NOTES ON THE OHIO SHALES AND THEIR FAUNAS 25 



The bed is two or three feet thick and the fossils have been 

 found in only one locality, about one mile west of Huron, Ohio, 

 No other fossils have been found at this horizon. 



About fifty feet from the bottom of the shales there is a 

 bed that has yielded fish remains from one locality. They con- 

 sist of many Rhadinichthys scales and teeth, several small plates, 

 probably belonging to Rhadinichthys or Stenosteus, and two 

 mandibles of a species named here Stenosteus pertenuis. 



Fifty or sixty feet from the bottom, along the shore of 

 Lake Erie, about two miles west of Huron, Ohio, Mr. H. E. 

 Wilson found remains that probably belong to a new species of 

 Rhadinichthys. The parts found consist of a large number of 

 articulated scales, two mandibles, two maxillae, one fin and a 

 number of head plates. From the published descriptions of 

 species of this genus it is impossible to determine whether or 

 not this form belongs with described species. 



From the bottom of the shales to at least one hundred feet 

 from the bottom there are large concretions, in some places in 

 great abundance, and the nucleus of perhaps one in every 

 hundred of these is adinichthyid bone. The first time that the 

 writer worked along the Huron River he found four or five 

 fossiliferous concretions in five hours. About the same results 

 have been obtained by working along the river once a year. 

 Seven or eight species have been found but the remains are too 

 incomplete to justify descriptions of new species. Dinichthys 

 hertzeri and Dinichthys intermedius are the only described 

 species that have been recognized. 



The next horizon from which the writer has collected is 

 about 150 feet below the contact of the Ohio shales and the 

 Bedford shale. The remains are dinichthyid plates that have 

 not been specifically determined. Above this, fish remains may 

 be expected at any horizon. Near the top occurs a species of 

 Rhadinichthys distinct from those lower. It is represented in the 

 Oberlin collections by scales only. 



Seventy-five feet from the Ohio-Bedford contact a thin 

 layer of green shale has yielded two specimens of an undescribed 



