234 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
1885, W. and Sp.; Revision Palwocr., Part III., p. 99; and Proceed. Acad. Nat. Sci. Phila. 
p- 321. 
Syn. Rhodocrinus Dx Kon. and LE Hon, 1853, Recher. Crin. Carb. Belg., p. 104; Roemer, 1855, 
Lethza Geognost., p. 240; Pictet, 1857, Traité de Paléont., Vol. IV., p. 314; E. Billings, 1858, 
Canada Surv., Decade II., pp. 25 & 26; Dujardin and Hupé, 1862, Hist. natur. des Zoophytes 
Echinod., p. 123; Rofe, 1865, Geol. Magazine, No. 12, p. 247. 
Syn. Goniasteroidocrinus Lyon and Cassepay, 1859, Amer. Journ. Sci., Vol. XX VIIL, Ser. 2, p. 233; 
Meek and Worthen, 1869, Proceed. Acad. Nat. Sci. Phila., p. 73 ; S. A. Miller, 1877, Catal. 
Palwoz. Foss., p. 80, and 1889, N. Am. Geol. and Paleont., p. 249. 
Syn. Zrematocrinus Haut, 1860, Suppl. Geol. Rep. Iowa, Vol. 1., p.70,and Prelim. Notice of New 
Spec. of Crin., p. 9; Meek and Worthen, 1860, Proceed. Acad. Nat. Sci. Phila., p. 383; Hall, 
1861, Journ. Bost. Soc. Nat. Hist., Vol. VII., p. 325, and 1862, 24th Rep. N. Y. State Cab. 
Nat. Hist., p. 128; Meek and Worthen, 1866, Geol. Rep. Llinois, Vol. I1., p. 217. 
Fie. 11. — Gilbertsocrinus, 
lb = infrabasals, b = basals, R = radials, I =costals, II = distichals, II] = palmars, A= arms, AO = arm 
openings, ir =interradials, ibr = interbrachials, [RA = interradial appendages. 
Dorsal cup greatly exceeding the disk in size; the former elongate, more 
or less cylindrical ; the latter flat or low-hemispherical, its margin extended 
into ten tubular appendages, passing outward and downward. Plates smooth 
or radiated, nodose or spiniferous. 
