CONTENTS. 



PAGE 



Description of the vertebrate-bearing beds of North-central New Mexico. S. W. Williston and E. C. 



Case I 



Description of Aspidosaurus novomexicanus Williston. E. C. Case and S. W. Williston 7 



Description of Chenoprosopus milleri gen. et sp. nov. M. G. Mehl 11 



Description of a nearly complete skeleton of Diasparactus zenos Case. E. C. Case and S. W. Williston 17 



Description of a nearly complete skeleton of Ophiacodon Marsh. S. W. Williston and E. C. Case. ... 37 



Description of Scoliomus puercensis, new genus and species. S. W. WiUiston and E. C. Case 60 



Description of certain collections of bones referred to Sphenacodon Marsh. E. C. Case and S. W. 



Williston 61 



Description of Edaphosaurus Cope. S. W. Williston and E. C. Case 71 



Edaphosaurus novomexicanus, sp. nov. S. W. Williston and E. C. Case 74 



iv 



