296 PROCEEDINGS OF THE AMERICAN ACADEMY 



PALASTERINA, McCoy, 1851, British Foss., p. 59. 



P. STELLATA, BilHngs, Geol. Survey of Canada, Palteont., Dec. 

 III. p. 76, PI. 9, fig. 1, a, 15. Geol. Rep. 1856, p. 290. 

 Silurian. Trenton limestone. 

 P. RUGOSA, Billings, 1. c. p. 77, PI. 9, fig. 2, a - e. Geol. Rep. 1856, 

 p. 291. Silurian. Hudson River group. 



PENTREMITES, Say, 1820. Pentatremitites, Bronn, Index, 

 and European authors genei'ally. 



P. BiPTRAMiDALis, Hall, lowa, Vol. 1, p. 607, PI. 15, fig. 2. 

 Suhcarboniferous. Keokuk limestone. 



P. CERViNus, Hall, Iowa, Vol. 1, p. 690, PI. 25, fig. 11, a, b. Suh- 

 carhoniferous. Kaskaskia limestone. 



P. Cherokeus, Hall, Iowa, Vol. 1, p. 691, PI. 25, fig. 12, a, b; 

 P. Cherokeus, Troost, MSS. and Cat. P. sulcatus, Rcemer, 

 Monograph. Suhcarhoniferous. Kaskaskia limestone. 



P. CONOID eus. Hall, Trans. Albany Inst., Vol. 4 ; Hall, Iowa, Vol. 

 1, p. 655, PI. 22, fig. 8, 9, 10. Suhcarhoniferous. Warsaw 

 limestone. 



P. CURTUS, Shumard, 1855, Geol. Survey of Missouri, Part 2, p. 

 187, PI. B, fig. 3, a, b. Suhcarhoniferous. Archimedes 

 limestone. 



P. DECUSSATUS, Shumard, Trans. Acad. St. Louis, 1858, Vol. 1, 

 No. 2, p. 242, PI. 9, fig. 6, a, b. Suhcarhoniferous. Button- 

 Mould Knob. 



P. ELONGATUS, Shumard, 1855, Geol. Survey of Missouri, 2d Rep. 

 Part 2, p. 187, PI. B, fig. 4. Suhcarhoniferous. Encrinital 

 limestone. 



P. FLOREALis, Say, Journ. Acad. Nat. Sci. Philad., Vol. 4, No. 9 ; 

 Sowerby, Zool. Journ., Vol. 2, p. 311, PI. 2, fig. 2. ■Suhcar- 

 honiferous. See P. Godoni. 



P. GLOBOSUS, Troost, MSS.; Hall, Iowa, Vol. 1, p. 695, PI. 25, fig. 

 17. Suhcarhoniferous. Kaskaskia limestone. 



P. Godoni. Kentuchj Asterial fossil, Parkinson, 1808, Org. Rem., 

 Vol. 2, p. 235, PL 13, fig. 36, 37. Encrina Godoni, De 

 France, 1818, Diet. Sci. Nat., Tom. 14. Encrinites fiorealis, 

 Schlotheim, 1820, Pet. Got. Pentremites fiorealis. Say, 1822, 

 Sow. Zool. Journ., Vol. 2, p. 311, PI. 11, fig. 2; Troost, 

 Tr. Geol. Soc. Pennsylvania, Vol. 1, p. 224, PI. 10, fig. 8. 



