UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 11, No. 4, pp. 433-435, 2 text-figures May 9, 1919 



A CESTRACIONT SPINE FROM THE 

 MIDDLE TRIASSIC OF NEVADA 



BY 



PIRIE DAVIDSON 



UNIVERSITY OF CALIFORNIA PRESS 

 BERKELEY 



