402 DRAKE — THE GEOLOGY OF INDIAN TERRITORY. [Sept. 3, 



huska-Gray Horse road. These sandstone beds are probably one 

 Hundred and fifty feet above the Pawhuska limestone. 



1. Pinna pei-acuta Shumard. 



2. Schizodus wheelej'i Swallow. 



3. Schizodus 7'ossicits Verneuil. 



4. Nucula bellisiriata Stevens. 



5. Aviculopecten sp. ? 



6. Pleurophorus angidatus Meek and Worthen. 



7. Pleurophorus sp. ? 



8. Myalina swallovi McChesney. 



9. Yoldia subscitula Meek and Hayden. 



10. Pleuroiojnaria perhumerosa Meek. 



1 1 . Belle roplion sp. ? 



Descriptions of Species. 



Producius {Marginifera) adairensis sp. nov. Drake. PI. IX, 

 Figs. 1-3. 

 Shell small, the largest specimen found being three-quarters of an 

 inch in height, and seventeen-twentieths of an inch in greatest 

 breadth, at hinge line. Beak highly arched, and projecting one- 

 third of the entire height of the shell above the hinge line. Ears 

 slightly extended. Surface ornamented with very fine ribs, and 

 occasional small spines, and in the region of the beak, with a slight 

 reticulation. The ventral valve has a distinct medial sinus, which 

 begins near the beak. The outside of the shell resembles some- 

 what Producius inultistriatus Meek, of the Upper Carboniferous, 

 but has the ribs even finer, and the beak somewhat more slender 

 than that species. The inside of the shell shows the characters 



Plate IX. 



PAGE. 



Figs, i, 2 and 3. — Proauctus adairensis nov. sp. Drake. Fig. 2, from 

 Boone limestone, seven miles east of Adair. Figs, i and 3, from 

 Boston group, five miles southeast of Adair 403 



Figs. 4 and 5. — Prodttctus cherokeeensis nov. sp. Drake. Boston group, 



five miles southeast of Adair 403 



Fig. 6. — Avicitlopecten rectilaterarius Cox. Upper Coal Measures, Poteau 



group, four miles northwest of Poteau 403 



Fig. 7. — Schizodus insignis nov. sp. Drake. Permian, five miles east of 



McDermitt 403 



Figs. 8, 9 and 10. — Productus pertemiis Meek. Low^er Carboniferous, St. 



Louis-Chester, five miles southeast of Adair , 403 



