INTRODUCTION. 



Although the Upper Cretaceous beds of Kansas have been the 

 object of much attention from paleontologists and collectors, yet 

 until recently but little consideration has been given to their 

 invertebrate faunas. The discoveries of such a large list of ver- 

 tebrate forms as the Kansas Upper Cretaceous has produced 

 have had a tendency to overshadow the importance of its in- 

 vertebrate forms. 



The following review and classification of the invertebrate 

 faunas of three of the Upper Cretaceous divisions of Kansas 

 contain the descriptions and figures of nearly seventy-five 

 forms, embracing seventeen believed to be new to science. It 

 is the direct result of the study of the invertebrate fossils al- 

 ready belonging to the Kansas State University collection, those 

 collected by the writer while working on the stratigraphy of 

 the Upper Cretaceous of Kansas under the direction of the Uni- 

 versity Geological Survey, and those collected by Doctor Wil- 

 liston and the writer during the summer of 1897. In this 

 classification I have attempted to combine, together with the 

 purely scientific, information that may be utilized by the gen- 

 eral reader. This attempt has led to a general rather than a 

 strictly scientific discussion of the subkingdoms of Inverte- 

 brata. In order, however, that its value to the scientist may 

 not be impaired, the customary order of scientific description 

 has been retained for both the already-described and the new 

 species. In all species already described the original descrip- 

 tions and figures, as far as practicable, have been retained. 



In the preparation of this report the writer desires to ac- 

 knowledge his indebtedness to Dr. S. W. Williston for valuable 

 assistance in the laboratory and field ; also to the following, for 

 courtesies extended : Mr. T. W. Stanton, of the United States 

 Geological Survey, Washington, D. C. ; Mr. W. Madden, Hays 

 City, Kans. ; Mr. M. R. Watson, McCracken, Kans. ; Prof. H. 

 J. Harnley, McPherson, Kans. ; and Mr. Stanley Moore, Pleas- 

 anton, Kans. 



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