OF ARTS AND SCIENCES. 301 



P. HEMisPHJERicus, Sliumard, Trans. Acad. Sci. St. Louis, Vol. 1, 

 No. 2, 1858, p. 221. Coal measures. 



P. LONGiDACTTLUS, Sliumard (non Austin, Crin., PI. 11. Vide 

 P. Missouriensis. Snhcarhoniferous. St. Louis limestone. 



P. Meekianus, Sliumard, Geological Survey of Missouri, Part 2, 

 p. 188, PL A, fig. 7, a, b. Snhcarhoniferous. Encrinital 

 limestone (?). 



P. Missouriensis, Sliumard, Trans. Acad. St. Louis, 1857, Vol. 1, 

 No. 1, p. 80. P. longidactylus, Geol. Survey of Missouri, 

 p. 188, PI. B, fig. 5, a- c. Suhcarhoniferous. Sliumard pro- 

 poses P. 3fissouriensis instead of P. longidactylus (Austin), 

 which he had unwittingly appropriated. 

 * P. occiDENTALis, Owcn and Shumard, Journ. Acad. Nat. Sci. 

 Pliilad., Vol. 2, 2d Series, 1851 ; Geol. Survey of Wisconsin, 

 Iowa, and Minnesota, p. 596, PL 5 B, fig. 5, a, b. Suhcar- 

 honiferous. Kaskaskia limestone. 



P. RHOMBiFERUS, Owen and Shumard, Journ. Acad. Nat. Sci. 

 Philad., 1851 ; Geol. Survey of Wisconsin, Iowa, and Min- 

 nesota, p. 595, PL 5 B, fig. 2, a - c. Suhcarhoniferous. Bui"- 

 lington limestone. 



P. RUGOSUS, Shumard, Trans. Acad. Sci. St. Louis, Vol. 1, No. 2, 

 p. 223. Suhcarhoniferous. Coal measures. 



P. SPINOSUS, Owen and Shumard, Journ. Acad. Nat. Sci. Philad., 

 2d Series, VoL 2, 1851 ; Geol. Survey of Wisconsin, Iowa, 

 and Minnesota, p. 596, PL 5 B, fig. 4. Suhcarhoniferous. 

 Chester, Illinois, in Kaskaskia limestone ; Greyson Co., Ken- 

 tucky. 



P. TUMiDUS, Owen and Shumard, Journ. Acad. Nat. Sci., 2d Series, 

 Vol. 2, 1851 ; Geol. Survey of Wisconsin, Iowa, and Min- 

 nesota, p. 595, PL 5 B, fig. 3, a, b. Suhcarhoniferous. Kas- 

 kaskia limestone. 



PTEROTOCRINUS, Lyon and Casseday, 1859.* 



P. CAPiTALis. Asterocrinus capitalis, Lyon, Geological Survey of 



* The name Asterocrinus was given to a new genus of fossil crinoids described 

 by Lyon. As this name had already been appropriated by Miinster, we deem it 

 necessary to change the generic appellation to Pterotocrinus. We have, in manu- 

 script, descriptions of several new species of this peculiar genus of Crinoidea. 



