OF ARTS AND SCIENCES. 295 



MELONITES, Owen and Norwood, 1846. 



M. MULTiPORA, Owen and Norwood, Sill. Journ., 2d Series, Vol. 



II, p. 225, with figure. Remarks on same, Engelmann in 

 Vol. 3, p. 124. Sicbcarhoniferous. St. Louis Limestone. 

 This fossil has since been restored to Palcechinus multipora. 



MYELODACTYLUS, Hall, 1852. 



M. BRACHiATUs, Hall, Palojont. N. York, Vol. 2, p. 232, PI. 45, 



fig. 7, a — e. Silurian. Fragments of arms. 

 M. CONVOLUTUS, Hall, Palseont. N. York, Vol. 2, p. 192, PL 42, 

 fig. 5 a, b, 6 a - h. Silurian. Niagara group. 



NUCLEOCRINUS, Conrad, 1842. Olivanites, Troost's List in 

 Proceed. Amer. Assoc. 1849. El^acrinus, Roemer, 1852. 



N. ELEGANS, Conrad, Journ. Acad. Nat. Sci. Philad., Vol. 8, Part 2, 

 p. 235. Devonian. Hamilton group. 



N. Halli, Conrad, Geol. 3d Dist. New York, p. 163. Devonian. 

 Hamilton group. 



N. Verneuili, Troost, List and Proceedings. Pentremites Ver- 

 neuili, 6th Rep. Tennessee, 1841. Beadle (D'Orb.), Prodrom, 

 1, p. 102. Elceacrinus Verneuili, Roemer, Monograph, 

 Blastoid. 1852, p. 59, PI. 5, fig. 1, a - e. Olivanites Verneuili, 

 Lyon, Geol. Survey of Kentucky, Vol. 3, p. 490. Devonian. 

 Falls of the Ohio ; Beargrass Creek. 



N. AFGULARis, Lyon, Geol. Survey of Kentucky, Vol. 3, p. 492, 

 PI. 5, fig. 2, a, b. Devonian. Beargrass Creek. 



PAL^ASTER, Hall, 1852. 



P. Niagarensis, Hall, Paljeont. N. York, Vol. 2, p. 247, PI. 51, 

 fig. 21, 22, 23. Siluria7i. Niagara group. 



PAL^OCIDARIS. Vide Archeocidaris. 



PAL^OCYSTITES, Billings, 1858, Geol. Survey of Canada, Palse- 

 ont., Dec. HL p. 68. 

 P. Chapmani, Billings, Geol. Survey of Canada, Palteont., Dec. 



III. p. 71. Silurian. Lower vSilurian rocks of the age of 

 the Trenton and Chazy limestones and Hudson River group. 



P. Daws ONI, Billings, Geol. Survey of Canada, Palaeont., Dec. 

 III. p. 70. Silurian. Chazy limestone. 



P. TENUiRADiATUS, Billings, Geol. Survey of Canada, 1. c. p. 69. 

 Actinocrinus tenuiradiatus. Hall, Palaeont. N. York, Vol. 1, 

 p. 18, PI. 4, fig. 8, 9. Silurian. Chazy limestone. 



