434 GEOLOGY OF OHIO. 



Species from below the "Bone-Bed." 



PROTOZOA. 



Stromatopora DeBlainville. 



S. granulosa Nich. 



S. nodulata Nich. 



,S. ponder osa Nich. 



S. Sanduskyensis Rominger. 



S. substriatella Nich. 

 Cannopora Phillips. 



C. columnaris Nich. 1 



C. densa Nich. 1 

 Receptaculites DeFrance. 



R. Devonicus Whitf. 



RADIATA. 



Favosites Lamark. 



F. basalticus Goldf. 



F. Gothlandic Lamarck. (?) 



F. hemispheric Yand. and Shumard. 



F. invaginat Nich. 



F. pleurodictyoides Nich. 



F. polymorph Goldf. ? 



F. twbinat Billings. 

 Michelinia DeKoninck. 



M. convexa Emmons. 



M. maxima Troost. 

 Emmonsia Ed. and Haime. 



E. Emmonsi Hall. 

 Trachypoea Ed. and Haime. 



T. elegantula Billings. 



'Since writing the above remarks, Vol. V. of the Palseont. of New York has 

 been published. In it the author has, on p. 139, some remarks on the limestones at 

 the Falls oi the Ohio, and their relations to the Hamilton group of New York. 

 After showing that the Hydraulic-cement beds of the Falls of the Ohio are the 

 equivalents of the Hamilton group of New York (which had already been stated in 

 the Geol. Rept. Ind., 1875, pp. 147, 148, and also shown in sections on page 157), the 

 author remarks, " In the State of Ohio, similar conditions may be inferred, from the 

 fact that certain known species of Hamilton fossils are published in the Ohio Geo- 

 logical Reports as from the Corniferous group." At the meeting of the Am. Assoc, 

 for the Advancement of Science, at Saiatoga, August, 1879 (see Proc. A A. A. Sci., 

 vol. xxviii, p. 297), I read a notice of the occurrence in Ohio of rocks representing 

 the Marcellus shales of New York, embracing most ot the substance of this note, 

 and in which it was shown that a considerable thickness of the limestones previously 

 recognized as " Corniferous " in Ohio, were above the horizon of the beds which I 

 had recognized, from palseoutological and lithological evidence, as of the age of the 

 Marcellus shale, and would be of necessity equivalents of the Hamilton group. 

 This was in August, 1 879. The volume above-mentioned is dated, in the letter of 

 transmissal, Dec. 15, 1879. 



