OOZ TRANS. OF THE ACAD. OF SCIENCE. 



AGARICOCRINUS, Troost (continued). 



Whitfieldi, Hall, 1858. Geol. Iowa, vol. i.. p. 621. — Arch.— 

 Green Co., Illinois. 



Wortheni, Hall, 1858. Geol. Iowa, vol. i., p. G19, pi. 16, fig. 1.— 

 Arch. — Warsaw, Illinois. 



AGASSIZOCRINUS, Troost, 1850. List of Crinoidea of Tenessee, 

 p. 60.— Owen & Shumard, 1851. Jour. Ac. Kit. Sci. Phil., 

 n. ser., vol. ii.— Shumard, 1853. Marcy's Rep. Red River 

 of Louisiana. t — Astylocrims, Roomer, 1854. Leth. Geog., 

 p. 229. — Agassizocrinus, Hall, 1858. Geol. Iowa., vol. i., 

 p. 685. 



conicus, Owen & Shumard, 1851. Jour. Acad. Nat. Sci. Phil., n. 



ser., vol. ii., p. 93, pi. xi., fig. G. — Id. Geol. Rep. Iowa, 



Wisconsin and Minnesota, p. 597, pi. v., fig. 6. — Kask. — 



Chester, Illinois, 

 daetyliformis, Troost, 1850. List Crin. Tenn. Camh. Meet,, p. 60. 



Shumard, 1853. Marcy's Rep. Red River of Louisiana, p. 



199. — Astylocrinus hcvis, Roomer, 1854. Lethasa Geognost. 



Kohl. Geb., p. 229, tab. iv., fig. 13. — Agassizocrinus daety- 

 liformis, Hall, 1858. Geol. Iowa, vol. i., p. 685, fig. 113. 



— Kask. — Chester, Illinois; Crittenden County, Kentucky; 



Washington Co., Arkansas ; Tennessee, 

 constrictus, Hall, 1858. Geol. Iowa, vol. i., p. 687, pi. 25. fig. 



10.-*-Kask.— Chester, Illinois, 

 gibbosus, Hall, 1858. Geol. Iowa, vol. i., p. 686, pi. 25, fig. 6. 



(Compare A. [Poteriocrinus] occidentalis, Owen & Shum.) 



— Kask. — Chester, Illinois, 

 gracilis,* Troost, 1850. List Crin. Tenn. in Proc. Amer. Assoc. 



Camb. Meet., p. 62. — Tennessee. 

 (?) occidentalis.J Poteriocrinus occidentalis, Owen & Shumard, 



1852. Jour. Acad. Nat. Sci. Phil., n. ser., vol. ii., p. 92, 



pi. xi., fig. 5. — Id. Geol. Surv. of Iowa, Wis. & Minnes., p. 



596, tab. v. b, fig. 4. (Compare A. gibbosus, Hall.) — Kask. 



— Chester, Illinois. 



t In this Report the present writer gave a short description, with a fig- 

 ure of Agassizocrinus daetyliformis, from a specimen collected by Dr. Geo. 

 G. Shumard in Washington Co., Arkansas, adopting Troost's catalogue 

 name, under which designation the fossil was widely known by collectors 

 in the Western States. The nearly perfect specimen figured by Rcemer 

 (Lethsea G-eognost., Tab. IV., fig. 13) as Astylocrinus Icevis is now in my 

 cabinet, and a plaster cast of it obligingly made forme by S. S. Lyon, Esq., 

 together with some basal plates of the fossil, were furnished to Dr. Rcemer, 

 with Troost's name attached, during his visit to this country. 



J I am now pretty well satisfied that this Crinoid belongs to Agassizo- 

 crinus rather than Poteriocrinus. A. gibbosus of Hall is very nearly rela- 

 ted, if not identical. The published figures of the species in the Jour, of 

 Acad. Nat. Sci. Phil., and in Owen's Report, are faulty in this, that the 

 excavation at the point of attachment for the column is too strongly mark- 

 ed, and in the description a qucere mark should have been placed after 

 " basal plate" in the second sentence, because the existence of a concealed 

 basal plate was merely inferred under the supposition that the fossil was a 

 Poteriocrinus. The original specimen of A. occidentalis is now in the col- 

 lection of the late Dr. I). D. Owen, at New Harmony, Indiana, and until we 

 can have an opportunity of comparing Hall's species with it, the question 

 of identity or non-identity must remain unsettled. 



