? 
INDEX 
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, frontispiece 
skull, 150, 151 * 
Protohippus, 166 
Pteraspis, 28 
253 
