FOSSILS OF THE COAL MEASURES. 569 



where it occurs associated with nearly all the fossils in the upper Coal 

 Measures of Kansas and Iowa, and in those in Nebraska referred by 

 Professors MARCOU and GEIMTZ to the Permian. 



Genus PKODUCTUS, Sowerby. 

 PRODUCTUS XEBBASCEXSIS, Owen. 



PL 25, Fig. 8. 



Froduetu* yebra*f*n*is. OWEN. 1852. Geol. Report Wis.. lovra and Minn., p. 584, PL 5, Fig. 3; 1867, 



MM HESXEY. Trans. Acad. Sci., Vol. I, p. -24. PL 1. Fig. 7. 

 Syn. P. Sogertii, NORWOOD and PRATTEX. Jour. Acad. Xat. ScL, Phila., VoL m, new series, p. 9, 



PL L Fig. 3. a. b. c. 

 P. asper, MCCHESXEY, 1860. Desc. new Paleozoic Fossils, p. 34. 



Locality and position Coal Measures, Sangamon and La Salle coun- 

 ties, Illinois. 



PRODUCTUS LONGISPINUS, Sowerby? 



PL 25, Fig. 10. 



Produettt* longispintu,, SOWERBY, 1814. Min. Conch , VoL I, p. 154. PL LXVHL, Fig. 1. 



P. Wabathgnnt, NORWOOD and PRATTEX, 1854. Jour. Acad. Jfat. Sci., Phila^ VoL TTT, new series, 



p. la PL 1. Fig. 6. 

 P. upkndens, of same authors, 1854. Jour. Acad. Xat ScL, Phila., VoL m, new series, p. 11, PL 1, 



Fig. 5. 



Locality and position Abundant throughout the Upper and Lower 



Coal Measures of Illinois. 



PRODUCTUS PUNCTATUS, Martin. 



PL 25, Fig. 13. 



Productu* punetattu, MARTIX, 1809. Petref. Derb. PL XXXV1L Fig. 6. 

 P. tubatofpinu*. McCHESXEY, 1880. Descrip. New PaL Foss., p. 37. 



Locality and position Upper and Lower Coal Measures of Uliiiois. 



PRODUCTUS LASALLENSIS, Worthen Ms. 



PL 25, Fig. 9. 



THIS sbell resembles the one nsually referred to P. cos- 

 tatus, of Sowerby, but differs from that form in having a 

 narrower and deeper sinus, which extends to the beak; ears 



-73 



