OF ARTS AND SCIENCES. " 293 



GRAPHIOCRINUS, De Koninck and Lehon, 1854. 



G. 14-BRACHiALis, Lyoii, Geol. Survey of Kentucky, Vol. Ill, p. 

 477, PI. 1, fig. 1, 2 a, b. Suhcarhoniferous. Near base of 

 Millstone Grit, Crittenden Co., Kentucky. 



HEMICYSTITES, Hall, 1852. 



H. PARASITICA, Hall, Paloeont. N. York, Vol. 2, p. 246, PI. 51, 

 fig. 18, 19, 20, 20'. Silurian. Niagara group. 



HETEROCYSTITES, Hall, 1852. 



H. ARMATus, Hall, PalfBont. N. York, Vol. 2, p. 229, PI. 49, A, 

 fig. 3, a - c. Silurian. Niagara group. 



HETEROCRINUS, Hall, 1847. 



H. (?) GRACILIS, Hall, Palceont. N. York, Vol. 1, p. 280, PI. 76, 



fig. 3, a, b. Silurian. Hudson River group. 

 H. HETERODACTTLUS, Hall, Palseont. N. York, Vol. 1, p. 279, PL 



76, fig. 1, a-o. Silurian. Hudson River group. 

 H. SIMPLEX, Hall, PaliBont. N. York, Vol. 1, p. 280, PI. 76, fig. 2, 



a — d. Silurian. Hudson River grovip. 



HOMOCRINUS, Hall, 1852. 



H. CYLiNDRicus, Hall, PalfEont. N. York, Vol. 2, p. 186, PI. 41, 



fig. 2, a - c, 3, a - c. Silurian. Niagara group. 

 H. PARVUS, Hall, PalfEont. New York, Vol. 2, p. 185, PL 41, fig. 



1, a-f. Silurian. Niagara group. 

 H. POLYDACTTLUS, Shumard, Trans. Acad. St. Louis, VoL 1, No. 



1, p. 78, PL 1, fig. 6, a, b. Cyathocrinites, Chrysty's Letters, 



PL 1, fig. 7, PL 3, fig. 1. Silurian. Hudson River group, 



Richmond, Indiana. 



ICHTHYOCRINUS, Conrad, Journ. Acad. Nat. Sci. Philad., Vol. 8, 

 p. 279. 



I. BuRLiNGTONENSis, Hall, lowa, Vol. 2, p. 557, with diagram. 

 Suhcarhoniferous. Burlington limestone. 



I. (?) Clintonensis, Hall, Palteont. New York, VoL 2, p. 181, PL 

 A, 41, fig. 5. Silurian. This species is predicated upon 

 • fragments of the arms alone. 



I. LJEVis, Conrad, Journ. Acad. Nat. Sci. Philad., VoL 8, p. 279, PL 

 15, fig. 16. I. Icevis, Hall, Palajont. N. Y^ork, VoL 2, p. 196, 

 PL 43, fig. 2, a- h. Silurian. Niagara group. 



I. TiAR^FORMis, Hall, lowa. Vol. 1, p. 558, with diagram. Suh- 

 carhoniferous. White's Creek, Tennessee. 



