CONTENTS 



INTRODUCTION i 



Cacops Bone-Bed 4 



Craddock Bone-Bed 5 



Permian of New Mexico 7 



CLASS AMPHIBIA; SUBCLASS STEGOCEPHALA 9 



Order Temnospondyli 9 



Family Eryopidae 9 



Eryops grandis 10 



Aspidosaurus novomexicanus 12 



Aspidosaurus peltatus 13 



CLASS REPTILIA 15 



Order Cotylosauria 15 



Family Diadectidae 16 



Nothodon lentus 16 



Diadectes, species 23 



Family Limnoscelidae 23 



Limnoscelis paludis 23 



Family Seymouriidae 48 



Seymouria baylorensis 48 



Family Pariotichidae 68 



Captorhinus, species 68 



Captorhinus illinoiensis 69 



Order Theromorpha . . . , 70 



Family Sphenacodontidae 72 



Clepsydrops 72 



Clepsydrops natalis 73 



Xaosaurus, species 75 



Sphenacodon ferox 78 



Family Poliosauridae-f 80 



Ophiacodon minis 81 



Yaranosaurus brevirostris 85 



Family Caseidae in 



Casea broilii 112 



Trispondylus texensis 131 



Genus incertae sedis 135 



Platyhystrix rugosus 135 



Species incertae sedis 137 



EXPLANATION OF PLATES 140 



INDEX 145 



PLATES I-XXXYIII 



24177:5 



