PLATYCEINID^. 647 



PLATTCRINUS Milleb. 



1821. FlatycrUiUes — Milleii; A History of tlie Ciiaoidea, p. 74- 



1S33. " (iu part) — Goldfuss; Petrefact. Germ., Vol. I., p. 188. 



1835. " (in part) — A&assiz; Mem. Soc. Neucliat., Vol I., p. 197. 



1836. PtoycraKs — Phillips; Geology of lorlisliire, Vol. II., p. 204. 



1839. Plati/crinites (in part) — Goldfdss; Nov. Acta Ac. Leop., Vol. XIX., p. 343. 



1841. Flatycrinus (iu part) — JoH. JVIuller; iVIonatsber. Berl. Altad., p. 207. 



1842. " —T. Austin; Aun. and Mag, Nat. Hist., Vol. X., p. 109. 



1843. " — T. Austin; Monogr. Rec. and Foss. Crinoids, p. 6. 



1844. " —McCoy; Syn. Garb. Limest. Toss. Ireland (ed. 2), p. 175. 



1852. . " — D'Okbignt ; Cours element, de Paleont., Vol. II., p. 142. 



1853. " — DeKon. and Le Hon; Recberch. Grin. Belg., p. 155. 

 1855. " (in part) — F. Roemer; Letbsea Geogn. (Ausg. 3), p. 242. 

 1857. ■' — PicTET ; Traite de Paleont., Vol. IV., p. 330. 



1858: " — Hall; Geol. Rep. Iowa, Vol. I., Part n., p. 525. 



1862. " — Ddjakdin and Hupe; Hist, natur. des Zoopli. Eohiii., p. 151. 



1879. " — Zittel; Ilaudb. d. Palffiont., Vol. I., p. 364. 



1881. " — W. and Sp. ; Revision Pala:ocr., Part II., p. 65 (Proceed. Acad. Nat. Sci. Pbila., p. 



239), and 1S90, Proceed. Phila. Acad., pp. 351-353. 

 1885. " — Quenstedt, Handb. der Petrefactenkunde (Ausg. 3), p. 951. 



1889. " — S. A. Millek; N. A. Geol. and Pateont., p. 270. 



Not Phillips, 1841 ; Palaioz. Foss. Cornwall, p. 28 =: Hexacrimis. 



Not F. RoEMEK, 1844 ; Rbein. Uebergangsg., p. 63 = Coccocrinus. 



Not D'Orbignt, 1850; Prodrome de Paleont., I., p. lOS ^ 3fBrs?ipioertiifis. 



Not Hall, 1861 ; Palteont. N. York, Vol. III., pp. 113-117 = Cordi/locrimis and Marsujiiocrimis. 



Not ScHULZE, 1866; Echinod. Eifi. Kalk., p. di = Slortliini/ocrimis. 



Not Lyon, 1869; Amer. Pliilos. Soc. Vol. XIIL, p. ia<j = Hemcrims. 



Syn. Astropodia Ure, 1893, Hist, of Rutberglen. 



Syn. Niwe Encrinite Parkinson, 1811 ; Org. Rem., Vol. II. 



Syn. Encrinites (in part) Schlotheim, 1823; Naclitr. zur Petrefactenkunde. 



Syn. Centrocriims and Pleiirocriims Austin, 1843 ; Monogr. Crinoids, p. 6. 



Syn, Edwardsocrimts D'Orbigny, 1850, Prodrome, Vol. I., p. 156. 



Calyx oblong, globose or pj'ramidal ; 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. truncatulm from the Lower Burlington limestone, and P. eriensis from the Hamilton group, have 

 two well defined costals in every ray. 



