South Dakota School of Mines 



Bulletin Xo. 13. Plate No. 47. 



A. Daemonelix or "Devils corkscrews" in the Daemonelix beds near 

 Harrison, Sioux county, Nebraska. Photograph by Barbour. 



B. Anterior portion of head of the Oligocene crocodile, Crocodilus pre- 

 nasaJis found in Indian draw, 1899. 



