INDEX 253 



Mosasaurs, range of, 49 



restoration, 52 * 



size of, 49, 50 

 Mylodon tracks at Carson City, 45 



Names, scientific, reasons for using, xvi, xvii 

 Nature, balance of, 238 

 Nuts, fossil, 11 



Oldest animals, 21 



vertebrates, 19, 22 

 Ostrich egg, 147 

 Over-specialization, 221, 222 



Peale, C. W., 205 



Peale, Rembrandt, 205, 206 



Pelican, mandible, 53 



Penguins, depend on fat for warmth, 127 



feathers highly modified, 128 



swim with wings, 80 

 Petrified bodies, 10 

 Phororhacos, description of, 149 



mistaken for mammal, 149 



Patagonian bird, 148 



related to heron family, 152 



restoration, fi-ontispiece 



skull, 150, 151 * 

 Protohippus, 166 

 Pteraspis, 28 



