1897.] NEW YORK ACADEMY OF SCIENCES. 251 



mollusca. 

 Pelecypoda. 



Anthracomya PhilHpsi, "Will. 

 " Isevis var. scotica. 



PISCES. 



See preceding list. 



THE BATESYILLE SIXDSTOXE OF ARKANSAS. 



By Stuart Weller. 



contents. 

 Part I. 



I n t loducti on 251 



Historical Sketch of the Batesville Sandstone 253 



Part II. Description of Species 254 



Part III. Correlation 272 



PaUeon tolottic Correlation 272 



Fossil Evidence of the Age of the Batesville Sandstone 272 



Tabulation of the Facts 276 



Summation of the Evidence 277 



Relation Between the Faunas of the Batesville Sandstone and the 



Alaxville Limestone 277 



Stratigraphic Correlation 278 



Stratigraphy of the Mississippian Series in the Batesville Region 278 



Stratigraphy of the Typical Mississippian Section 280 



Comparison of the Two Sections 281 



Conclusion 282 



Plates XIX., XX. and XXI. at end of volume. 



Part I, 



Introduction. 



The present study of the Batesville sandstone and its fauna is 

 based primarily upon a collection of fossils secured during the 

 past summer by the author while collecting for the Walker 

 Museum of the University of Chicago. The types of all the 

 newly described species are in the paleontologic collection of 

 the museum. 



The study of the Batesville sandstone fauna was begun some 

 years since in the laboratory of Prof. H. S. Williams, at Yale 

 University, and it is the author's desire to here express his sin- 

 cere appreciation of the constant aid and encouragement received 

 from Professor Williams during the progress of the investigation. 



Although the more recently secured collection is much the 

 superior, a few of the species are represented by more perfectly 



