1881.] NATURAL SCIENCES OF PHILADELPHIA. 23i) 



with small ones ; central perforation obtusely pentagonal, con- 

 siderably- larger than in Platycrinus. 



Geological Position, etc. — Marsupiocrinus is strictly an Upper 

 Silurian genus, and is found both in Europe and America. 



We recognize the following species : — 



1839. Marsupiocrinus coelatus Phillips. Type of the genus. Murehison's Silur. 



Syst., p. 672, PI. 18, fig. 1; Austin, 1842. Ann. and Mag. Nat. Hist., s, 



p. 109. Upper Silurian. Dudley, Eng. 

 1878. Marsupiocr. depressus Angelin. Icon. Crin. Suec, p. 3, PI. 10, figs. 15-17. 



Upper Silurian. Gothland, Sweden. 

 1878. Marsupiocr. pulcher Angelin. Icon. Crin. Suec, p. 3, PI. 22, figs. 27, 28 : 



and PI. 27, figs. 4, 4 a. Upper Silurian. Gothland, Sweden. 

 1878. M. radiatus Ang. Icon. Crin. Suec, p. 2, PI. 10, figs. 18-21. Upper Silurian. 



Gothland, Sweden. This species was erroneously referred by Hisipger to 



Eucalyptocrinus rosaceus Goldf. 

 1878. M. rugulosus Ang. Icon. Crin. Suec, p. 2, PI. 22, fig. 1. Upper Silurian. 



Gothland, Sweden. 

 *1860, M. Tennesseensis F. Roemer. (Platycr. Tennesseensis) Sil. Fauna. West 



Tenn., p. 35, PI. 3, figs. 4, a-e; Shumard, 1866. Cupellaecrinus Tennes- 

 seensis, Cat. Pal. Foss., pt. i, p. 362. Niagara Gr., Upper Silurian. 



Decatur Co., Tenn. 

 *1861. M. tentaculatus Hall. (Platycr. tentaculatus) Pal. New York, iii, p 116, 



PI. 5, figs. 1-4. Lower Ilelderberg Gr., Upper Sil. Schoharie, New York. 



5. PLATYCRINUS Miller. 



1821. Miller. Hist, of the Crinoidea, p. 73. 



1833. Goldfuss, in part. Petrefact. Germ., i. 



1835. Agassiz, in part. Mem. Soc. Neucliat., i, p. 197, 



1836. Phillips. Geol.of Yorkshire, ii, p. 204. 



1839. Goldfuss, in part. Nov. Acta. Ac. Leop., xix, p. 343. 



1841. Joh. Miiller. Monatsb. Berl. Akad., i, p. 207. 



1842. T. Austin. Ann. and Mag. Nat. Hist., x, p. 109. 



1843. T. Austin, Ibid., xi, p. 199. 



1843. T. Austin. Men. Pec. Foss. Crin., p. 6. 



1849. McCoy. Ann. and Mag, Nat. Hist. (ser. 2), iii, p. 146. 



1850. D'Orbigny. Prodr. de Paleont., i, p. 156. 



1852. D'Orbigny. Cours. Elem, de Paleont,, ii, p, 242. 



1852. Quenstedt, in part, Handb. d. Petrefakt., p. 619. 



1853. De Koninck and Lehon. Recherch. Crin. Belg. , p. 155, 

 1855, F. Roemei-. Lethsea Geogn. (Ausg. iii), p. 242, 



1857. Pictet. Traite de Paleont., iv. p. 330. 



1858. Hall. Geol. Rep. Iowa, i, Pt. ii, p. 525. 



1866. Meek and Worthen, Geol. Rep. 111., ii, p. 170. 



1878. Wachsm. and Spr, Proc, Acad, Nat, Sci, Phila., p. 243. 



