INDEX 207 



Tufa, 9 



Tukeman, killing of the Mammoth, 145, 155 



Tylosaurus, 38* 



Tyrannosaurus, 188; skull of, 94* 



Variation in animals, 179 

 Vertebrates, oldest, 13 

 Vestigial structures, 161 

 Volcanic outbursts, 181 



Webster, F. S., on destruction of gar pikes, 16 

 White, C. A., on the nature and uses of fossils, 10 

 White Shark, 47 

 Wings, 51, 52,* 53 



of embryonic birds, 53 

 Wood, fossil, 6 

 Worm trails, 2, 23 



Yucca, fertilization, 184 



Zeuglodon, abundance of remains, 43 

 same as Basilosaurus, 44 

 description, 42, 45 

 habits, 43 



Koch's restoration, 44 

 name, 42 



once numerous, 43 

 size, 42 



specimen of, 49 

 structure of bones, 45 

 teeth, 43 



