1881.] NATURAL SCIENCES OF PHILADELPHIA. 245 



1861. PI. canaliculatus Ilall.f Geo). Rep. Iowa, i, pt. ii, p. 539. Upper Burling- 



ton limestone. Burlington, Iowa. 

 1858. PI cavttS Hall. (Pleurocrinus) Geol. Rep., Iowa, i, pt. ii, p. 527, PI. 8, figp. 1 



a, b. Upper Burlington limestone. Burlington, Iowa. 

 1836. PI. contractus Phillips (Gilbertson). Geol. Yorkshire, p. 204, PI. 3, fig. 25. 



McCoy, 1844, Carb. Foss. Ireland, p. 175; D'Orbigny, 1849, Prodr., i, p. 



156. Mountain limestone. Ireland and England. 

 1863. PL contritus Hall. 17th Rep. N. Y. St. Cab., p. 54; also Geol. Rep. Ohio, 



Pal. ii, p. 166, PI. 11, fig. 4. Waverly Gr. Richfield, Ohio. 

 1850. PI. corragatas Ow. and Sh. (Pleurocrinus). Jour. Acad. Nat. Sci. Phila. 



(new ser.), ii, pt. i ; also 1852, U. S. Geol. Surv. Iowa, Wis. and Minn., p. 589, 



PI. 5 a, figs. 2 a-e. Lower Burlington limestone. Burlington, Iowa. 

 Syn. PI. striobraohiatus Hall. 1861, Desc. New Sp. Crin., p. 4; also Bost. 



Jour. Nat. Hist., p. 287, separate photogr. plate 2, figs. 2, 3. 



1849. PI. diadema McCoy. Ann. and Mag. Nat. Hist. (ser. 2), iii, p. 246. Mount 



limest. North Ireland. 



1850. PI. discoidens Ow. and Sh. (Pleurocrinus) Jour. Acad. Nat Sci. Phila. 



(new ser.), vol. ii, pt. i; also 1852, U. S. Geol. Surv. Iowa, Wise, and Minn., 

 p. 688, PI. 5 a, figs. 1 a, b (not PI. disroideus Hall, Geol. Rep. Iowa, i, pt. 

 ii, PI. 8, figs. 8 a, b = Eucladocr. pleurovimenus White). Lower Burling- 

 ton limest. Burlington, Iowa. 



Syn. PI. multibrachiatus Meek and Worthen. 1861, Proc. Acad. Nat. Sci. 

 Phila., p. 134. 



Syn. PI. excavatns Hall. 1861, Desc. New Sp. Crin., p. 7; also Bost. Jour. 

 Nat. Hist., p. 286. 



1862. PI. eboraceus Hall. 15th Rep. N. Y. St. Cab., p. 119, separate photog. PI. 1, 



figs. 16, 17 ; Bigsby, 1878, Hezaor. eboraceus. Thesaurus Devon., p. 18. 



Hamilton Gr. Livingstone Co., N. York. 

 1861. PI. elegans Hall.f Desc. New Sp. Crin., p. 4; also Bost. Jour. Nat. Hist., p. 



285. Upper Burlington limest. Burlington, Iowa. 

 1836. PI. ellipticus Phillips. Geol. Yorkshire, p. 204, PI. 3, fig. 19 (not fig. 21). 



D'Orbigny, 1849, Prodr. i, p. 156. Mount, limest. Bolland, England. 

 Probably synonym of PI. granulatus Miller. 



1861. PI. eminulus Hall. Desc. New Sp. Crin., p. 17. Lower Burlington limest. 



Burlington, Iowa. 



1862. PI. eriensis Hall. 15th Rep. N. Y. St. Cab., p. 119. Hamilton Gr. Erie Co., 



New York. 

 This is the only species in which three radials have been observed, the upper 

 evidently forming a syzygi'im. It may possibly belong to Cordylocrinus. 

 1844. PI. expansus McCoy. Carb. Foss. Ireland, p. 175, PI. 25, figs. 18, 19; 

 D'Orbigny, 1849, Prodr, i, p. 156; Roemer, 1855, Lethata Geogn. (Ausg. 3), 

 1st Periode, p. 245, PI. 4^, figs. 14 a, b. Mount, limest. Ireland. 



1860. PL Georgii Hall. Sup. Geol. Rep. Iowa, p. 82, PI. 1, fig. 7. Warsaw limest. 



Warsaw, 111. 

 1836. PL gigas Gilbertson (Phillips). Geol. of Yorkshire, p. 204, PI. 3, figs. 22, 23; 

 Austin, 1842, Ann. and Mag. Nat. Hist., x, p. 108; also 1843, Mon. Rce. 

 and Foss. Crin., p. 39, PI. 4, figs. 1 a-c. Mount, limej-t. Bollard, England. 



1861. PL glyptus Hall (Pleurocrinus). Desc. New Sps. Crin., p. 16. Upper Bur- 



lington limest. Burlington, Iowa. 

 A mere variety of PL sculptus Hall. 



