* 



NEW REPTILES AND STEGOCEPIIALIANS FROM THE UPPER TRIASSIC 



OF WESTERN TEXAS. 



BY E. C. CASE. 



ERRATA. 



-i 2^SS ^ ^^ 



Page 46, line 5, in place of 18(< read figure ISA 

 ^^'^fddleofpa^inpl, ....... f 25A 



' "d I ", 



f 25A read 25B. 

 anterior ,l,,sa,s. read anterior 



yielded a consiireraun m^ 



which is new. The present paper contains descriptions of this nc\v aim 

 fauna. 



The author takes this opportunity to thank the Carnegie Institution of Wash- 

 ington and its officers for the continued support which has made the work possible. 

 Also, he wishes to acknowledge his obligation to Mr. Clifford Jones, manager of 

 the Spur Farm Lands Company, and the other officers of the Swenson properties, 

 for permission to go upon the lands under their control and for many acts of kind- 

 ness and courtesy which rendered the task of collection much easier and con- 

 tributed largely to the success of the work. 



THE UPPER TRIASSIC BEDS OF THE BORDERS OF THE 



STAKED PLAINS. 



The Upper Triassic beds exposed on the borders of the Staked Plains in 

 Texas and New Mexico present the same puzzling complex of terrestrial and 

 fresh-water deposits that they do wherever they appear in the other Plains and 

 Rocky Mountain States. No definite determination of continuous horizons is 

 possible, as the sequence alters rapidly within a short distance and there are many 



7 



