1897.] KEW YORK ACADEMY OF SCIENCES. 273 



at the typical localities, and is likewise the most abundant 

 species collected from the Batesville Sandstone. 



4. Ehynchonella mutata. 



This species is of a type abundant in the Devonian and lower 

 Carboniferous rocks. The evidence afforded by its occurrence 

 in the Batesville Sandstone points toward the St. Louis age of 

 the formation. 



5. Spirifer keokuk. 



This species, as it is known from other localities, ranges 

 through the Osage group to the Coal Measures. The Batesville 

 specimens most resemlsle the species as it occurs in the St. 

 Louis group. 



6. Spiriferina sp. 



Species of this genus, similar to the one here recorded, range 

 from the Burlington Limestone to the Coal Measures. Its 

 presence in the Batesville Sandstone fauna affords no definite 

 evidence as to its age. 



7. Athyris subquadrata. 



This species is typically a Kaskaskia form. The Batesville 

 specimens do not differ essentially from those in the Kaskaskia 

 group at its various localities. 



8. Eumetria verneuilana. 



The species of this genus range from the Osage group through 

 the Mississippian series, the later forms becoming more coarsely 

 plicate. The Batesville Sandstone specimens are indistinguish- 

 able from the typical E. verneuilana as it occurs in the St. 

 Louis group. 



9. Dielasma turgida var. elongata. 

 The typical D. turgida is a St. Louis group species. 



10. Pinna arkansana. 



This species is most closely related to P. maxvillensis from 

 the Maxville Limestone of Ohio. The exact age of this forma- 

 tion has never been accurately determined, but it has been re- 

 ferred to the St. Louis-Kaskaskia horizon. P. missouriensis, 

 described from the Kaskaskia group, is apparently an allied 

 species, and the evidence of P. arkansana is towards the Kas- 

 kaskia age of the formation rather than the St. Louis. 



Transactions N. Y. Acad. Sci., Vol. XVI., Sig. 18, June 19, 1897. 



