Subclass Theria 100 Order Edentata 100 Order Carnivora 102 Order Pantodonta 102 Order Dinocerata 102 Order Proboscidea 102 Order Perissodactyla 104 Horses 104 Titanotheres 104 Chalicotheres 106 Rhinoceroses 106 Order Artiodactyla 106 Entelodonts 106 Camels 106 Books about fossils 108 General works 108 Nontechnical and juvenile 108 Collecting helps 108 Reference works 109 Selected references on Texas fossils 109 Glossary 111 Index 115 Illustrations