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PLATYCRINIDZ. 647 
PLATYCRINUS Miter. 
1821. Platyerinites — MituER; A History of the Crinoidea, p. 74. 
1833. (in part) — Goxpruss; Petrefact. Germ., Vol. L., p. 188. 
1835. <s (in part) — Agassiz; Mem. Soc. Neuchat., Vol. I., p. 197. 
1836. Platycrinus — PHILLIPS ; Geology of Yorkshire, Vol. IL., p. 204. 
1839. Platycrinites (in part) —Gotpruss; Nov. Acta Ac. Leop., Vol. XIX., p. 343. 
1841. Platycrinus (in part) —Jou. Mtuner; Monatsber. Berl. Akad., p. 207.- 
1842. % — TJ, Austin; Ann. and Mag, Nat. Hist., Vol. X., p. 109. 
1843. Es —T. Austin; Monogr. Rec. and Foss. Crinoids, p. 6. 
1844, ¥ — McCoy; Syn. Carb. Limest. Foss. Ireland (ed. 2), p. 175. 
1852. — D’OrBieny; Cours élément. de Paléont., Vol. IL, p. 142. 
1853. eS — DeKon. and Lr Hon; Recherch. Crin. Belg., p. 155. 
1855. S (in part) —F. Roemer; Lethea Geogn. (Ausg. 3), p. 242. 
1857. ss — Pictet; Traité de Paléont., Vol. 1V., p. 330. 
1858. * — Hatt; Geol. Rep. Iowa, Vol. I., Part IL., p. 525. 
1862. a — Dusarpin and Hurt; Hist. natur. des Zooph. Hchin., p. 151. 
1879. — ZittEL; Handb. d. Paleont., Vol. L., p. 364. 
1881. if —W. and Sp.; Revision Paleocr., Part II., p. 65 (Proceed. Acad. Nat. Sci. Phila., p. 
239), and 1890, Proceed. Phila. Acad., pp. 351-3538. 
1885. > —QuernstEept, Handb. der Petrefactenkunde (Ausg. 3), p. 951. 
1889. s —S. A. Mitter; N. A. Geol. and Paleont., p. 270. 
Not Purtiips, 1841; Palewoz. Foss. Cornwall, p. 28 = Herucrinus. 
Not F. Rozmer, 1844; Rhein. Uebergangsg., p. 68 = Coccocrinus. 
tee)e2) 
Not D’Orzieny, 1850; Prodréme de Paléont., I., p. 103 = Marsupiocrinus. 
Not Hatt, 1861; Paleont. N. York, Vol. IIL, pp. 118-117 = Cordylocrinus and Marsupiocrinus. 
Not Scuvzze, 1866; Hchinod. Eifl. Kalk., p. 68 = Storthingocrinus. 
Not Lyon, 1869; Amer. Philos. Soc., Vol. XITI., p. 459 = Hewvacrinus. 
Syn. Astropodia URE, 1893, Hist. of Rutherglen. 
Syn. Nave Encrinite Parxinson, 1811; Org. Rem., Vol. II. 
Syn. Hucrinites Gn part) Scutoruem, 1823; Nachtr. zur Petrefactenkunde. 
Syn. Centrocrinus and Pleurocrinus Austin, 1843; Monogr. Crinoids, p. 6. 
Syn. Ldwardsocrinus 1’OrBiGNY, 1850, Prodréme, Vol. I., p. 156. 
Calyx oblong, globose or pyramidal; the dorsal cup conical, bowl-shaped, 
or discoid. Basals three, large ; two of them equal and twice as large as the 
third; the latter rhomboidal and placed with its upper angle between the 
anterior and the left antero-lateral radials; the plates so closely anchylosed 
that they cannot be separated, often not leaving even a trace of the suture 
line. Radials very large; their upper faces partly excavated, and forming 
a well defined facet for the reception of the brachials; the limbs to both 
sides of the facets more or less sloping, forming notches which support the 
interradial plates. Costals one, exceptionally two,* united with the radials 
by an almost rigid suture, the plate being often so small as to be buried 
within the facets, so that the distichals touch the radials by their outer 
* P. truncatulus from the Lower Burlington limestone, and P. eriensis from the Hamilton group, have 
two well defined costals in every ray. 
