234 



THE CRINOIDEA CAMERATA OF NORTH AMERICA. 



1885, W. and Sp. ; Revision Pal^ocr., Part III., p. 99 ; and Proceed. Acad. Nat. Sci. Phila 



p. 321. 

 Syn. Rhodocritms De Kon. and Le Hon, 1853, Recher. Crin. Carb. Belg., p. 104; Roemer, 1855, 



Lethsea Geognost., p. 240; Pictet, 1857, Traite de Paleont., Vol. IV., p. 314; E. Billings, 1858, 



Canada Surv., Decade III., pp. 25 & 26 ; Dujardin and Hupe, 1862, Hist, natur. des Zoopliytes 



Echiuod., p. 123 ; Rofe, 1865, Geol. Magazine, No. 12, p. 247. 

 Syn. Goniasteroidocrinus Lyon and Casseday, 1859, Amer. Journ. Sci., Vol. XXVIII. , Ser. 2, p. 233; 



Meek and Worthen, 1869, Proceed. Acad. Nat. Sci. Phila., p. 73 ; S. A. Miller, 1877, Catal. 



Paleeoz. Poss., p. 80, and 1889, N. Am. Geol. and Palgeont., p. 249. 

 Syn. Trematocrims Hall, 1860, Suppl. Geol. Rep. Iowa, Vol. I., 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. Post. 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. Illinois, Vol. II., p. 217. 



JR/\ 



Pig. 11. 



Gilbertsocrinus. 



lb = infrabasals, b = basals, R = radials, I = costals, II = disticlials. III = palmars, A = arms, AO = arm 

 openings, ir = interradials, ibr = interbrachials, IRA = 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. 



