OF ARTS AND SCIENCES. 283 



List of PalcEozoic Echinodermata of North America. 



ACROCRINUS, Yandell, Sill. Jour., 1855, Vol. 20, p. 135. 



A. Shumardi, Yandell, Sill. Jour., 1855, Vol. 20, p. 135, with wood- 

 cut. Suhcarboniferoiis. Archimedes limestone. 



A. URN^FORMis, Hall, Iowa, Vol. 1, p. 690, PL 25, fig. 9, a, b. 

 Suhcarhoniferous. Kaskaskia limestone. 



ACTINOCRINUS, Miller, 1821. 



A. ABNORMis, Lyon, Geol. Survey of Kentucky, Vol. 3, p. 479, PI. 

 4, fig. 1, a, b. Devonian. Beargrass Creek, Kentucky. 



A. iEQUALis, Hall, Iowa, Vol. 1, p. 592, PI. 11, fig. 4, a, b. Sub- 

 carboniferous. Bui'lington limestone. • 



A. BiTURBiNATUs, Hall, lowa, Vol. 1, p. 616, PI. 16, fig. 5, 6, a, b, c. 

 Subcarboniferous. Keokuk limestone. 



A. BREVicoRNis, Hall, Iowa, Vol. 1, p. 571, PI. 10, fig. 4, a, b. 

 Subcarboniferous. Burlington limestone. 



A. BREVis, Hall, Iowa, Vol. 1, p. 567, PI. 10, fig. 3, a, b. Subcar- 

 boniferous. Burlington limestone. 



A. c^LATUS, Hall, Iowa, Vol. 1, p. 585, PI. 10, fig. 14, a, b. Sub- 

 carboniferous. Burlington limestone. 



A. Chrystti, Shumard, Geol. Survey of Missouri, Part 2, p. 191, 

 PL A, fig. 3. Subcarboniferous. Actinocrinites, Chrysty, 

 Letters on Geology, PL 1, fig. 1, 2. Encrinital limestone. 



A. CONCINNUS, Shumard, GeoL Survey of Missouri, Part 2, p. 189, 

 PL A, fig. 5. Subcarboniferous. Encrinital limestone. 



A. CORNICULUS, Hall, Iowa, Vol. 1, p. 566, PL 10, fig. 1, a-c. 

 Subcarboniferous. Burlington limestone. 



A. CORNIGERUS, Hall, Iowa, Vol. 1, p. 576, PL 9, fig. 12, a-c. 

 Subcarboniferous. Burlington limestone. 



A. DiscoiDEUS, Hall, Iowa, VoL 1, p. 594, non Jcon. Subcarbon- 

 iferous. Burlington limestone. 



A. (Bato) eikosiadacttlus, Casseday, Zeitschrift der Deutschen 

 GeoL Gesell. Berlin, 1854, p. 238, PL 2, fig. 1, a-c, 3. 

 Subcarboniferous. Spurgen Hill, Iowa, in the Archimedes 

 limestone. 



A. GouLDi, Hall, Iowa, Vol. 1, p. 613, PL 15, fig. 6, a, b. Subcar- 

 boniferous. Keokuk limestone. 



