290 



INDEX 



Septomaxillary, 49 



Sesamodon, 50 



Shark, teeth of, 33 * 



Sheep, 210 



Shelf, Continental, 25 



Shrew, Tree, 100 



Shrew, West African Water, 101 



Simplieidentata, 188 



Sirenia, 223 



Sirenia, ancestry of, 224 



Skull, aquatic adaptation of, 203 



Skull, effects of loss of teeth on, 1G8 



Skunk, 180 



Sloth, 164 



Spalacotheriura, 56 



Specialized, definition of, 30 



Species formation, 94, 281 



Spider-monkey, White-bellied, 118 



Squirrel, Flying, Marsupial, 79 



Squirrels, 188 



"Star," 218 



Stegodon, 222 



Stegotherium, 166 



Suidae, 201 



Talon, 60 



Talonid, 59 



Talpa europea, 97 



Tapir, 213 



Tapir, successive dentitions of, 214, 



253 

 Tarsiidae, history of, 108 

 Tarsipes, 91 

 Tarsius borneanus, 110 

 Tasmanian Devil, 72 

 Tasmanian Race, 147 

 Tasmanian Wolf, 74 

 Taurodontism, 140, 146 

 Teeth, attachment of, 36 



canine, evolution of 36 



change in position of in jaw, 278 



effects of loss of, on skull, 168 



evolution of function of, 37 



hinged, 35 



origin of, 33 



palatine, 35 



pharyngeal, 34 



progression in, 269 



replacement of, by horny epithe- 

 lium, 40, 237 



subdivision of, 38 



successional, 33 



Vomerine, 34 



Tetrabelodon, 222, 



Thalacomys, migration of metacone 



in, 78^ 

 Thalacomys minor, 76 

 Theria, definition of, 65 

 Therocephalia, characters of, 45 



period of, 45 

 Thylacinus cynocephalus, 74 

 Tri angle, reversed, theory of, 57 

 Triassic ancestors of Mammals, 46 

 Triassic, Mammals of, 53 

 Trichosurus vulpecula, 82 

 Triconodon, 55 

 Triconodonts, 55 

 Trigon, 57 

 Trigonid, 57 

 Trituberculates, 58 

 Trituberculate type, dominance of, 



92 

 Trituberculy, theory of, 57 

 Tupaia, 100 



Tupaia, relation of, to Primates, 101 

 Tupaia tana, 101 

 Tvlopoda, 204 



U 



Ursidae, 183 



Vespertilio fuscus, 230 

 Viverra, 176, 270 



Viverridae, Progression in tooth 

 forms of, 270 



W 



Wallaby, Bennett's, 86 



Wallace's Line, 26 



Walrus, 186 



Wart Hog, 279 



W'edge Theory, 62 



Whales, ancestry of, 234 



Whales, Toothed, 233 



Whales, Whalebone, 233 



Wisdom tooth, position of, 151 



"Wolf" tooth, 216 



Wolves, 174 



Wombat, 90 



Wood-chuck, 189 



Zalambdodonts, 96 

 Zalophus, 185 



