari- 

 digitatce, 53, 103 



possible ancestry of, 251 



Riitimeyer on milk-teeth of, 

 263 



Sirenians, as early terres- 

 trial forms, 208 



