DESCRIPTION OF NEW SPECIES OF CRINOIDEA AND OTHER FOSSILS 



STRATA OF THE AGK OF THE HUDSON-RIVER GROUP AND 

 TRENTON LIMESTONE.* 



By JAMES HALL. 



Several years since, I received from Mr. J. Kelly O'Neal 1, of 

 Lebanon, Ohio, a new and interesting species of Glyptocrinus from 

 the shales of the age of the Hudson-river group at that place, with a 

 request that I would describe it. Subsequently he sent to me, 

 together with other fossils, a species of Heterocrinus and an interest- 

 ing form of PoTERiocRiNus, from the same formation. I have also 

 had in my possession for some years other undescribed species from 

 the neighborhood of Cincinnati ; one of them a peculiar form of 

 Heterocrinus (^. ^c»Z2/a?6>), of which I have received a specimen from 

 Prof. W. H. Thomas, one from Mr. S. T. Carley, and have been per- 

 mitted to examine a very interesting one in the collection of Mr. 

 U. P. James. 



I have likewise received a few interesting specimens of other forms 

 from Mr. C. B. Dyer, of Cincinnati, and 1 am indebted to the libe- 

 rality of Mr. David Christy, formerly of Oxford, Ohio, for undescribed 

 species. To these have been added some others which have remained 

 for a long time undescribed among my collections. I have also 

 noticed in their proper relation several congeneric forms which have 

 been previously described from the same formations. 



This paper was originally prepared for the twentieth report on tlie 

 State Cabinet. Advance sheets of it were printed and distributed in 

 !Noveml)er, 1866, but it not being possible to complete the plates to 

 illustrate it in season for the printing of the report, its republication 

 has been delayed until the present time. 



In October, 1871, additional copies of the paper were distributed 

 in connection with the paper following it in this report, entitled 

 " New Species of Fossils from the Hudson-river Group in the Vicinity 

 of Cincinnati, Ohio," — the two constituting a single pamphlet. 



*Thi8 paper was originally published in November, 1866, as advance sheets of the Twentieth 

 Report on the New York State Cabinet of Natural History, In the present publication, there have 

 been added descriptions of Glyptocrinus parvtcs^ Poteriocrirms posticus, Heterocrinus consirictus, H. 

 laxus and Proetus parviuseulus : of these, figures with their explanations were given in a reissue of 

 the paper in October, 1871. There have also been added diagrams (1-3) illustrative of the genera 

 Gltptocbintjs and Glyptasteb. 



