OF ARTS AND SCIENCES. 291 



D. SIMPLEX, Shuraard, 1. c. p. 74, PI. 1, fig. 2, a, b. Hall, Iowa, 

 Vol. 1, p. 654, PI. 22, fig. 12, a, b. Siibcarboniferous. Archi- 

 medes limestone, Warsaw limestone. 



D. STRiATDS, Owen and Shumard, Geol. Survey of Wisconsin, 

 Iowa, and Minnesota, p. 590, PI. 5 A, fig. 10, a, b. Suh- 

 carboniferoiis. Burlington, Iowa. 



DOLATOCRINUS, Lyon, 1857. 



D. LACUS, Lyon, Geol. Survey of Ken., Vol. 3, p. 482, PI. 4, fig. 2, 



a - c. Devonian. Beargrass Creek ; Falls of the Ohio. 



DORYCRINUS. Vide Actinocrinus. 



ECHINOENCRINITES, ll. von Meyer, 1826. 



E. ANATiFORMis, Hall, Pala3ont. New York, Vol. 1, p. 89, PI. 29, 



fig. 4, a- f. Silurian. Trenton limestone. 



ECHINOSPHERITES, Wahlenberg, 182L 



E. ? Hall, in Foster and Whitney's Rep. Superior, Part 11. 



p. 208, PI. 25, fig. 3, a, b. Silurian. 



EDRIOASTER, Billings, 1858. Cyclaster, Geol. Survey of Can- 

 ada, Rep. 1856, p. 292. 

 E. BiGSBYi, Billings, Geol. Survey of Canada, Palteont., Dec. III. 

 p. 82. Cyclaster Bigshyi, Survey Rep. 1856, p. 293. Silu- 

 rian. Trenton limestone. 



ELiECRINUS. F^We Nucleocrinus. 



ELEUTHEROCRINUS, Yandell and Shumard, 1856. 



E. Cassedayi, Y^'andell and Shumard, Proceed. Acad. Nat. Sci. 

 Phil., Vol. 8, p. 74, PI. 2, fig. 1-5. Devonian. Beargrass 

 Creek, near Louisville, Kentucky. 



EUCALY^PTOCRINUS, Goldfuss (Agas.), 1834. 



E. c^LATUS, Hall, Palajont. N. York, Vol. 2, p. 210, PI. 47, fig. 

 4, a-e. Hypanthocrinites ccelatus, Hall, Geol. Rep. 4th 

 District, 1843, p. 113, fig. 1. Silurian. Niagara group. 



E. DECORUS, Hall, Palajont. N. York, Vol. 2, p. 207, PI. 47, fig. 

 l,2a-h, 3a-d. Hypanthocrinites decorus, Phillips, Mur- 

 chison, Sil. Syst., 1839, p. 672, PI. 17, fig. 3. H. decorus, 

 Hall, 1843, Geol. Rep. 4th Dist. N. York, p. 113, fig. 2, 3. 

 Compare H. coelatus ut supra. Silurian. Niagara group. 



E. PAPULOSUS, Hall, Palajont. N. York, Vol. 2, p. 211, PI. 47, 

 fig. 5, a, b. Silurian. Niagara group. 



