Prefatory Note 



On account of the activity in the oil developments in Kansas and Okla- 

 homa, a more complete knowledge of the fauna of the rocks concerned is 

 necessary for the proper identification of the stratigraphic position of the 

 surface rocks, and the proper interpretation of drill records. The fossils 

 here described are from beds constantly encountered in some of the oil 

 fields, and it is hoped that they may be of assistance to geologists working 

 in that region. 



This study is pubKshed March 1, 1916. 



J. W. B. 



