(H. ) 



ALBAl^Yj PUBLISHED NOVEMBER 11, 1863. 



PRELIMINARY NOTICE 



Of some Species of Crinoidca from the Waverly Sandstone Series of Summit County, 

 Ohio, supposed to be of tlie age of the Chemung group of New-York. 



In the autumn of 1861, Dr. G. M. Kellogg, of Keokuk, Iowa, 

 placed in my liands for investigation a collection of Crinoidea, 

 among which were several species from the micaceous arenaceous 

 shales near Richfield, Ohio. These species possess a peculiar 

 interest, as coming from a group of strata which have of late be- 

 come debatable ground ; and since no one has shown a physical 

 sequence of the strata by which these beds may be placed in the 

 Carboniferous system, every thing in the palaeontology of the 

 period becomes of great interest ; and it w^as with the hope of 

 obtaining some light upon this question, that I proposed to make 

 this investigation. 



At a later period, 1862, Mr. C. A. White examined the same 

 locality, and made further collections, which, added to those al- 

 ready in my hands, enhanced the interest of the whole. Other 

 engagements, however, have postponed the completion of the in- 

 vestigation till the present time. 



The I'esult of this examination gives the following genera, with 

 the number of species in each : 



AcTiNOCRiNus, three species ; 



Platycrinus, two species ; 



FoRBESiocRiNus, three species ; 



PoTERiocRiNUS proper, two species ; 



PoTERiocRiNUS, Subgenus Scaphiocrinus, four species ( one of these 

 near Zeacrinus) ; 



POTERIOCRINUS, Subgenus ? Zeacrinus, two species : 



Being in all sixteen determined species, besides several undetermined ones. 



The most abundant forms are of the Actinocrinus, of which 

 all the species are very numerous in individuals. After this, one 

 species of Forbesiocrinus is quite abundant. 



