DESCRIPTIONS OV THE SPECIES. 157 



stone itself, but in slatish beds which are possibly of Devonian age." We have been 

 unable to examine the specimen, and do not know if it be a true Pentremites or not. 

 If so it is strange tbat only one European species should be known, for Goldfuss's 

 figure appears to represent a true Pentremites, although ou closer examination the 

 specimen might be found to differ from this type. Its geological and its systematic 

 position are therefore alike uncertain. Apart from this doubtful type the earliest 

 known species of Pentremites are the J', elongatus and P. Burlingtonemis of the 

 Upper Burlington Limestone. We know of no species from the Keokuk group ; 

 while the only representatives of the genus in the Warsaw Limestone are P. conoideus 

 and its variety Koninckanus. The Chester Limestone, however, is fairly crammed 

 with several species of Pentremites. 

 Type. Encrina Godoni, Defrance. 



Pentremites Godoni, Defrance, sp. 

 (PL I. tig. 11 ; PL II. figs. 1-13; PI. XII. figs. 1G, 17; PI. XVI. figs. 19, 22, 23.) 



Asterial Fossil, Parkinson, Organic Remains, 1808, vol. ii. p. 235, t. 13. f. 36 & 37. 

 Asteritefrom Kentucky, Mitchell, in Cuvier's Theory of the Earth, N. York edit. 1 818, t. 8. f. G. 

 Encrina Godoni, Defrance, Diet. Sci. Nat. 1819, tome xiv. p. 467. 

 Encrinites Jiorealis, von Schlotheim, Petrefactcnkundc, 1820, Bd. ii. p. 38. 

 Pentremite ( Kentucky Asterial Fossil), Say, American Journ. Sci. 1820, vol. ii. p. 38. 

 Pentremites jiorealis, Say, Journ. Acad. Nat. Sci. Philad. 1825, vol. iv. pt. 2, p. 295; Zool. 



Journ. 1825, vol. ii. no. 7, p. 314. 

 Pentremites jiorealis, G. B. Sowerby, Zool. Journ. 1825, vol. ii. no. 7, t. 11. f. 2 (3 figs.). 

 Mitra rugoso, quinque perforata, Cumberland, Reliquiae Conservatse, 1826, p. 34, t. a (non b), 



f. 1-3. 

 Pentremites jiorealis, Goldfuss, Petrefacta Germanise, 1826, Theil i. p. 161, t. 50. f. 2, a-c. 

 Pentremites Jiorealis, Troost, Trans. Gcol. Soc. Pennsyl. 1835, vol. i. pt. 2, p. 224, t. 10. 



f. 10 & 11. 

 Pent atremat it es Jiorealis, Roemer, Archivf. Naturgesch. 1851, Jahrg. xvii.Bd. i. p. 353, t. 4. 



f. 1-4, t. 5. f. 8. 

 Pent atrematites jiorealis, Roemer, in Bronu's Lethsea Geogn. Drittc Aufl. 1852-54, Theil ii, 



p. 281, t. 4'. f. 8, a-d. 

 Pentremites Jiorealis, 0. & S., Wisconsin, Iowa, and Minnesota Geol. Report, 1852, p. 592. 

 Pentremites Godoni, Hall, Iowa Geol. Report, 1858, vol. ii. pt. 2, p. 692, t. 25. f. 13, a & 6. 

 Pentremites Godoni, Shumard, Trans. St. Louis Acad. Sci. 1858, vol. i. no. 2, p. 245. 

 Pentremites Godoni, et Jiorealis, Lyon &Casseday, Proc. American Acad. 1860, vol. iv. p. 296. 

 Pentatremites Jiorealis, Bronn, Klassen und Ordn. Thier-Reichs, I860, Bd. ii. t. 23. f. 1,a-e. 

 Pentremites Jiorealis, Dujardin & Dupe, Hist. Nat. Zooph. Echinod. 1862, p. 90. 

 Pentremites Godoni, Shumard, Trans. St. Louis Acad. Sei. 1865, vol. ii. no. 2, p. 384. 

 Pentremites Godoni, Billings, American Journ. Sci. 1869, vol. xlviii. p. 81. fig. 13. 

 Pentremites Jiorealis, Quenstedt, Petrefacteuk. Deutschlamls, 1<ST0, Bd. iv. p. 714, Atlas. 



t. 114. figs. 65-67. 

 Pentremites Godoni, White, in Collett's 2nd Ann. Report, Dcpt. Stat, and Geol. Indiana, 



1880, p. 511, t. 7. f. 10 and 11. 



